Shovelhead compression ratio

8. For engines with low compression (8.0 or less), grinds 1, 2 and 3 have big advantages. They will produce much more power and torque at low RPM. However with high compression pistons, pinging could be a problem. 9. If you have oversized valves, valve to valve clearances should be checked for .050 minimum clearance. 10.The larger compression ratio on the newer engines was still a serious problem, due to the low fuel quality and octane. With many Shovelhead owners having to turn towards aftermarket parts to keep the bike running properly, Harley-Davidson realized they would have to start developing a new engine.This is just the idea for a start of a build. this is all on a kickstart only bike. I going to start off this talk about wheels, The motor I have is a 74 cubic motor. so, 4" stroke with a bore of 3 7/16 = 74 cubic. 4" stroke with a bore of 3 1/2 = 78 cubic. 4 1/2 stroke with a bore of 3 1/2 = 80 cubic.With modification like this, it is quite possible for a Shovelhead engine to run with the EVO and Twin Cam engines. We hope you find the information helpful. Area to be Modified. Original Modification Description. Current parts. Compression Ratio. 9.5:1. 9.5:1. Pistons by JE, Wiseco or Keith Black. Make Model. Harley Davidson FXS 1200 Low Rider. Year. 1977 - 78. Engine. Four stroke, 45° V-Twin, OHV, 2 valves per cylinder. Capacity. 1207 cc / 73.5 cu-in. Bore x Stroke.Jun 30, 2004 · "Compression ratio is based on how the bike will be ridden and how much HP is desired," Deacon told me. "Use flat top pistons or J&E 30 degree entry pistons with S.T.D bathtub chamber heads." Here's a shot of the heavier Shovelhead valve on the right and the lighter stem larger Evolution face for better flow. Dec 13, 2017 · Which, amazingly enough, is one of the few things not hand-crafted by the OP. And before you knew it, the beastly Shovelhead chopper was alive! “I built the motor into an 86”, but have high compression (10.58 to 1) and dual plugged STD heads. Don’t like opening up stock Harley cases for bigger jugs. 1970 Shovel Head 74"This custom one of a kind bike completely rebuilt for SHOW &; RIDE.Motor was totally rebuilt by local bike shop. Compression ratio 8.5:1, Cam-Andrews AB, New oil pump, S/S E Carb.New Tranny-Revtech, 5 speed, Electric & kick start.Both rims have Gold plated ... The vertical axis represents the pressure ratio of the compressor. It is calculated by taking the absolute outlet pressure and dividing by the absolute inlet pressure. (Note, most gauges read in gauge pressure i.e. zero psi at atmospheric when it is actually around 14.7 or so psi.)Compression ratios were increased from 6.0:1 to 8.0:1 or more which caused more heat to be generated. The combination of the changes described above along with deep fins on the heads were all needed to enable the new engine to cope with the increased combustion heat.The larger compression ratio on the newer engines was still a serious problem, due to the low fuel quality and octane. With many Shovelhead owners having to turn towards aftermarket parts to keep the bike running properly, Harley-Davidson realized they would have to start developing a new engine.Cylinder Compression Tester: 954: Fuel Pump Access Retainer Remover 2008 - Present FL: 955: EFI Fuel Pressure Gauge Tool: 956: ... Evo Roller Rocker Arm Set 1.745 Ratio: 1732: JIMS Shovelhead Roller Rockers Ratio of 1.50: 1733: Cruise Drive Mega Nut: 1743: Rear Swing Arm Assembly Tool: 1745: Timken Bearing Simulator: 1746:Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. First, high-lift cams tend to have much sharper radii and larger lifter travel distances. This increases the rate of wear and causes other unwanted effects. Second, a higher rocker ratio helps the valve spring keep the lifter on the cam. For example, a 200-pound valve spring with a 1:1.25 ratio will give 250 pounds at the lifter, while a 200 ...#2 · May 26, 2006 Your compression is fine. The factory shop book calls for anything over 90psi with not more than 30psi beetween the two cyliders.I have a 79FXS that has been in the family since new with 28,000 mi and I get 110 psi from both jugs. T tractorhunter Premium Member Joined Dec 5, 2005 323 Posts Discussion Starter · #3 · May 26, 2006Comes with ignition MSO and a 6 month/6,000 mile limited warranty. ULTIMA SHOVELHEAD 96CI ENGINE FOR HARLEY-DAVIDSON. NATURAL FINISH WITH CHROME ACCENTS FEATURES: Black finish with chrome accents and ignition module. 625" bore. 625" stroke. Cast dome pistons. Compression ratio of 9.5:1. Camshaft: 0.450" Lift / Duration 256. Sep 08, 2020 · Ok, Compression testing: cyl one is 65 initial push and 143 psi Cylinder two initial push is 65 and 145 psi. This was tested on a warmed up engine. So my compression ratio is almost 10:1 (145/14.7=9.8) I just strobe timed is and going on a test ride. Static compression ratio is relevant, but actual cranking compression is a much more important spec, just experiment with different cams, same CR and do cranking compression tests, huge difference, depending on when the intake closes. The shovel always had very low compression, especially later 80 inch versions at 7.4:1.Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. Because of the inferior quality fuel and octane, the large compression ratio became a serious problem for shovelheads. It ended up in an engine knock, causing overheating, blown gaskets, and damage to the head bolts. Harley Davidson made continuous improvements in the shovelhead until the end of its production to keep it usable for production.May 25, 2006 · #2 · May 26, 2006 Your compression is fine. The factory shop book calls for anything over 90psi with not more than 30psi beetween the two cyliders.I have a 79FXS that has been in the family since new with 28,000 mi and I get 110 psi from both jugs. T tractorhunter Premium Member Joined Dec 5, 2005 323 Posts Discussion Starter · #3 · May 26, 2006 For 88 CID engines with stock compression ratio. Idle-4500 rpm. Bolt-in torque. 510: Designed as a bolt-in cam for 88, 95, and 96 CID engines with compression ratios below 9.7:1, it is primarily intended for use with stock, un-ported heads. 3000-5500 rpm. Bolt-in overall. 551: Designed for engines with 96 to 106 CID and 9:1 to 9:9 compression ...Then ya gotta figure in compression ratio. Gas is getting bad and hi-compression Shovels can have a meltdown in slow to stopped traffic. (Pans & Knucks too) Ya gotta really know what yer doing when mixing and matching factory vs aftermarket Shovelhead componants. Seen too many people , myself included , run into problems using the wrong parts.Harley Advanced Dynamic Compression Calculator. Inlet Runner Design and Torque Peak Calculator. Static Compression Ratio Calculator. Mach Index of Inlet Valves Calculator. Lovell Mean Gas Speed Inlet Valve Calculator. Tire Diameter Calculator. Fork Length and Trail Calculator. Rake and Trail Calculator. Professional Rake and Trail Calculator.Uses early FL style 3/32" thick compression rings; 8.5:1 CR ratio; Did you find this helpful? 1 of 1 Found Helpful. Reviewed by: Shirley Kim on 9/1/2020 / Did you find this helpful? Reviewed by: Valentina Small on 8/31/2018 / Did you find this helpful? Reviewed by: Ally Mora on 9/20/2017 /Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. If you want to take the formulas with you and put them in your tool box, here they are. 16.387 is a number than converts cubic inches to cc's. Displacement =. (Bore ÷ 2)2 x 3.14 x Stroke x 16.387. Head Gasket space =. (Bore ÷ 2)2 x 3.14 x Gasket thickness x 16.387064. Deck Height space =.Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. ... Shovelhead compression ratio. making my way downtown with a glock lyrics. when will the ...82-FLH Electra Glide: 80ci Shovelhead OHV V-twin with four-speed transmission. ... Thicker head gasket producing lower 8:1 compression ratio Larger rear disc Sep 08, 2020 · Ok, Compression testing: cyl one is 65 initial push and 143 psi Cylinder two initial push is 65 and 145 psi. This was tested on a warmed up engine. So my compression ratio is almost 10:1 (145/14.7=9.8) I just strobe timed is and going on a test ride. The compression ratio of the engine is one of three key factors in determining the engine's cylinder pressure. The other two are the duration of the camshaft (at .050" lifter rise) and the position of the cam in the engine (advanced or retarded). The result of how these three factors interact with one another is the amount of cylinder pressure ...Jul 16, 2022 · Re: Shovelhead compression ratio and pinging. November 15, 2019, 03:54:21 PM #1. When considering Static CR you need to factor in the camshaft timing and the result is called Dynamic CR. With a Shovel that has a stock camshaft the MoCo eventually went to 7.4:1 static CR so the engine would run on 87 octane. May 25, 2006 · #2 · May 26, 2006 Your compression is fine. The factory shop book calls for anything over 90psi with not more than 30psi beetween the two cyliders.I have a 79FXS that has been in the family since new with 28,000 mi and I get 110 psi from both jugs. T tractorhunter Premium Member Joined Dec 5, 2005 323 Posts Discussion Starter · #3 · May 26, 2006 I am running the 95ci with Forged High-Compression Pistons and the kompressor heads. with a 203 cam and perfect fit screaming eagle pushrods. it will be running at about 10.5:1 compression ratio. that seems fine to me but in the screaming eagle catalog it has a note at the bottom of the page that says "High-Compression Piston applications ...Those Dyno Guys, 5720 Lawton Drive, Sarasota, FL, 34233, United States 763-263-3966 [email protected] Nov 22, 2021 · SH93 engines feature forged pistons with a moderate compression ratio of 8.5:1 and a Super E carb. The SH93 is a good choice for daily riders, and is great for touring applications. Shovels 93H Engines. SH93H engines are an excellent choice to replace a tired shovelhead engine, and boost performance at the same time. Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S 暖気運転後、圧縮(リア側)を測定しました。11.5kg/cm2ありました。ピストンはワイセコハイコンプ9.5:1です。測定するとき ... Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. With modification like this, it is quite possible for a Shovelhead engine to run with the EVO and Twin Cam engines. We hope you find the information helpful. Area to be Modified. Original Modification Description. Current parts. Compression Ratio. 9.5:1. 9.5:1. Pistons by JE, Wiseco or Keith Black. May 25, 2006 · #2 · May 26, 2006 Your compression is fine. The factory shop book calls for anything over 90psi with not more than 30psi beetween the two cyliders.I have a 79FXS that has been in the family since new with 28,000 mi and I get 110 psi from both jugs. T tractorhunter Premium Member Joined Dec 5, 2005 323 Posts Discussion Starter · #3 · May 26, 2006 Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. ... Shovelhead compression ratio. making my way downtown with a glock lyrics. when will the ...Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&SStatic compression ratio is relevant, but actual cranking compression is a much more important spec, just experiment with different cams, same CR and do cranking compression tests, huge difference, depending on when the intake closes. The shovel always had very low compression, especially later 80 inch versions at 7.4:1.Shovelheads have a big, open, lazy chamber (but it's a HEMI!). So, they are subject to spark knock and detonation at relatively low compression ratios as compared to an automobile engine (or even a modern motorcycle motor). With decent premium fuel and careful tuning, you can run 9.5:1 in a street bike and be quite happy.Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. Learn why a motorcycle compression test is an important starting point to get a good view on the health of an engine.Because of the inferior quality fuel and octane, the large compression ratio became a serious problem for shovelheads. It ended up in an engine knock, causing overheating, blown gaskets, and damage to the head bolts. Harley Davidson made continuous improvements in the shovelhead until the end of its production to keep it usable for production.9,598 Your technique is correct. If your gauge is known good the bike may just have low static compression plus a bit of wear. I run low compression on my HDs because they start easier and tolerate shit gasoline. (If I wanted to race I'd own a performance motorcycle instead of dumping megabux into a tractor.)First, high-lift cams tend to have much sharper radii and larger lifter travel distances. This increases the rate of wear and causes other unwanted effects. Second, a higher rocker ratio helps the valve spring keep the lifter on the cam. For example, a 200-pound valve spring with a 1:1.25 ratio will give 250 pounds at the lifter, while a 200 ...The larger compression ratio on the newer engines was still a serious problem, due to the low fuel quality and octane. With many Shovelhead owners having to turn towards aftermarket parts to keep the bike running properly, Harley-Davidson realized they would have to start developing a new engine. [3] 8. For engines with low compression (8.0 or less), grinds 1, 2 and 3 have big advantages. They will produce much more power and torque at low RPM. However with high compression pistons, pinging could be a problem. 9. If you have oversized valves, valve to valve clearances should be checked for .050 minimum clearance. 10.Comes with ignition MSO and a 6 month/6,000 mile limited warranty. ULTIMA SHOVELHEAD 96CI ENGINE FOR HARLEY-DAVIDSON. NATURAL FINISH WITH CHROME ACCENTS FEATURES: Black finish with chrome accents and ignition module. 625" bore. 625" stroke. Cast dome pistons. Compression ratio of 9.5:1. Camshaft: 0.450" Lift / Duration 256. May 25, 2006 · #2 · May 26, 2006 Your compression is fine. The factory shop book calls for anything over 90psi with not more than 30psi beetween the two cyliders.I have a 79FXS that has been in the family since new with 28,000 mi and I get 110 psi from both jugs. T tractorhunter Premium Member Joined Dec 5, 2005 323 Posts Discussion Starter · #3 · May 26, 2006 Comes with ignition MSO and a 6 month/6,000 mile limited warranty. ULTIMA SHOVELHEAD 96CI ENGINE FOR HARLEY-DAVIDSON. NATURAL FINISH WITH CHROME ACCENTS FEATURES: Black finish with chrome accents and ignition module. 625" bore. 625" stroke. Cast dome pistons. Compression ratio of 9.5:1. Camshaft: 0.450" Lift / Duration 256. Aug 27, 2019 · Shovelheads have a big, open, lazy chamber (but it's a HEMI!). So, they are subject to spark knock and detonation at relatively low compression ratios as compared to an automobile engine (or even a modern motorcycle motor). With decent premium fuel and careful tuning, you can run 9.5:1 in a street bike and be quite happy. Since no compression builds until after the intake valve closes, it's the corrected compression ratio that gives the best indication of how pump gas friendly your motor will be. Premium pump gas in the U.S. will generally tolerate corrected compression ratios of somewhere between 8.8:1 and 9.3:1. Dec 20, 2015 · Quick kick on shovelhead compression test question. So I'm starting a winter hopefully top end only rebuild on my 77 shovel. I did what I think is a "proper" compression test. My results are kinda low, 75 on the front and about 100 on the rear. The bike leaks like a mother fucker but runs great. Your engine is 9.6-1 ratio doing the math it brings it out to 141 psi. The math: 1-1 = 14.7 psi... now the magic 2-1 = 29.4 psi... that is 2*14.7 = 29.4 psi. ... My Twin Cam service manual does not have compression values, but both my Evo and Shovelhead manuals say compression should be over 90 psi. @ operating temp., with less than 10% ... If you want to take the formulas with you and put them in your tool box, here they are. 16.387 is a number than converts cubic inches to cc's. Displacement =. (Bore ÷ 2)2 x 3.14 x Stroke x 16.387. Head Gasket space =. (Bore ÷ 2)2 x 3.14 x Gasket thickness x 16.387064. Deck Height space =.This is just the idea for a start of a build. this is all on a kickstart only bike. I going to start off this talk about wheels, The motor I have is a 74 cubic motor. so, 4" stroke with a bore of 3 7/16 = 74 cubic. 