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Astroracer,
One thing you have to realize, at 5000 RPM,that engine theoretically draws 500 CFM.
But it won't draw a full charge at high revs. Air has inertia. It's one of the reasons they developed turbos and superchargers.
Also why an engine develops max torque and max HP at less than max RPM. It's running out of air.
So, any extra air you can force into the throttle body, the better the performance.
I'm not condoning this entire idea, just saying that most anything except that heating duct fan in the picture will put more air there than you will get without, as long as it doesn't, at the same time, cause an obstruction.
Anytime you move air, even by waving your hand, you ARE compressing air. You are trying to force it into the space your hand is waving toward, but there is no restriction there so those molecules move so the pressure goes back to equilibrium, atmospheric pressure.
I just went to the garage and put a gauge, just held in the web of my thumb, over the shop vac outlet hose, not a tight seal. It also has a not new filter, so some restriction to flow.
It puts out 18 ounces, 32 inches H2O, 8 kilopascal. So, you see, it actually does compress air.
A turbocharger, with no restriction, such as an intake manifold, would also move a lot of air with not a very high rise in pressure. When you use it in a car, depending on the throttle position, you might get up to, what, 2 BAR?
You get the engine to 6000 RPM or more, you might be sucking more air than even the turbo can supply, the engine poops out.
Have to go back to the engineering site, check this stuff out. No idea of the volume an Audi turbo has.
Gotta go , now, but this is interesting.
Cheers,
George
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