harley evo compression test|Piston compression psi help : distributors I remove both spark plugs, and then put the compression tester in one of the spark plug holes. Twist the throttle full, and crank over the motor 5-6 times. Take the reading .
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80 EVOs are almost bullet proof. Keep changing the oil every 3k and when the compression drops below 12% of your initial reading, do a top end job. If your on your way over 70k miles, do a bottom end job also. 80 inchers are probably the best motor HD ever came out .I did a compression reading on both cylinders while the engine was cold and .
I remove both spark plugs, and then put the compression tester in one of the spark . I did a compression reading on both cylinders while the engine was cold and both came up to 180 psi. Can you tell by the reading if it is a 88 . Hey I need some help finding the correct PSI reading when doing a compression test on a 2012 wide glide with a stock unmodified 103 engine.
I remove both spark plugs, and then put the compression tester in one of the spark plug holes. Twist the throttle full, and crank over the motor 5-6 times. Take the reading . See more tips and how to's on Countersteer : https://www.jpcycles.com/countersteer?utm_source=youtube&utm_medium=description&utm_campaign=How_to_Perform_a_Co.
If it's mostly stock (in particular if the compression ratio is still stock), then 120 psi is a bit high for a stock 80" Evo. If it's stock, you're looking for about 90-100 psi. 120 psi on a .
Harley Davidson Motorcycles. Softail Models . Compression. Thread . 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. . I did a test on the bike and it read 190 PSI for the .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 .
Piston compression psi help
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Then repeat the compression test. If the reading returns to normal the rings may be defective. If the compression does not increase to within 10% then the valves of that cylinder may require service. . The piston pin clips . I just did a compression test then I read you have to have the throttle wide open when doing it which I did not. I got a reading of 120 psi in both cylinders but is it inaccurate if the throttle was closed? . Harley Davidson Community . G. goofysniper Member. Apr 11, 2009 #3 Does that sound like a lean problem to you though? Id rather go a .
1998 Evo, EV-27 cam 10.1 Compression Jump to Latest 34K views 27 replies 13 participants last post by cid Mar 30, 2014Performance and Technical information on cylinder heads, valves, valve sizes, valve springs, port size, port shapes and compression ratios for Harley-Davidson motorcycles. Compression Ratios. Increasing the compression ratio of an engine is one of the best ways to increase horse power and torque. I'm wondering, isn't there a correlation between compression ratio, and how many psi you have when doing a compression test? This my answer your question. Isn't a stock evo motor around 140 psi on the compression gauge, and isn't that 8.5 to one? I believe my motor is 10.5 to one, and has 180 psi on the the gauge.
A leak-down tester is an excellent tool for checking cylinder sealing and more revealing than a compression tester. A leak-down test can identify leakage past the piston rings or a valve. . it takes roughly a 15.5:1 compression ratio with an aluminum head Evolution engine to match a 14:1 compression ratio with an Ironhead Sportster . That is indeed how I did the test, took bike out for a few miles, came back, turn off gas and run carb dry, pull plugs and unplug coil pack, wide open throttle, and several revolutions. One thing I noticed is that both my bikes (both 88s) made max compression on the gauge at around what appeared to be three revolutions or so.
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Harley Davidson Motorcycles. Dyna Models . Piston compression psi help . 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% variance between front & rear. . Hey I need some help finding the correct PSI reading when .Those Dyno Guys. Building 2, 7200 73rd Street North, Pinellas Park, FL, 33781, United States 763-263-3966 [email protected] Evolution engine at the Harley-Davidson Museum. The Evolution engine (popularly known as Evo and sometimes as Blockhead ) is an air-cooled, 45-degree, V-twin engine manufactured from 1984 by Harley-Davidson for the company's motorcycles.It was made in the 1,340 cc (82 cu in) displacement for Harley-Davidson Big V-twins bikes, replacing the . Understanding the severity of a head gasket leak is crucial. A compression test can reveal uneven pressure levels, indicating a breach in gasket integrity. Using an engine stethoscope can help discern between normal and problematic engine sounds. However, given the complexity of head gasket issues, consulting with a professional motorcycle .
