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 660 compression test with cam?

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heavychevy



Posts: 27
Join date: 2013-05-19

PostSubject: 660 compression test with cam?   Tue May 21, 2013 11:29 pm

Has anyone done a compression test with a aftermarket cam how was the result? I just did one on mine it has a hotcam 4100-1. I warmed the engine up and did full throttle for the test and came up with a hair under 130psi. Service manual says 163 min 210 max but that will be with a stock cam does it change that much? I will check valve lash now and see if i got a problem there but am curious what others have found? I dont use any oil or smoke so im not sure if shes tired or the cam is bleeding off the pressure with the duration etc.
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rhino727



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PostSubject: Re: 660 compression test with cam?   Wed May 22, 2013 10:59 am

the cam will not change compression , It allows the valve's to open further an or stay open longer , once this has happened the piston comes up to create the compression , which is seal on rings , shape of piston--flat top, dome, dish, an head combustion chamber , bore an stroke will make your compression

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08Rhino450SE



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PostSubject: Re: 660 compression test with cam?   Wed May 22, 2013 12:24 pm

without getting too far into it, a lot of overlap in the cam (both intake and exhaust valves open at the same time) will result in a lower CORRECTED compression ratio, which is the benefit of installing a cam. i would advise consulting the manufacturer if nobody on the forum with a similar setup can answer your question. the short answer, however, is that no, it should not reduce your MECHANICAL compression ratio if you have not made changes to your displacement. bounce

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heavychevy



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PostSubject: Re: 660 compression test with cam?   Wed May 22, 2013 1:05 pm

im only talking cranking compression as nothing else has changed
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08Rhino450SE



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PostSubject: Re: 660 compression test with cam?   Wed May 22, 2013 1:10 pm

do you have the ability to do a leakdown test to see if there's a leak?
also, if you squirt some oil into the cylinder and test again and the pressure is higher your rings aren't sealing...

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heavychevy



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PostSubject: Re: 660 compression test with cam?   Fri May 24, 2013 3:34 pm

bump
anyone that has a stock piston and aftermarket cam that have done a compression test how did it come out?
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