4" stroke with a bore of 3 1/2 = 78 cubic. 4 1/2 stroke with a bore of 3 1/2 = 80 cubic.The larger compression ratio on the newer engines was still a serious problem, due to the low fuel quality and octane. With many Shovelhead owners having to turn towards aftermarket parts to keep the bike running properly, Harley-Davidson realized they would have to start developing a new engine.Cylinder Compression Tester: 954: Fuel Pump Access Retainer Remover 2008 - Present FL: 955: EFI Fuel Pressure Gauge Tool: 956: ... Evo Roller Rocker Arm Set 1.745 Ratio: 1732: JIMS Shovelhead Roller Rockers Ratio of 1.50: 1733: Cruise Drive Mega Nut: 1743: Rear Swing Arm Assembly Tool: 1745: Timken Bearing Simulator: 1746:Stock compression ratio for early Harley-Davidson® panhead and shovelhead engines was 7.0:-1 to 7.5:1. Later model Evolution® engines are around 8.5:1. Modified engines for street use can have 9.0:-1 up to 10.5:1 compression ratio depending on the circumstances. Racing applications use 11.0:1 and higher compression. Because the quality of the Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. ... Shovelhead compression ratio. making my way downtown with a glock lyrics. when will the ...Feb 21, 2022 · Compression ratio is standard 8: 1. I came across a factory that produces complete heads for Shovelhead in which all the shortcomings of the stock head are eliminated and their head can use stock pistons, cylinders, and the compression ratio is 10.35: 1 of the calculated ratio. For 88 CID engines with stock compression ratio. Idle-4500 rpm. Bolt-in torque. 510: Designed as a bolt-in cam for 88, 95, and 96 CID engines with compression ratios below 9.7:1, it is primarily intended for use with stock, un-ported heads. 3000-5500 rpm. Bolt-in overall. 551: Designed for engines with 96 to 106 CID and 9:1 to 9:9 compression ...1200cc Evolution: 10:1. 103ci Twin Cam: 9.7:1. 1247cc Revolution: 11.5:1. Generally speaking, you should be safe to run 87 octane on a 103ci Twin Cam Harley because its compression ratio is less than 10:1. But with the 1200cc Evolution and the 1247cc Revolution, use high octane. So why does Harley-Davidson advise all of its fuel-injected ...Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S S&S Cycle Stock Bore Cylinder and Standard Compression Piston Kit for 1979-1984 Harley Shovelhead. Fits: 1979-1984 Harley Shovelhead. Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1; Compatible with stock or S&S cylinder headsIf the block has been decked I mill the intake a like amount for all material removed in excess of .025" from either the heads or the deck of the block. You can mill about .020" from the intake flange of the heads rather than the intake. This allows the heads to move from engine to engine with out the manifold having to mate with them. Regards ...Kawasaki 2008 Zx10r Ninja Running Motor Engine - Good Compression . Kawasaki 2008 Zx10r Ninja Running Motor Engine - Good Compression. Removed Off Of 2008 Zx10r Ninja. Notes Good Running Engine Showing Normal Wear. Runs Great! We Have Done A Dry Compression Test, And The Compression Is 185180185175. The Gauge On The Motorcycle Showed 17,406 Miles. Buy United Engine Machine KB927.005 at JEGS: United Engine Machine KB Forged Piston 1978-1984 H-D Shovelhead 80ci. Guaranteed lowest price! Save $20 Off $200, $50 Off $500, $100 Off $1000 Orders - Promo Code: SUMMER exclusions apply. Free Shipping over $99 Same Day Shipping before 9pm;If you want to take the formulas with you and put them in your tool box, here they are. 16.387 is a number than converts cubic inches to cc's. Displacement =. (Bore ÷ 2)2 x 3.14 x Stroke x 16.387. Head Gasket space =. (Bore ÷ 2)2 x 3.14 x Gasket thickness x 16.387064. Deck Height space =. Drag Specialties High Compression Piston - 3.487 in. Bore/8.5:1 Ratio - DS-750705 Keep the heart of your Harley pumping with these high-quality, cast aluminum pistons Big Twin 41-80 and Shovelhead 78-84 feature internal steel struts to control heat expansion and come in stock and low-compression versions for most Harley-Davidson models Therefore, the compression ratio is 10:1. A large included valve angle requires a high-dome piston, resulting in large piston-dome and chamber-surface areas. The Ironhead Sporty and Shovelhead engines have large hemi-like combustion chambers with high surface-to-volume ratios, which increase heat loss. Jul 16, 2022 · Re: Shovelhead compression ratio and pinging. November 15, 2019, 03:54:21 PM #1. When considering Static CR you need to factor in the camshaft timing and the result is called Dynamic CR. With a Shovel that has a stock camshaft the MoCo eventually went to 7.4:1 static CR so the engine would run on 87 octane. Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. The Harley-Davidson Shovelhead motor saw numerous changes over its 17 years in production. For the first three years, it ran a generator and kept the old kidney-shaped timing cover from the 1958-1965 Panhead. Shovelhead bikes built from 1966 to 1969 are sometimes referred to as a generator Shovel, flat-side Shovel, or Pan-Shovel.The vertical axis represents the pressure ratio of the compressor. It is calculated by taking the absolute outlet pressure and dividing by the absolute inlet pressure. (Note, most gauges read in gauge pressure i.e. zero psi at atmospheric when it is actually around 14.7 or so psi.)Your engine is 9.6-1 ratio doing the math it brings it out to 141 psi. The math: 1-1 = 14.7 psi... now the magic 2-1 = 29.4 psi... that is 2*14.7 = 29.4 psi. ... My Twin Cam service manual does not have compression values, but both my Evo and Shovelhead manuals say compression should be over 90 psi. @ operating temp., with less than 10% ...9,598 Your technique is correct. If your gauge is known good the bike may just have low static compression plus a bit of wear. I run low compression on my HDs because they start easier and tolerate shit gasoline. (If I wanted to race I'd own a performance motorcycle instead of dumping megabux into a tractor.)Comes with ignition MSO and a 6 month/6000 mile limited warranty. Ultima Shovelhead 96ci Engine for Harley-Davidson. Natural Finish with Chrome Accents features: Traditional finish with chrome accents and ignition module. 3.625" bore. 4.625" stroke. Cast dome pistons. Compression ratio of 9.5:1. Camshaft: 0.450" Lift / Duration 256. The Harley-Davidson Shovelhead motor saw numerous changes over its 17 years in production. For the first three years, it ran a generator and kept the old kidney-shaped timing cover from the 1958-1965 Panhead. Shovelhead bikes built from 1966 to 1969 are sometimes referred to as a generator Shovel, flat-side Shovel, or Pan-Shovel.82-FLH Electra Glide: 80ci Shovelhead OHV V-twin with four-speed transmission. ... Thicker head gasket producing lower 8:1 compression ratio Larger rear disc If you want to take the formulas with you and put them in your tool box, here they are. 16.387 is a number than converts cubic inches to cc's. Displacement =. (Bore ÷ 2)2 x 3.14 x Stroke x 16.387. Head Gasket space =. (Bore ÷ 2)2 x 3.14 x Gasket thickness x 16.387064. Deck Height space =. Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S Ignition timing is quite simple and the benefits to be gained are great... namely more power, longer engine life and better gas mileage. When combustion occurs it does not take place instantly. It requires a period of time. Depending on the RPM the power stroke can be .05 of a second at 1200 rpm to .0057 of a second at 10,500 rpm.Harley Advanced Dynamic Compression Calculator. Inlet Runner Design and Torque Peak Calculator. Static Compression Ratio Calculator. Mach Index of Inlet Valves Calculator. Lovell Mean Gas Speed Inlet Valve Calculator. Tire Diameter Calculator. Fork Length and Trail Calculator. Rake and Trail Calculator. Professional Rake and Trail Calculator.models and specs Harley Davidson panhead motorcycles general specifications 1948-1965. Horsepower. Torque. Compression ratios. Model designations.LATE STYLE CAM RECOMMENDATIONS FOR PANHEAD AND SHOVELHEAD ENGINES Application RPM range Compression Ratio If you used… Then Use. Generator. Alternator. 