Compression Ignition Addict
Join Date: Jul 2007
Location: Pleasant Grove,Utah
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390 is what percent of 420?
Divide 390 by 420 should come out to .92857,,, or 93 percent
Another way to check loss % is to use a leak down tester, it helps you pinpoint the leakage.
With a regulated input to the cylinder of 100 psi the gauge connected to the cyl would in your case read 93 psi
This is tested with the piston is at TDC on the combustion stroke so both valves are closed.
Now you can take off the oil filler cap and listen for the hiss of escaping air past the rings
OR at the tail pipe for leakage at the exhaust valve
or at the air filter or intake for intake valve leakage
Micha, Pleasant Grove, Utah
99 F350 Crew cab long bed, Tymar intake(The real deal)
Zoodad, 4 inch exhaust, Dipricol gauges, WW,
gutted turbo pedestal and ebpv deleted big exhaust outlet, ccv delete
Last edited by GAS; 02-09-2012 at 06:58 PM.