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Old 03-03-2019, 08:46 AM   #23
Gilles
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Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,955
Quote:
Originally Posted by JFP in PA View Post
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.
Thank you!

I will get Luke a call o get the correct oil cap for the CS, just need to source the small nipple to connect the rubber hose to the oil cap
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