74"-Stock 84" low compression. 106-6028 106-6027. Low - Mid 1500-4500 rpm 8.5 and below. S&S® 450 or Andrews® J or A. S&S® 513. 33-5131 33-5109 33-5131 33-5109 33-5132 33-5058. 74" and ...Ignition timing is quite simple and the benefits to be gained are great... namely more power, longer engine life and better gas mileage. When combustion occurs it does not take place instantly. It requires a period of time. Depending on the RPM the power stroke can be .05 of a second at 1200 rpm to .0057 of a second at 10,500 rpm.Feb 21, 2022 · Compression ratio is standard 8: 1. I came across a factory that produces complete heads for Shovelhead in which all the shortcomings of the stock head are eliminated and their head can use stock pistons, cylinders, and the compression ratio is 10.35: 1 of the calculated ratio. Comes with ignition MSO and a 6 month/6,000 mile limited warranty. ULTIMA SHOVELHEAD 96CI ENGINE FOR HARLEY-DAVIDSON. NATURAL FINISH WITH CHROME ACCENTS FEATURES: Black finish with chrome accents and ignition module. 625" bore. 625" stroke. Cast dome pistons. Compression ratio of 9.5:1. Camshaft: 0.450" Lift / Duration 256. • Due to the displacement and compression ratio, an S&S Super ‘G’ carb and S&S dual-plugged heads come as standard equipment • The 103 is only offered in 1970-84 Alternator style, and comes with the S&S Super Stock Ignition System Uses early FL style 3/32" thick compression rings; 8.5:1 CR ratio; Did you find this helpful? 1 of 1 Found Helpful. Reviewed by: Shirley Kim on 9/1/2020 / Did you find this helpful? Reviewed by: Valentina Small on 8/31/2018 / Did you find this helpful? Reviewed by: Ally Mora on 9/20/2017 /A high compression ratio (above 9:1) and/or a short duration (when the valves are kept open a shorter amount of time) can compress the mixture enough to make it explode rather than burn. Normal combustion is not an explosive process. Dual plugging a shovelhead combustion chamber is a smart idea Using a second plug reduces the distance between a plug and the farthest part of the combustion chamber. ... This enables you to run a higher compression ratio if using the same fuel OR run a lower octane fuel if keeping the same compression.Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. ... Shovelhead compression ratio. making my way downtown with a glock lyrics. when will the ...May 25, 2006 · #2 · May 26, 2006 Your compression is fine. The factory shop book calls for anything over 90psi with not more than 30psi beetween the two cyliders.I have a 79FXS that has been in the family since new with 28,000 mi and I get 110 psi from both jugs. T tractorhunter Premium Member Joined Dec 5, 2005 323 Posts Discussion Starter · #3 · May 26, 2006 The vertical axis represents the pressure ratio of the compressor. It is calculated by taking the absolute outlet pressure and dividing by the absolute inlet pressure. (Note, most gauges read in gauge pressure i.e. zero psi at atmospheric when it is actually around 14.7 or so psi.)Jul 16, 2022 · Re: Shovelhead compression ratio and pinging. November 15, 2019, 03:54:21 PM #1. When considering Static CR you need to factor in the camshaft timing and the result is called Dynamic CR. With a Shovel that has a stock camshaft the MoCo eventually went to 7.4:1 static CR so the engine would run on 87 octane. The V/P Index is 48. Let's compare this with a hot U-Series motor: 4-3/4" stroker for 88" , and delay (increase) the intake closing to 65°. Compression is about 6.25:1 with the same combustion chamber volume. The effective stroke is 3.677" , and an effective volume of 68.3" . The effective compression ratio is 5.06:1.With modification like this, it is quite possible for a Shovelhead engine to run with the EVO and Twin Cam engines. We hope you find the information helpful. Area to be Modified. Original Modification Description. Current parts. Compression Ratio. 9.5:1. 9.5:1. Pistons by JE, Wiseco or Keith Black. Compression ratios were increased from 6.0:1 to 8.0:1 or more which caused more heat to be generated. The combination of the changes described above along with deep fins on the heads were all needed to enable the new engine to cope with the increased combustion heat.With a Shovel that has a stock camshaft the MoCo eventually went to 7.4:1 static CR so the engine would run on 87 octane. The more radical the camshaft the higher the static CR needs to be to have a reasonable dynamic CR. The DM500 cam you're going to use is meant for a Evo, right?40/08 106 228 264 .498 .121 heavy bikes, stock compression ratios and pistons. Similar to #23 cam for EV 80. (1700-4800 RPM) 216326 26H 11/35 102 226 262 .490 .138 Stock Bolt-in cam 96-103 inches and stock compression ratio. 41/09 106 230 266 .490 .120 Great for two-up touring, this cam will add torque and HPEngine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. Shovelhead 86 cubic inches Stock Bore: 3.437 Stock Stroke: 4.500 Compression Ratio 9.5:1. Part # Bore Stroke C/H Comp Ratio Dome CC’s Rings Pins Locks; M5052: 3.498 ... Find many great new & used options and get the best deals for Harley 8.5 Compression Ratio Piston Shovelhead Panhead Knucklehead 74 1200 FLH at the best online prices at eBay! Free shipping for many products! Shovelhead compression specs. Modify existing air cleaner filter back. persona 3 portable 60 fps patch; octastream channels list; undertale harem x reader ... The vertical axis represents the pressure ratio of the compressor. It is calculated by taking the absolute outlet pressure and dividing by the absolute inlet pressure. (Note, most gauges read in gauge pressure i.e. zero psi at atmospheric when it is actually around 14.7 or so psi.)Make Model. Harley Davidson FXS 1200 Low Rider. Year. 1977 - 78. Engine. Four stroke, 45° V-Twin, OHV, 2 valves per cylinder. Capacity. 1207 cc / 73.5 cu-in. Bore x Stroke.#2 · May 26, 2006 Your compression is fine. The factory shop book calls for anything over 90psi with not more than 30psi beetween the two cyliders.I have a 79FXS that has been in the family since new with 28,000 mi and I get 110 psi from both jugs. T tractorhunter Premium Member Joined Dec 5, 2005 323 Posts Discussion Starter · #3 · May 26, 2006S&S Cycle Stock Bore Cylinder and Standard Compression Piston Kit for 1979-1984 Harley Shovelhead. Fits: 1979-1984 Harley Shovelhead. Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1; Compatible with stock or S&S cylinder headsIntended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S Kawasaki 2008 Zx10r Ninja Running Motor Engine - Good Compression . Kawasaki 2008 Zx10r Ninja Running Motor Engine - Good Compression. Removed Off Of 2008 Zx10r Ninja. Notes Good Running Engine Showing Normal Wear. Runs Great! We Have Done A Dry Compression Test, And The Compression Is 185180185175. The Gauge On The Motorcycle Showed 17,406 Miles.Feb 02, 2016 · Static compression ratio is relevant, but actual cranking compression is a much more important spec, just experiment with different cams, same CR and do cranking compression tests, huge difference, depending on when the intake closes. The shovel always had very low compression, especially later 80 inch versions at 7.4:1. Uses early FL style 3/32" thick compression rings; 8.5:1 CR ratio; Did you find this helpful? 