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 . IMO you can't tell if you have high compression pistons by doing a compression test. Too many factors of cam specs. involved. Not counting conditions of valves rings, etc. . 98 Evo 83.5ci, custom cam, 44cv, lightened ballanced crank, H-Beam rods, beehive springs, tapered pushrods, johnson hylift lifters, SE slip-ons no baffle, 101.78 hp .
Altitude Correction : Feet Above Sea Level : Corrected Compression Cold Cranking Compression Values in RED are approximate. Use actual measured values only. This calculator is supplied as a convenience and intended to be used for estimates only. We make no warranties, implied or expressed, to the accuracy of any data or calculations presented here. The cylinder compression test will give a reading in PSI on the gauge , such as 135 PSI . I think there's a formula that will give you the average cylinder pressure useing the compression ratio variables but not the other way around . . Good example, a stock 80" Harley Evo should see around 95-100 PSI (I think the service manual actually . compression test..HELP!!! Hi does anyone know what a maximum reading of compression psi could be for an '88 evo motor ,recently built a basket case motor and its was initially hard to start,thought it had a bad starter so bought an all balls 1.4 kw and new battery which seemed to cure it for a while then it fried!got a new one but struggled to turn motor over .
Performing a cylinder leakdown test is crucial to determining the mechanical integrity of an engine. I'm demonstrating this on a Harley Davidson Shovelhead, .Harley-Davidson Motorcycle Performance Guide. Big Twin Evolution 80 CID Horsepower Gallery : Performance and Technical information on engines for Harley-Davidson motorcycles. This is a list of verified horsepower figures for a variety of Big Twin Evolution Engines. Cranking Compression Test Numbers. Jump to Latest . General Harley Talk Twin-Cam Engine Harley Davidson Evolution and Twin Cam Touring My Story, the Beginning. Harley-Davidson FXR. Top Contributors this Month View All. Jack Klarich 103 Replies. rootintootin 49 Replies. Brand'd 47 Replies. HOW MANY POUNDS SHOULD EACH CYLINDER HAVE ON A 1985 EVO MOTOR WHEN DOING A COMPRESSION TEST? - Answered by a verified Motorcycle Mechanic. . need to replace the evo motor on my 89 fxrs harley davidson. will any evo motor from 1985 to 1992 evo work? .
Find Automatic Compression Release 28861-07A at Harley-Davidson.com. Free shipping on orders + and free returns. Find Automatic Compression Release 28861-07A at Harley-Davidson.com. Free shipping on orders + and free returns. . Test Ride; Dealer Locator; Track Order; Sign Out; Aria locale Select locale .
I am new to this forum, and am looking for some info on machining and installing compression release valves in evo heads. I have fixtures for twin cam heads but can not find anything for evo heads. . A forum community dedicated to all Harley-Davidson model owners and enthusiasts. Come join the discussion about performance, modifications .
Harley faces their air fuel ratio largely on the fact that they run a 14.7 to 1 air fuel ratio. If you run a richer air fuel ratio around. 13.5 to1. . you can always warm the bike up then do a compression test to see what you have and go from there or find a calculator online to help . 98 Evo 83.5ci, custom cam, 44cv, lightened ballanced .
If the compression test was not run this way, the results don't tell us anything. 2. A compression test is too general to reveal the condition of the top end; next test should be a leak down test to find out where the compression is being lost. 3. 1/4 of oil consumed in a 250 mile ride = 1 quart every 1000 miles.In this DIY Tech Tip from Lowbrow Customs, Todd shows you how to test your motorcycle's compression, and what it means. A simple compression tester which is .
How to perform a cold compression test
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harley evo compression test|Piston compression psi help