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IMHO - this is an interesting question namely - What is the specification for making a leak down tester? The last time I googled this to death I could find no specification e.g. orfice size or orifice specification. There could also be a pressure and flow rate curve with tolerance that an automotive leakdown tester should fall within.... but there isn't. I expect you could get 10 leakdown testers and you would get 10 different results. That being said, as most will agree the important thing is that the cylinders are leaking the same amount and from approximately the places. If anyone can find a spec. for an automotive or Porsche leak down tester, please post. I'm pretty sure the airplane industry has a spec.
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