Mechanics

COMPRESSION

1979 Chevrolet Chevette • 28,000 miles

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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09emdog
November 29, 2011.




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.

Hmac300
Nov 29, 2011.
So how about 145 or 155? Too high?
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Tiny
09emdog
Nov 30, 2011.
No that's good. As long as it's not like 145 on one cylinder and 90 on another.

Hmac300
Nov 30, 2011.

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