Quote:
Originally Posted by Gilles
Thanks JFP it makes sense, I will buy a new oil cap for the 981 and make a new adapter.
Does the vacuum value (5" of water, or less) remains the same for the M97A1 engine as well? Thanks again!
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Yes, they are pretty much the same. What you are looking for is the “steady state” (read fully warmed up engine) reading. Typically they run in the 4-5 inches of water range; anything above 6-7 is a failing AOS, and no vacuum or slight pressure is also a separate failure mode. This is why any serious “back yard” water cooled Porsche wrench should have one of these manometers, the test is a quick and deadly accurate diagnostic tool.