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-   -   Compression psi? 735i 1990 (http://www.bimmerfest.com/forums/showthread.php?t=666311)

cortfitzer 12-26-2012 09:47 PM

Compression psi? 735i 1990
 
Does anyone know what the compression psi should be for a 735i 1990? I getting 120-130 from all the cylinders

joyism5 12-27-2012 02:53 PM

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.

BMWFatherFigure 12-28-2012 07:42 AM

+1: on the low side but still drivable. If you have other problems (low oil pressure; knocks; burning oil etc) and you intend keeping the car - consider a rebuild.


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