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boosted79 boosted79 is offline
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Join Date: Jan 2015
Posts: 1,263
leakdown

Good numbers for a zero hour engine. My tester is a two gauge with an .040 orifice, both gauges read the same with it dead-headed. These were taken with 80 psi inlet. I check a little before TDC so the rings are against the bottom of the lands. Sometimes at TDC the piston will rock and that can upset the rings giving a bad reading.

#1 75 6%
#6 75 6%
#2 74 7-8%
#4 70 12%
#3 76 6%
#5 75 6%

I squirted a little WD into #4 and it went up to 76-77. That one had the highest ovality of all of them at 8-9 tenths of a thou.
Old 03-26-2017, 01:17 PM
  Pelican Parts Technical Article Directory    Reply With Quote #138 (permalink)