Compression
Senior Member
Joined: Jun 2005
Posts: 672
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From: Allentown PA, - Phila, PA
Originally Posted by hachacker5024
i need to know the compression (PSI) for a 91' 1.8L LS with 124,000mi on it
U test your OWN compression with a guage...
There's no way to tell the compression on an engine with 124,000 miles unless u check it yourself...
U can find out what the compression should be when your engine is new, look in a haynes or chilton...
Or are u asking what the Compression RATIO is? if so, it's not rate in PSI.
WHAT OK YEAH!
Joined: Sep 2003
Posts: 5,565
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From: overthere
9:2:1 is your compression ratio. if the Compression Gauge reads less than 150psi then you might have some problems anything above 175psi should be fine. Eash Cylinder should read about the same they could be a little off but if there off by 15psi then something is wroung. Someone Correct me if im wroung.