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18V high compression are slightly higher at 9.0:1 and 170psi at 275rpm.
However 18V engines to European emission control requirements ECE 15 are quoted as 170 to 190 or 195psi, although some have said that pressure can't be reached with 9.0:1 compression ratio.
If that were 100psi also the cylinder would be perfect, which of course won't happen, it will always be lower.
The bigger the difference between the two gauges the faster the air is leaking out of the cylinder.
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1, 3 and 4 were 160 to 173psi dry, 173 to 185psi wet. The dry to wet increase is pretty-much the same for all, so bores look OK, but I need to check the valves to see if that's the cause of 2 being low, or whether it is something else.The general rule of thumb is that anything more than 10% difference from the lowest to the highest warrants investigation, and in reality they should be closer than that under normal circumstances.