COMPRESSION

  • Tiny
  • 09emdog
  • 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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Tuesday, November 29th, 2011 AT 11:30 PM

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  • Tiny
  • hmac300
  • Expert
  • 44,312 posts

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.

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Tuesday, November 29th, 2011 AT 11:39 PM
  • Tiny
  • 09emdog
  • Member

So how about 145 or 155? Too high?

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Wednesday, November 30th, 2011 AT 12:16 AM
  • Tiny
  • hmac300
  • Expert
  • 44,312 posts

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

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Wednesday, November 30th, 2011 AT 1:04 AM

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