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So searching the Internet, I've found some conflicting opinions, with an occasional person saying either that cold leak down tests are completely invalid, or that cold numbers will be two to three times warm numbers. Some people relate the numbers to how big your ring gap is: I just did a cold test on my fresh off the dyno engine, over the past 20 yrs I'...


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I did some searching on IATN and found known good pressure waveforms that are identical to my after repair captures. Unfortunately I can't post them here. It turns out that hump is completely normal. After doing more captures on different cars with VVT I've found that most waveforms are unique to some degree. I guess the same can be said about non VVT ...


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TL;DR: Either there's a problem with the head gasket, or with the piston rings. Remember, the piston rings fly over the openings in the cylinder wall, and there's no radial force onto the section exposed to the opening, pushing it into its groove. Shortly after, this section touches the cylinder wall again and experiences the radial force pushing it back. ...



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