Compression

1979 CHEVROLET CHEVETTE
28,000 MILES
Avatar
09EMDOG
  • MEMBER
  • 35 POSTS
I am doing a compression test and was wondering what is the compression supposed to be (range) for a 1979 chevy chevette? 4 cylinder
Nov 29, 2011 at 11:30 PM
Advertisement
Avatar
HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 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.
Nov 29, 2011 at 11:39 PM
Avatar
09EMDOG
  • MEMBER
  • 35 POSTS
so how about 145 or 155? too high?
Nov 30, 2011 at 12:16 AM
Avatar
HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 POSTS
no that's good. as long as it's not like 145 on one cylinder and 90 on another.
Nov 30, 2011 at 1:04 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.