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I use 120psi from my compressor and use the attached regulator to adjust the leakdown tester to 100psi on the left side gauge with the piston at TDC.
If the piston is really at TDC no amount of air pressure will push it down and turn the crank.
That way is much easier and more accurate with no math because every single psi that leaks down from the cylinder is displayed as 1 pound or 1% on the right side 100psi gauge.
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