Quote:
Originally Posted by enkeivette
I think Glenn's thing is, back pressure would be actual pressure pushing up the exhaust. While you're describing resistance to flow, which is pressure resulting from resistance. Not pressure resulting from some other source.
To develop: the pressure you're measuring is coming from the exhaust gas, while back pressure is not.
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Where do you think the pressure is trying to go when the exhaust valves open. I have seen exhaust systems so plugged the engine would not stay running because the exhaust was backing up to the intake manifold and the engine could not create vaccum. I would say that is pushing up the exhaust.