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Old 03-21-2012, 11:27 AM
Joelk Joelk is offline
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Perhaps your design is different, but the leakdown tester I have, and others I have seen used, work on the percentage difference between the guages.

If the one guage reads 100 PSI and the other 90 PSI, that is 10% leakdown.

If the one guage reads 120 PSI and the other 90 PSI, that is 25% leakdown.

The instructions with my leakdown tester recommend setting the one guage at 100 PSI to keep the math simple.
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