compression test results
87 rx7 with 200k on it
just got it as a gift so..... i checked the compression today and it bumped even 3 times on both housings 60 psi, 95 over all. Is it time for a new motor? I see ppl saying that it has to be over 85, is that the bumps or over all? thanks |
tell "us" how you are performing this Compression test.
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hmm not bad for a motor with 200k.
i say 95 psi is average for a motor with 130-150k well atleast the owns that ive owned. |
i used the top plugs with the motor hot. the 60 psi was with the valve out. 95psi was with it in.jumped to 60psi even each time the motor was cranked.
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removing the schrader valve when using a piston engine compression tester is how it's done. it's the only way to get a true reading for each rotor face. 60psi is too low. it MIGHT start cold but hot starts will be impossible.
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"Total compression" is a meaningless number. You really just need to remove the schraeder valve, and watch the pulses. Spec is > 85 psi, but ideally you want to at least be in the 90s.
This is the best compression test writeup I've found. I think I put it in the FAQ too. http://www.banzai-racing.com/compression_test.htm |
So what do you do if you have bad compression in a rotary?
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wait for it to blow then rebuild
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