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356-930 356-930 is offline
Acceleration Junkie
Join Date: Aug 2007
Location: Laguna Beach, CA
Posts: 263
Originally Posted by Alan L View Post
If I have pressure on my test gauge, I can't see how I could have a leak big enough , for the small amount of gas I am putting in, for it not to register on clock gauge?

So, is there a particular point in engine rotation that this test can be done without exh overlap? I would suspect not, if the cams have overlap.
According to basic physics and Pascal's principal, a closed pressure system will have equal pressure throughout. If you have a substantial leak and the orifice to the clock gage is restricted, it's possible the orifice is acting as a big resistor, not letting the gage access the pressure where the majority of the system's volume exists.
If you shut off the air supply, how long does the engine system hold pressure?
If the gage isn't even moving, I'm as baffled as you for your 930 has defeated Pascal's law. (A 930 may be able to defeat the law of the street but not physics).
I don't know if there is a point without overlap either.
Old 04-16-2008, 01:15 PM
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