Just throwing this out there for information sake...In the aircraft world in which I come from, we use the leakdown tester all the time for diagnosis of an engines health. Although we do look at the leak down percentages for uniformity amongst all the cylinders, more so the ability to listen for leaking valves through the intake tubes or exh headers as well as air whistling through the crank breather (leaking rings perhaps) makes the leakdown a much more reliable indicator of engine condition. You must be aware that sometimes a poor reading is not always indicative of a failed component. Pieces of carbon can sometime lodge between the valve face and seat giving erroneous readings and to a lesser extent between the rings and cylinder wall. When we see a negative indication, the first thing we do is bump the valves off their seat and a high percentage of the time that clears the problem. If not, then we run the engine up to full temp and then re-evaluate. While not the same as a high revving v8, aircraft engines share some similar operating conditions such as high sustained operating temps, large clearances and contamination due to high lead content fuel. -Your mileage may vary, use at your own risk and now back to regularly scheduled programing :thumb:
