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Re: Compression revisited -- 145-155 or 200psi? (archive)
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Posted by Chris W. on January 08, 2001 at 19:54:02:

In Reply to: Compression revisited -- 145-155 or 200psi? posted by Greg I on January 07, 2001 at 17:55:12:

There may be nothing to worry about. A few months ago the chief mechanic at the local BMW dealership gave our local BMW car club a presentation about pre-purchase inspections. One of the tests they do is a compression test. He said that the compression test value wasn't too important because the gauges weren't very accurate to begin with, and if they've been shaken or dropped sometime, they're really not going to be accurate in exact value.

What he said was important though, was that the compression be relatively even between the cylinders. I think he said that you didn't want the compression to vary by more than 10% between cylinders or else it could be an idication that something was wrong.

Hope that helps put your mind at ease.

Chris W.

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