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You pressurize the cylinder to a high pressure (80-100psi)and use a gauge to read how much pressure is lost out of the cylinder to get an indication of the health of the engine. Much more informative than a compression test. That link you show if for a leakdown test, but it is a very lousy one. She doesn't even give you acceptable ranges for results, etc. Typically, 5-10% leakage is good, and what you want to see. Once you get over 20%, the engine is basically toast. You're losing 20% of your intake charge, plus lowering your compression ratio, you can imagine the power loss. A fresh race engien might get down to less than 5% leakage, but no engine will ever be leak-free.
Mike ------------------------------------------------------
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