1 of 1 Found Helpful. Reviewed by: Shirley Kim on 9/1/2020 / Did you find this helpful? Reviewed by: Valentina Small on 8/31/2018 / Did you find this helpful? Reviewed by: Ally Mora on 9/20/2017 /Sep 08, 2020 · Ok, Compression testing: cyl one is 65 initial push and 143 psi Cylinder two initial push is 65 and 145 psi. This was tested on a warmed up engine. So my compression ratio is almost 10:1 (145/14.7=9.8) I just strobe timed is and going on a test ride. Jul 16, 2022 · Re: Shovelhead compression ratio and pinging. November 15, 2019, 03:54:21 PM #1. When considering Static CR you need to factor in the camshaft timing and the result is called Dynamic CR. With a Shovel that has a stock camshaft the MoCo eventually went to 7.4:1 static CR so the engine would run on 87 octane. Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. The compression ratio of the engine is one of three key factors in determining the engine's cylinder pressure. The other two are the duration of the camshaft (at .050" lifter rise) and the position of the cam in the engine (advanced or retarded). The result of how these three factors interact with one another is the amount of cylinder pressure ...When the engine is assembled, use one of the .030 inch thickness head gaskets instead of the normal .040 or .060 inch gaskets. This will give the engine a mechanical compression ratio of almost 9.5:1. This is considered the minimum compression ratio needed to make serious power from a Harley-Davidson engine. Change to a domed piston.The Harley-Davidson Shovelhead V-twin was introduced in 1966. Here's a look at the technical evolution of the 74-cu.-in. engine and chassis of Harley-Davidson's long-running OHV Big Twin.For 88 CID engines with stock compression ratio. Idle-4500 rpm. Bolt-in torque. 510: Designed as a bolt-in cam for 88, 95, and 96 CID engines with compression ratios below 9.7:1, it is primarily intended for use with stock, un-ported heads. 3000-5500 rpm. Bolt-in overall. 551: Designed for engines with 96 to 106 CID and 9:1 to 9:9 compression ...Buy United Engine Machine KB927.005 at JEGS: United Engine Machine KB Forged Piston 1978-1984 H-D Shovelhead 80ci. Guaranteed lowest price! Save $20 Off $200, $50 Off $500, $100 Off $1000 Orders - Promo Code: SUMMER exclusions apply. Free Shipping over $99 Same Day Shipping before 9pm;The Harley-Davidson Shovelhead motor saw numerous changes over its 17 years in production. For the first three years, it ran a generator and kept the old kidney-shaped timing cover from the 1958-1965 Panhead. Shovelhead bikes built from 1966 to 1969 are sometimes referred to as a generator Shovel, flat-side Shovel, or Pan-Shovel.Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S Shovelhead 86 cubic inches Stock Bore: 3.437 Stock Stroke: 4.500 Compression Ratio 9.5:1. Part # Bore Stroke C/H Comp Ratio Dome CC’s Rings Pins Locks; M5052: 3.498 ... Find many great new & used options and get the best deals for Harley 8.5 Compression Ratio Piston Shovelhead Panhead Knucklehead 74 1200 FLH at the best online prices at eBay! Free shipping for many products! Kawasaki 2008 Zx10r Ninja Running Motor Engine - Good Compression . Kawasaki 2008 Zx10r Ninja Running Motor Engine - Good Compression. Removed Off Of 2008 Zx10r Ninja. Notes Good Running Engine Showing Normal Wear. Runs Great! We Have Done A Dry Compression Test, And The Compression Is 185180185175. The Gauge On The Motorcycle Showed 17,406 Miles.Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. With modification like this, it is quite possible for a Shovelhead engine to run with the EVO and Twin Cam engines. We hope you find the information helpful. Area to be Modified. Original Modification Description. Current parts. Compression Ratio. 9.5:1. 9.5:1. Pistons by JE, Wiseco or Keith Black. Feb 24, 2009 · For the Ironhead XL and Shovelhead, expect 9:1 to 10:1 as the maximum mechanical compression ratio on pump gas. Fuel-injected models may work well with up to a half point higher mechanical compression than the values listed above. Fits: All Harley-Davidson Shovelhead engines 1978-1984 ; 80 cubic inch (1340 cubic capacity) kit includes 9.5:1 compression ratio domed pistons, rings, circlips, chrome piston pins ; Each Wiseco piston is designed with the proper installed clearance to produce the most power, least wear, and best seal at running temperature, for each application The Harley-Davidson Shovelhead motor saw numerous changes over its 17 years in production. For the first three years, it ran a generator and kept the old kidney-shaped timing cover from the 1958-1965 Panhead. Shovelhead bikes built from 1966 to 1969 are sometimes referred to as a generator Shovel, flat-side Shovel, or Pan-Shovel. 40/08 106 228 264 .498 .121 heavy bikes, stock compression ratios and pistons. Similar to #23 cam for EV 80. (1700-4800 RPM) 216326 26H 11/35 102 226 262 .490 .138 Stock Bolt-in cam 96-103 inches and stock compression ratio. 41/09 106 230 266 .490 .120 Great for two-up touring, this cam will add torque and HPDrag Specialties High Compression Piston - 3.487 in. Bore/8.5:1 Ratio - DS-750705 Keep the heart of your Harley pumping with these high-quality, cast aluminum pistons Big Twin 41-80 and Shovelhead 78-84 feature internal steel struts to control heat expansion and come in stock and low-compression versions for most Harley-Davidson models 暖気運転後、圧縮(リア側)を測定しました。11.5kg/cm2ありました。ピストンはワイセコハイコンプ9.5:1です。測定するとき ... Feb 02, 2016 · Static compression ratio is relevant, but actual cranking compression is a much more important spec, just experiment with different cams, same CR and do cranking compression tests, huge difference, depending on when the intake closes. The shovel always had very low compression, especially later 80 inch versions at 7.4:1. 40/08 106 228 264 .498 .121 heavy bikes, stock compression ratios and pistons. Similar to #23 cam for EV 80. (1700-4800 RPM) 216326 26H 11/35 102 226 262 .490 .138 Stock Bolt-in cam 96-103 inches and stock compression ratio. 41/09 106 230 266 .490 .120 Great for two-up touring, this cam will add torque and HPIntended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S Feb 26, 2011 · Then ya gotta figure in compression ratio. Gas is getting bad and hi-compression Shovels can have a meltdown in slow to stopped traffic. (Pans & Knucks too) Ya gotta really know what yer doing when mixing and matching factory vs aftermarket Shovelhead componants. Seen too many people , myself included , run into problems using the wrong parts. The following information for building a high performance Shovelhead engine was discovered in the archives of a Harley-Davidson dealership. The list of modifications has been attributed to the HD Engineering Group responsible for XR-750 development in the late 70's or early 80's. ... Compression Ratio: 9.5:1: 9.5:1 Pistons by JE, Wiseco or ...The Harley-Davidson Shovelhead motor saw numerous changes over its 17 years in production. For the first three years, it ran a generator and kept the old kidney-shaped timing cover from the 1958-1965 Panhead. Shovelhead bikes built from 1966 to 1969 are sometimes referred to as a generator Shovel, flat-side Shovel, or Pan-Shovel. Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S Side-Valve Compression Ratio Increase vs. Power: Jan. 14, 2005 The Otto Cycle: Compression Ratio vs. Efficiency: ... Shovelhead 1972-81: Sportster 1957-* 45 WL, trike Dec 13, 2017 · Which, amazingly enough, is one of the few things not hand-crafted by the OP. And before you knew it, the beastly Shovelhead chopper was alive! “I built the motor into an 86”, but have high compression (10.58 to 1) and dual plugged STD heads. Don’t like opening up stock Harley cases for bigger jugs. Shovelhead 86 cubic inches Stock Bore: 3.437 Stock Stroke: 4.500 Compression Ratio 9.5:1. Part # Bore Stroke C/H Comp Ratio Dome CC’s Rings Pins Locks; M5052: 3.498 ... 16. 5. G'day again fella's. Having only just bought this bike I was wondering if someone can tell me what the compression should be on a 1340 Evo. I have a workshop manual from when I had my 1993 Springer which I am now using for my '88 Springer. The manual claims it should have 90 PSI. I thought that was pretty low.