I understand that, my issue is with the accuracy of doing it that way. The variation could be caused by the compression release itself and have you wasting time trying to figure out a problem that is nonexistent. Or the compression release bleeding off pressure could mask any problem that did exist.
We hear ya AVB.. the Compression release is on both cylinders so it stands to reason you should get the same general compression reading between cylinders unless there's a problem.. It's just more of a general indicator of cylinder condition & uniformity than anything else.. See what we mean?? It is a good tool to try and diagnose trouble and rule things out is all..