Compression stuff, How's it possible.......

I've pondered that same thing many times...like every time someone mentions a reading higher than is theoretically possible. I've come up with some possible answers:

1. The engine has been modified to raise the compression ratio.
2. The combustion chamber is reduced in volume due to deposits...effectively raising compression ratio.
3. The manufacturers deliberately change the calibration of the gauges so they will sell better. (feelgood error)
4. Multiplying 14.7 x 6 produces a different result, if you went to a different school.
5. We can compute it in absolute pressure by adding the absolute beginning pressure, and then deducting it from the final result...comes out the same.
6. Another metric conspiracy.
7. All the variables (cams, timing, engine condition, ect.) that have been mentioned will all produce a lower reading.
8. The lower reading for the first few strokes is because of the volume of the measuring equipment itself which has to be pumped up. It can't pump higher than atmosphere times compression ratio.
9. Running the test at a location below sea level.
10. The manufacturer made an error when originally computing the compression ratio.

George Willer