Quote:
Originally Posted by Dave2001S
Can anyone explain how a leak down test on engine blocks works, whether the results are accurate and definitive, and what I should be looking for in terms of 'good numbers'? I am getting a head/valve job done on my 2001 S, and if the numbers look good can I reasonable conclude there is nothing faulty regarding the block? Thanks
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A leak down is measuring how much of the normally compressed charge is leaking past the rings, valves, a blown gasket, or a cracked component. The device that runs the test pressurizes each cylinder while at TDC and measures the leakage in percent. The test is very definitive and widely used to determine the current state of an assembled engine.
A test value on an individual cylinder greater than 8-10% is reason for concern.