• Due to the displacement and compression ratio, an S&S Super ‘G’ carb and S&S dual-plugged heads come as standard equipment • The 103 is only offered in 1970-84 Alternator style, and comes with the S&S Super Stock Ignition System These bikes will have a normal compression pressure that is quite low, because of the Compression Release. For example, the Kawasaki KLX650A should read 50-85 PSI. Kawasaki KLX650C is 57-87 PSI. Honda XR650R is 87 PSI with decompressor applied and 160 PSI with decompressor not applied.The dealer put in a high output starter and added compression releases to the SE heads (had plugged holes to install them). A press of each of the compression releases and the engine spins like a top and fires up. For any high compression engine, I would recommend them. With the holes in the heads type they are around $45. Cheap and effective.Buy United Engine Machine KB927.005 at JEGS: United Engine Machine KB Forged Piston 1978-1984 H-D Shovelhead 80ci. Guaranteed lowest price! Save $20 Off $200, $50 Off $500, $100 Off $1000 Orders - Promo Code: SUMMER exclusions apply. Free Shipping over $99 Same Day Shipping before 9pm;Those Dyno Guys, 5720 Lawton Drive, Sarasota, FL, 34233, United States 763-263-3966 [email protected] If you want to take the formulas with you and put them in your tool box, here they are. 16.387 is a number than converts cubic inches to cc's. Displacement =. (Bore ÷ 2)2 x 3.14 x Stroke x 16.387. Head Gasket space =. (Bore ÷ 2)2 x 3.14 x Gasket thickness x 16.387064. Deck Height space =. With a Shovel that has a stock camshaft the MoCo eventually went to 7.4:1 static CR so the engine would run on 87 octane. The more radical the camshaft the higher the static CR needs to be to have a reasonable dynamic CR. The DM500 cam you're going to use is meant for a Evo, right?Cylinder Compression Tester: 954: Fuel Pump Access Retainer Remover 2008 - Present FL: 955: EFI Fuel Pressure Gauge Tool: 956: ... Evo Roller Rocker Arm Set 1.745 Ratio: 1732: JIMS Shovelhead Roller Rockers Ratio of 1.50: 1733: Cruise Drive Mega Nut: 1743: Rear Swing Arm Assembly Tool: 1745: Timken Bearing Simulator: 1746:If you want to take the formulas with you and put them in your tool box, here they are. 16.387 is a number than converts cubic inches to cc's. Displacement =. (Bore ÷ 2)2 x 3.14 x Stroke x 16.387. Head Gasket space =. (Bore ÷ 2)2 x 3.14 x Gasket thickness x 16.387064. Deck Height space =. Feb 24, 2009 · For the Ironhead XL and Shovelhead, expect 9:1 to 10:1 as the maximum mechanical compression ratio on pump gas. Fuel-injected models may work well with up to a half point higher mechanical compression than the values listed above. Comes with ignition MSO and a 6 month/6000 mile limited warranty. Ultima Shovelhead 96ci Engine for Harley-Davidson. Natural Finish with Chrome Accents features: Traditional finish with chrome accents and ignition module. 3.625" bore. 4.625" stroke. Cast dome pistons. Compression ratio of 9.5:1. Camshaft: 0.450" Lift / Duration 256. S&S ® Low Compression Forged Stock Bore Stoker Pistons For 1936-'84 HD ® Big Twins - 3-7/16" Standard Bore. $567.95.Since no compression builds until after the intake valve closes, it's the corrected compression ratio that gives the best indication of how pump gas friendly your motor will be. Premium pump gas in the U.S. will generally tolerate corrected compression ratios of somewhere between 8.8:1 and 9.3:1. Shovelhead 86 cubic inches Stock Bore: 3.437 Stock Stroke: 4.500 Compression Ratio 9.5:1. Part # Bore Stroke C/H Comp Ratio Dome CC’s Rings Pins Locks; M5052: 3.498 ... models and specs Harley Davidson panhead motorcycles general specifications 1948-1965. Horsepower. Torque. Compression ratios. Model designations.Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S LATE STYLE CAM RECOMMENDATIONS FOR PANHEAD AND SHOVELHEAD ENGINES Application RPM range Compression Ratio If you used… Then Use. Generator. Alternator. 74"-Stock 84" low compression. 106-6028 106-6027. Low - Mid 1500-4500 rpm 8.5 and below. S&S® 450 or Andrews® J or A. S&S® 513. 33-5131 33-5109 33-5131 33-5109 33-5132 33-5058. 74" and ...The compression ratio of the engine is one of three key factors in determining the engine's cylinder pressure. The other two are the duration of the camshaft (at .050" lifter rise) and the position of the cam in the engine (advanced or retarded). The result of how these three factors interact with one another is the amount of cylinder pressure ...The Harley-Davidson Shovelhead motor saw numerous changes over its 17 years in production. For the first three years, it ran a generator and kept the old kidney-shaped timing cover from the 1958-1965 Panhead. Shovelhead bikes built from 1966 to 1969 are sometimes referred to as a generator Shovel, flat-side Shovel, or Pan-Shovel. Jun 30, 2004 · "Compression ratio is based on how the bike will be ridden and how much HP is desired," Deacon told me. "Use flat top pistons or J&E 30 degree entry pistons with S.T.D bathtub chamber heads." Here's a shot of the heavier Shovelhead valve on the right and the lighter stem larger Evolution face for better flow. Side-Valve Compression Ratio Increase vs. Power: Jan. 14, 2005 The Otto Cycle: Compression Ratio vs. Efficiency: ... Shovelhead 1972-81: Sportster 1957-* 45 WL, trike Drag Specialties High Compression Piston - 3.487 in. Bore/8.5:1 Ratio - DS-750705 Keep the heart of your Harley pumping with these high-quality, cast aluminum pistons Big Twin 41-80 and Shovelhead 78-84 feature internal steel struts to control heat expansion and come in stock and low-compression versions for most Harley-Davidson models The Harley-Davidson Shovelhead V-twin was introduced in 1966. Here's a look at the technical evolution of the 74-cu.-in. engine and chassis of Harley-Davidson's long-running OHV Big Twin.The larger compression ratio on the newer engines was still a serious problem, due to the low fuel quality and octane. With many Shovelhead owners having to turn towards aftermarket parts to keep the bike running properly, Harley-Davidson realized they would have to start developing a new engine. [3] A high compression ratio (above 9:1) and/or a short duration (when the valves are kept open a shorter amount of time) can compress the mixture enough to make it explode rather than burn. Normal combustion is not an explosive process. Comes with ignition MSO and a 6 month/6000 mile limited warranty. Ultima Shovelhead 96ci Engine for Harley-Davidson. Natural Finish with Chrome Accents features: Traditional finish with chrome accents and ignition module. 3.625" bore. 4.625" stroke. Cast dome pistons. Compression ratio of 9.5:1. Camshaft: 0.450" Lift / Duration 256. Feb 26, 2011 · Then ya gotta figure in compression ratio. Gas is getting bad and hi-compression Shovels can have a meltdown in slow to stopped traffic. (Pans & Knucks too) Ya gotta really know what yer doing when mixing and matching factory vs aftermarket Shovelhead componants. Seen too many people , myself included , run into problems using the wrong parts. Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S 1200cc Evolution: 10:1. 103ci Twin Cam: 9.7:1. 1247cc Revolution: 11.5:1. Generally speaking, you should be safe to run 87 octane on a 103ci Twin Cam Harley because its compression ratio is less than 10:1. But with the 1200cc Evolution and the 1247cc Revolution, use high octane. So why does Harley-Davidson advise all of its fuel-injected ...Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&SIntended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S Apr 11, 2018 · I still have my '79 FXEF (80") and I was wondering if I had an oddball. (9.4:1 comp) Good for you! That was one of my favorites. That compression ratio is higher than stock, but there is nothing wrong with it, they tend to run great on decent gasoline, especially with high-overlap cams. I am running the 95ci with Forged High-Compression Pistons and the kompressor heads. with a 203 cam and perfect fit screaming eagle pushrods. it will be running at about 10.5:1 compression ratio. that seems fine to me but in the screaming eagle catalog it has a note at the bottom of the page that says "High-Compression Piston applications ...But once some good octane fuel is being used, power that could be made isnt because of the lower compression ratio. izan. Nov 29, 2004 #10 bfdahl. Proven Member. 