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Old 12-27-2012, 02:53 PM
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joyism5 joyism5 is offline
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Location: USA
Join Date: Jan 2011
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Mein Auto: '99 740IL, K75RT
For the early 90's 6 cilinder engines the book says at least 100 PSI. At 130 you have a poor-decent compression. My opinion. Around 150 I would say decent, over 160 good/great. I have seen for early 90's engines 125 PSI and 185. Before head gasket replacement, valve job and resurfacing it was 125. M50 engine if I recall correctly.

Last edited by joyism5; 12-27-2012 at 02:56 PM.
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