cmpression leak down on s2k?
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Joined: Sep 2002
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From: Mother F'in TN
A compression test and a leakdown test are 2 different things, with different results.
Leakdown is expressed in a % of leakage. 10% leakage on each cylinder is considered acceptable. The cylinder is pressurized with air, with all the valves closed and the pisaton at TDC. The 2 gauges on the tester show regulated inlet pressure, and the pressur ein the cylinder. The difference is your leakdown %. 100psi inlet, 95 psi outlet = 5% leakage.
Anymore leakage than that you get to find where the air is going. Past the valves, rings, valve seats etc. etc.
A compression test only measues the output pressure of the piston in the cylinder. it doesn't allow you to check cylinder sealing. The "new" spec is 228psi. minimum is 135psi,max variation is 28psi.
Must be measured at 250rpm, and WOT. You need a good battery that can power the stater to spin the engine quickly, and hold the throttle wide open.
Leakdown is expressed in a % of leakage. 10% leakage on each cylinder is considered acceptable. The cylinder is pressurized with air, with all the valves closed and the pisaton at TDC. The 2 gauges on the tester show regulated inlet pressure, and the pressur ein the cylinder. The difference is your leakdown %. 100psi inlet, 95 psi outlet = 5% leakage.
Anymore leakage than that you get to find where the air is going. Past the valves, rings, valve seats etc. etc.
A compression test only measues the output pressure of the piston in the cylinder. it doesn't allow you to check cylinder sealing. The "new" spec is 228psi. minimum is 135psi,max variation is 28psi.
Must be measured at 250rpm, and WOT. You need a good battery that can power the stater to spin the engine quickly, and hold the throttle wide open.
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Elistan
Texas - North Texas S2000 Owners
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Sep 7, 2012 08:22 PM