COMPRESSION

1979 Chevrolet Chevette

Tiny

09emdog

November, 29, 2011 AT 11:30 PM

I am doing a compression test and was wondering what is the compression supposed to be (range) for a 1979 chevy chevette? 4 cylinder

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Compression Test

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3 Answers

Tiny

hmac300

November, 29, 2011 AT 11:39 PM

Actually anything above 90psi. Normally anywhere from 125-140 psi. But if there is a varianceof 20% on any cylinder you have something wrong, like a valve burnt or something similar.

Tiny

09emdog

November, 30, 2011 AT 12:16 AM

So how about 145 or 155? Too high?

Tiny

hmac300

November, 30, 2011 AT 1:04 AM

No that's good. As long as it's not like 145 on one cylinder and 90 on another.

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