when doing a compression on a 535i (e28) what should a good compression be???
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m30 compression test???
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100 and 105 peak..... what does this mean???
anything i can do??1989 325i SETA stroker [delphin] R3V'd 8/31/2011
1989 325ix [zinnoberrot] $OLD
1970 2002 [Nevada]
Originally posted by Herr Faust Schinkenguy must have slid into something that doesn't look like a car vs car hitOriginally posted by ak-Must of slid into Rob
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Originally posted by LJ851 View PostDo a leakdown test. Are all the cylinders close to the same compression #'s?
If the engine leakdowns well, cam timing is about the only thing that can bring down all your compression #'s equally.
Also, did you hold the throttle open while doing the comp test? This will effect results. Usually if they are all about the same, it's a good sign, unless they are all abnormally low. I think mine were ~170-180 on my parts car before I tore the engine down for HG. (Two cyls were ~50-60). It ran great once I put the new,m uncracked, head on it.
Leak down test is better anyways, and can tell you what is wrong, instead of something is wrong.1974.5 Jensen Healey : 2003 330i/5
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Originally posted by LJ851 View PostThank you slambotron, i forgot to mention that!1974.5 Jensen Healey : 2003 330i/5
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If compression is even on all cylinders then your low numbers could be explained by method or cranking speed. Throttle wide open and be sure battery remains charged as slow cranking will effect results. Also watch how the needle rises with each compression stroke, a healthy engine will get most of the way there on the first stroke. The final reading is typically taken after three strokes.
A leakdown test will tell you more.
If the engine ran well and compression is even I'd not sweat the #s.
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