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The BMW Range
3 Series
E46
SMG Share thread
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<blockquote data-quote="B33mEr" data-source="post: 570693" data-attributes="member: 13609"><p>What are the compression values for cylinder 1-6? From what i gather it's normal to have a varying psi for each cylinder</p><p></p><p>Taken for e46fanatics.com:-</p><p>"There shouldn't be any difference in the compression between a ZHP / non ZHP they both have the same compression ratio. The biggest difference is longer duration camshafts.</p><p>A 330 (10.2:1 compression ratio) should be a little less than a 325 (10.5:1 compression ratio)</p><p></p><p>Looking in a Bentley Service manual it shows:</p><p>The compression test should show a minimum 10 - 11 bar, 142-156psi.</p><p>Max difference between cylinders 0.5 bar 7 PSI"</p></blockquote><p></p>
[QUOTE="B33mEr, post: 570693, member: 13609"] What are the compression values for cylinder 1-6? From what i gather it's normal to have a varying psi for each cylinder Taken for e46fanatics.com:- "There shouldn't be any difference in the compression between a ZHP / non ZHP they both have the same compression ratio. The biggest difference is longer duration camshafts. A 330 (10.2:1 compression ratio) should be a little less than a 325 (10.5:1 compression ratio) Looking in a Bentley Service manual it shows: The compression test should show a minimum 10 - 11 bar, 142-156psi. Max difference between cylinders 0.5 bar 7 PSI" [/QUOTE]
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