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multiply your compression ratio by 14.7 (archive)
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Posted by Jeff 745i on July 22, 2001 at 11:37:09:

In Reply to: Campression Specifications for the 3.5 745? posted by Joe1985_745i on July 21, 2001 at 18:05:24:

atmospheric pressure is 14.7 lbs/sq inch so. I believe there are two different compression ratios for the 745 from what I have read. 7.0:1 (older 745s) is 102.9, and 8.0:1 (newer 745) is 117.6...it may be higher a few points depending on any carbon building (which takes up space in the cylinder and thus higher pressure).

On other high output engines I have liked less than +/- 5lbs, but do not know the tolerances here. If more than possible bad valve.

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