Numbers from leakdown test

[exgmguy]

I keep fouling a plug with oil, and made pretty crappy numbers on the dyno so I first performed a compression test. The results were about 165 lbs across the board, then I purchased a leakdown tester and went to work.

The oil fouling cylinder had a leakdown of about 30 percent, while the rest were about 22 to 25 percent. The gauge reads this to be a low, acceptable leakdown rate. The moderate zone starts at 40 psi. The test was also done on a stone cold engine. I assume a warm engine would be slightly better.

Does anyone have experience with leakdown testing? Any idea if these numbers are actually acceptable?

Thanks,

Rob

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1988 Mustang GT
11.8 @ 123 (7/14/01)
11.5 @ 120 (9/14/01)
1992 BadAzz Wrangler
1993 Explorer

See my car at: www.mustangworks.com/cgi-bin/moi-display.cgi?179