348 4 Dec 26, 2003 los angeles, California. ekanddsm said: I have a 91 tsi awd that I bought from a friend and I was wonderin.But once some good octane fuel is being used, power that could be made isnt because of the lower compression ratio. izan. Nov 29, 2004 #10 bfdahl. Proven Member. 348 4 Dec 26, 2003 los angeles, California. ekanddsm said: I have a 91 tsi awd that I bought from a friend and I was wonderin.S&S ® Low Compression Forged Stock Bore Stoker Pistons For 1936-'84 HD ® Big Twins - 3-7/16" Standard Bore. $567.95.Those Dyno Guys, 5720 Lawton Drive, Sarasota, FL, 34233, United States 763-263-3966 [email protected] engine is 9.6-1 ratio doing the math it brings it out to 141 psi. The math: 1-1 = 14.7 psi... now the magic 2-1 = 29.4 psi... that is 2*14.7 = 29.4 psi. ... My Twin Cam service manual does not have compression values, but both my Evo and Shovelhead manuals say compression should be over 90 psi. @ operating temp., with less than 10% ...Those Dyno Guys, 5720 Lawton Drive, Sarasota, FL, 34233, United States 763-263-3966 [email protected]暖気運転後、圧縮(リア側)を測定しました。11.5kg/cm2ありました。ピストンはワイセコハイコンプ9.5:1です。測定するとき ...Stock compression ratio for early Harley-Davidson® panhead and shovelhead engines was 7.0:-1 to 7.5:1. Later model Evolution® engines are around 8.5:1. Modified engines for street use can have 9.0:-1 up to 10.5:1 compression ratio depending on the circumstances. Racing applications use 11.0:1 and higher compression. Because the quality of the Shovelhead 86 cubic inches Stock Bore: 3.437 Stock Stroke: 4.500 Compression Ratio 9.5:1. Part # Bore Stroke C/H Comp Ratio Dome CC’s Rings Pins Locks; M5052: 3.498 ... Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S Comes with ignition MSO and a 6 month/6000 mile limited warranty. Ultima Shovelhead 96ci Engine for Harley-Davidson. Natural Finish with Chrome Accents features: Traditional finish with chrome accents and ignition module. 3.625" bore. 4.625" stroke. Cast dome pistons. Compression ratio of 9.5:1. Camshaft: 0.450" Lift / Duration 256. Comes with ignition MSO and a 6 month/6000 mile limited warranty. Ultima Shovelhead 96ci Engine for Harley-Davidson. Natural Finish with Chrome Accents features: Traditional finish with chrome accents and ignition module. 3.625" bore. 4.625" stroke. Cast dome pistons. Compression ratio of 9.5:1. Camshaft: 0.450" Lift / Duration 256. Aug 27, 2019 · Shovelheads have a big, open, lazy chamber (but it's a HEMI!). So, they are subject to spark knock and detonation at relatively low compression ratios as compared to an automobile engine (or even a modern motorcycle motor). With decent premium fuel and careful tuning, you can run 9.5:1 in a street bike and be quite happy. The vertical axis represents the pressure ratio of the compressor. It is calculated by taking the absolute outlet pressure and dividing by the absolute inlet pressure. (Note, most gauges read in gauge pressure i.e. zero psi at atmospheric when it is actually around 14.7 or so psi.)Feb 26, 2011 · Then ya gotta figure in compression ratio. Gas is getting bad and hi-compression Shovels can have a meltdown in slow to stopped traffic. (Pans & Knucks too) Ya gotta really know what yer doing when mixing and matching factory vs aftermarket Shovelhead componants. Seen too many people , myself included , run into problems using the wrong parts. Since no compression builds until after the intake valve closes, it's the corrected compression ratio that gives the best indication of how pump gas friendly your motor will be. Premium pump gas in the U.S. will generally tolerate corrected compression ratios of somewhere between 8.8:1 and 9.3:1. 82-FLH Electra Glide: 80ci Shovelhead OHV V-twin with four-speed transmission. ... Thicker head gasket producing lower 8:1 compression ratio Larger rear disc Comes with ignition MSO and a 6 month/6,000 mile limited warranty. ULTIMA SHOVELHEAD 96CI ENGINE FOR HARLEY-DAVIDSON. NATURAL FINISH WITH CHROME ACCENTS FEATURES: Black finish with chrome accents and ignition module. 625" bore. 625" stroke. Cast dome pistons. Compression ratio of 9.5:1. Camshaft: 0.450" Lift / Duration 256. Kawasaki 2008 Zx10r Ninja Running Motor Engine - Good Compression . Kawasaki 2008 Zx10r Ninja Running Motor Engine - Good Compression. Removed Off Of 2008 Zx10r Ninja. Notes Good Running Engine Showing Normal Wear. Runs Great! We Have Done A Dry Compression Test, And The Compression Is 185180185175. The Gauge On The Motorcycle Showed 17,406 Miles. Because of the inferior quality fuel and octane, the large compression ratio became a serious problem for shovelheads. It ended up in an engine knock, causing overheating, blown gaskets, and damage to the head bolts. Harley Davidson made continuous improvements in the shovelhead until the end of its production to keep it usable for production.Both numbers are determined in single-cylinder, variable-compression-ratio engines. The first is the research octane number (RON), where operating conditions are mild. This is the number that gas stations in the 1960s put on their advertising signs out in front, numbers that ranged from a little over 100 to as high as 104. If an engine is ...81-FLT Tour-Glide: 80ci Shovelhead OHV V-twin with five-speed transmission ... Reduced compression ratio to 7.4:1 Longer valve guides Nov 22, 2021 · SH93 engines feature forged pistons with a moderate compression ratio of 8.5:1 and a Super E carb. The SH93 is a good choice for daily riders, and is great for touring applications. Shovels 93H Engines. SH93H engines are an excellent choice to replace a tired shovelhead engine, and boost performance at the same time. If the block has been decked I mill the intake a like amount for all material removed in excess of .025" from either the heads or the deck of the block. You can mill about .020" from the intake flange of the heads rather than the intake. This allows the heads to move from engine to engine with out the manifold having to mate with them. Regards ...The larger compression ratio on the newer engines was still a serious problem, due to the low fuel quality and octane. With many Shovelhead owners having to turn towards aftermarket parts to keep the bike running properly, Harley-Davidson realized they would have to start developing a new engine.1200cc Evolution: 10:1. 103ci Twin Cam: 9.7:1. 1247cc Revolution: 11.5:1. Generally speaking, you should be safe to run 87 octane on a 103ci Twin Cam Harley because its compression ratio is less than 10:1. But with the 1200cc Evolution and the 1247cc Revolution, use high octane. So why does Harley-Davidson advise all of its fuel-injected ...40/08 106 228 264 .498 .121 heavy bikes, stock compression ratios and pistons. Similar to #23 cam for EV 80. (1700-4800 RPM) 216326 26H 11/35 102 226 262 .490 .138 Stock Bolt-in cam 96-103 inches and stock compression ratio. 41/09 106 230 266 .490 .120 Great for two-up touring, this cam will add torque and HPIntended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. ... Shovelhead compression ratio. making my way downtown with a glock lyrics. when will the ...Compression ratios were increased from 6.0:1 to 8.0:1 or more which caused more heat to be generated. The combination of the changes described above along with deep fins on the heads were all needed to enable the new engine to cope with the increased combustion heat.models and specs Harley Davidson panhead motorcycles general specifications 1948-1965. Horsepower. Torque. Compression ratios. Model designations.The V/P Index is 48. Let's compare this with a hot U-Series motor: 4-3/4" stroker for 88" , and delay (increase) the intake closing to 65°. Compression is about 6.25:1 with the same combustion chamber volume. The effective stroke is 3.677" , and an effective volume of 68.3" . The effective compression ratio is 5.06:1.