Originally posted by 1FastMopar
We seem to have a communication problem here, probably because I'm talking about absolute pressure, and you're talking about vacuum. The way I see it, there is no such thing as a vacuum, there are only different levels of absolute pressure. If you have a blower making 8 psi boost, that is relative to atmospheric pressure. The absolute pressure in the atmosphere (talking sea level for convenience) is 14.7 psi. Add 8 psi boost to that, you get 22.7 psi. That's the difference between what's forcing air into an unblown engine, and a blown engine.
I really don't see why you would consider these to be different situations, requiring different ways of thinking about cylinder heads.
I do see why DF would not be so concerned with flow velocity with a carbureted, blown engine...and that's because of the egg beater (blower) that helps to atomize fuel.
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