Quote:
Originally Posted by Throttle Crazy
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.
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I would agree with you that back pressure has multiple definitions and that it
can be either upward flow, or
a restriction. I was just explaining what I thought Glenn's position was.
When you create pressue, it is going to try to escape in all directions favoring the path of least resistance. So when you press your lips on a piece of glass and blow, the glass isn't pushing air into your mouth, but,
pressure is trying to move
back into your mouth.
So yeah, I would call it back pressure.