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Let's see...... a 2.3L engine turning 4000 rpm pulls roughly 300cfm of air. I'd guess a typical smallish fan/blower is rated between 20 and 100 cfm. As I recall, our swamp cooler, which has a squirel cage fan about 30" in diameter and width, powered by a 1/2 horse ac motor, is rated at something like 500-750 cfm, and that's not at any pressure. If you figure on making meaningful boost, say 7 psi max, you not only increse the air volume by 50% or so (due to it being compressed) but also have to work against a much greater pressure difernetial. I'd say about the only realistic way to move that much air at that pressure would be a pretty good sized centrifical fan (which is actually what a turbo essentially is) which would probably wind up being about as big as the engine, (a turbo is very small becuase it rotates at 100k rpm+) and would take an enormous amount of power to drive. Probably upwards of 20 HP, more likely 30-50. (a turbo takes alot of power too, but gets it from otherwise wasted heat enegry in the exhaust, and does add some load to the engine as well)
Basically, there is no way that you're going to make anything like this in any kind of realisticly ecomonical or useful way. Never happen.
-John
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