compesion testing

[onahog]

FYI>Mine,cold egine,throttle wide open,55f temp ..175 psi with 8000 miles,2009 triglide,,sns 557 cams 250 miles old
Default RE: Compression Test Readings?

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It varies dramatically with the test tool used, battery strenght and ambient temperature. On our Snap-on gauges it's typically around 180-190. We would not normally tear a motor down unless the numbers were below H-D specs and then only after checking leak down and some other tests to confirm that the low numbers are real (trying other gauges for example).
__________________
Mike Stegmann
Performance Consultant
Team Latus Motors Harley-Davidson

 

[Gorilla]

Thats a good reading is it the same or with in 10% on both cylinders?

 

[msocko3]

FYI>Mine,cold egine,throttle wide open,55f temp ..175 psi with 8000 miles,2009 triglide,,sns 557 cams 250 miles old
Default RE: Compression Test Readings?

You won't be able to get a true CCP with the S&S easy start cams, part of the easy start feature is holding the exhaust valve partialy off the seat to bleed off compression while the engine is at cranking speed then it retracts once the engine is running. Your CCP without the easy start feature should be in the upper 190's with those cams.