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Comments sought on compression test results... 200 1979

posted by  pierre on  Tue Mar 4 02:32 CST 2003
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last visit: Fri Oct 10 10:49 CST 2014
[RELATED]

Thanks for the detailed reply, Manolo...

I live a few hundred feet above sea level. I have a "K" camshaft on. I am happy to have learned the reason for the lumpy idle. From some reading I have done since posting my question, it seems such a cam will lower the pressure-gauge reading about 10 PSI.

I am positive valves/seats are not leaking as they were just recut.

From Volvo's specs of 128-156 PSI for the B21F with 9.3:1 CR and factoring in the lower readings the "K" entails, I extrapolate the 11:1 CR should make for an approximate 141-174 PSI range. My present 148 PSI tells me I probably will not go another 150k. miles with my engine as is.

Thanks again for your great reply, Manolo, and thanks to the other posters as well.






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