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Discussion Starter · #1 ·
I'm about to do a compression test, and depending on the manual used, i get different parameters of acceptable psi in the cylinders. At what psi is a motor considered worn and in need of a rebuild?
 

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120# is good. Make sure all the cylinders are within 10# or so of each other. What you are really looking for is to make sure there are not huge differences in compression from one cylinder to another. If they're at 110 don't panic as long as they are all close.
 

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yea i was told in automotive college that all the cylinders on the same bank should be within 10% of each other
 

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Just for reference, I did a compressoin test (cold w/o adding oil to chamber) before the Power Tour a few weeks ago, and all cylinders were 150-155psi on my 1989 LX 5.0 w/155K original miles.
 

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Discussion Starter · #5 ·
Ok, thanks, that's some good reference to start from.
 
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