[blykins]

Some can explain things a lot better than I can. I can see it in my head, but my fingers don't type what I want sometimes.

The momentum and inertia comments are pretty much dead on and that's why it's best to differentiate between a flow bench and an engine.

If some of you guys can remember the Boss 302 Mustangs, you have a very small engine that is relying on a huge head to supply an intake charge. A little engine sucking on a huge port (that has huge flow capability) can't muster enough vacuum to get the intake charge moving quickly. At low rpms, these cars were turds and it really took some rpms to get them to make an efficient pull on things.