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Old 01-01-2006, 03:00 PM   #2
Gearhead999
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Join Date: Sep 1998
Location: Oviedo, FL
Posts: 992
Default Re: Stock Cranking Compression

It really depends on the year. Cranking speed, compression ratios and cam timing effects the total PSI.

I'd look for something in the area of 125-150 PSI. More important is the variance between cylinders. Should be 10-15% maximum. And any cylinder way off, like everything is 130-135 PSI and one hole is 90 PSI. That's not good. Then you have to determine, why?? Squirt some oil and do it again. See if it comes up. If it does you have a ring problem, if not its a valve problem, etc.

Good luck, Happy New Year !!!
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