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7 Series - E23 / E32 (1977 - 1994)

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Old 12-26-2012, 10:47 PM
cortfitzer cortfitzer is offline
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Location: Woodland, CA
Join Date: Oct 2012
Posts: 4
Mein Auto: 735i 1990
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
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Old 12-27-2012, 03:53 PM
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joyism5 joyism5 is offline
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Location: USA
Join Date: Jan 2011
Posts: 1,271
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 03:56 PM.
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Old 12-28-2012, 08:42 AM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
Join Date: Aug 2012
Posts: 3,980
Mein Auto: E23;E32;E34;E38;R50;R55
+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.
Good - Fast - Cheap: Pick any two.
E23 735i; E32 735iL; E34 535i; 2 X E38 735iL (Oxford Green and Alpine White); R50 Cooper; R55 Cooper Clubman. E38 Parts Car
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?
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