• Due to the displacement and compression ratio, an S&S Super ‘G’ carb and S&S dual-plugged heads come as standard equipment • The 103 is only offered in 1970-84 Alternator style, and comes with the S&S Super Stock Ignition System A high compression ratio (above 9:1) and/or a short duration (when the valves are kept open a shorter amount of time) can compress the mixture enough to make it explode rather than burn. Normal combustion is not an explosive process. 82-FLH Electra Glide: 80ci Shovelhead OHV V-twin with four-speed transmission. ... Thicker head gasket producing lower 8:1 compression ratio Larger rear disc The Harley-Davidson Shovelhead V-twin was introduced in 1966. Here's a look at the technical evolution of the 74-cu.-in. engine and chassis of Harley-Davidson's long-running OHV Big Twin.Ignition timing is quite simple and the benefits to be gained are great... namely more power, longer engine life and better gas mileage. When combustion occurs it does not take place instantly. It requires a period of time. Depending on the RPM the power stroke can be .05 of a second at 1200 rpm to .0057 of a second at 10,500 rpm.Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. Rocker boxes replaced the valve covers and the visual similarity to coal shovels earned the new bike the name “Shovelhead.” A Linkert carburetor fed the bike with a compression ratio of 8:1 and the engine was mated with a 4-speed transmission with chain for the primary and final drives. These engines were available in FL models. The larger compression ratio on the newer engines was still a serious problem, due to the low fuel quality and octane. With many Shovelhead owners having to turn towards aftermarket parts to keep the bike running properly, Harley-Davidson realized they would have to start developing a new engine.The vertical axis represents the pressure ratio of the compressor. It is calculated by taking the absolute outlet pressure and dividing by the absolute inlet pressure. (Note, most gauges read in gauge pressure i.e. zero psi at atmospheric when it is actually around 14.7 or so psi.)Ignition timing is quite simple and the benefits to be gained are great... namely more power, longer engine life and better gas mileage. When combustion occurs it does not take place instantly. It requires a period of time. Depending on the RPM the power stroke can be .05 of a second at 1200 rpm to .0057 of a second at 10,500 rpm.I am running the 95ci with Forged High-Compression Pistons and the kompressor heads. with a 203 cam and perfect fit screaming eagle pushrods. it will be running at about 10.5:1 compression ratio. that seems fine to me but in the screaming eagle catalog it has a note at the bottom of the page that says "High-Compression Piston applications ...Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S 82-FLH Electra Glide: 80ci Shovelhead OHV V-twin with four-speed transmission. ... Thicker head gasket producing lower 8:1 compression ratio Larger rear disc The dealer put in a high output starter and added compression releases to the SE heads (had plugged holes to install them). A press of each of the compression releases and the engine spins like a top and fires up. For any high compression engine, I would recommend them. With the holes in the heads type they are around $45. Cheap and effective.Side-Valve Compression Ratio Increase vs. Power: Jan. 14, 2005 The Otto Cycle: Compression Ratio vs. Efficiency: ... Shovelhead 1972-81: Sportster 1957-* 45 WL, trike Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. Shovelhead compression specs. Modify existing air cleaner filter back.Comes with ignition MSO and a 6 month/6,000 mile limited warranty. ULTIMA SHOVELHEAD 96CI ENGINE FOR HARLEY-DAVIDSON. NATURAL FINISH WITH CHROME ACCENTS FEATURES: Black finish with chrome accents and ignition module. 625" bore. 625" stroke. Cast dome pistons. Compression ratio of 9.5:1. Camshaft: 0.450" Lift / Duration 256. LATE STYLE CAM RECOMMENDATIONS FOR PANHEAD AND SHOVELHEAD ENGINES Application RPM range Compression Ratio If you used… Then Use. Generator. Alternator. 74"-Stock 84" low compression. 106-6028 106-6027. Low - Mid 1500-4500 rpm 8.5 and below. S&S® 450 or Andrews® J or A. S&S® 513. 33-5131 33-5109 33-5131 33-5109 33-5132 33-5058. 74" and ...May 25, 2006 · #2 · May 26, 2006 Your compression is fine. The factory shop book calls for anything over 90psi with not more than 30psi beetween the two cyliders.I have a 79FXS that has been in the family since new with 28,000 mi and I get 110 psi from both jugs. T tractorhunter Premium Member Joined Dec 5, 2005 323 Posts Discussion Starter · #3 · May 26, 2006 Make Model. Harley Davidson FXS 1200 Low Rider. Year. 1977 - 78. Engine. Four stroke, 45° V-Twin, OHV, 2 valves per cylinder. Capacity. 1207 cc / 73.5 cu-in. Bore x Stroke.16. 5. G'day again fella's. Having only just bought this bike I was wondering if someone can tell me what the compression should be on a 1340 Evo. I have a workshop manual from when I had my 1993 Springer which I am now using for my '88 Springer. The manual claims it should have 90 PSI. I thought that was pretty low.Drag Specialties High Compression Piston - 3.487 in. Bore/8.5:1 Ratio - DS-750705 Keep the heart of your Harley pumping with these high-quality, cast aluminum pistons Big Twin 41-80 and Shovelhead 78-84 feature internal steel struts to control heat expansion and come in stock and low-compression versions for most Harley-Davidson models Shovelhead compression specs. Modify existing air cleaner filter back.Intended to replace the cylinders and pistons of a 80" Shovelhead engine and maintain the stock compression ratio of 8:1 Compatible with stock or S&S cylinder heads Includes S&S 3.5" bore high tensile cast iron cylinders, 3.5" bore forged standard compression pistons for 80" (4.25" stroke) engines with rings and wristpins, head gaskets, S&S May 25, 2006 · #2 · May 26, 2006 Your compression is fine. The factory shop book calls for anything over 90psi with not more than 30psi beetween the two cyliders.I have a 79FXS that has been in the family since new with 28,000 mi and I get 110 psi from both jugs. T tractorhunter Premium Member Joined Dec 5, 2005 323 Posts Discussion Starter · #3 · May 26, 2006 If you want to take the formulas with you and put them in your tool box, here they are. 16.387 is a number than converts cubic inches to cc's. Displacement =. (Bore ÷ 2)2 x 3.14 x Stroke x 16.387. Head Gasket space =. (Bore ÷ 2)2 x 3.14 x Gasket thickness x 16.387064. Deck Height space =.The Harley-Davidson Shovelhead V-twin was introduced in 1966. Here's a look at the technical evolution of the 74-cu.-in. engine and chassis of Harley-Davidson's long-running OHV Big Twin.Engine/Bike combination: This question relates to displacement (cubic inches), compression ratio , bike weight and what kind of cylinder head modifications have been done. Подать заявку. 16767 is usually just the casting numbers Harley used. ... Shovelhead compression ratio. making my way downtown with a glock lyrics. when will the ...When the engine is assembled, use one of the .030 inch thickness head gaskets instead of the normal .040 or .060 inch gaskets. This will give the engine a mechanical compression ratio of almost 9.5:1. This is considered the minimum compression ratio needed to make serious power from a Harley-Davidson engine. Change to a domed piston.models and specs Harley Davidson panhead motorcycles general specifications 1948-1965. Horsepower. Torque. Compression ratios. Model designations.Static compression ratio is relevant, but actual cranking compression is a much more important spec, just experiment with different cams, same CR and do cranking compression tests, huge difference, depending on when the intake closes. The shovel always had very low compression, especially later 80 inch versions at 7.4:1. --L1