[darkpuppet]

bluetoy,Oct 19 2005, 06:36 PM Wrote:That thing always pushes 800 cfm. So if your engine is using 200 cfm then it has 600 cfm leftover. Since it is a fan and not a compressor it won't make boost with the extra air.

maybe the fan means to move 800 CFM all the time, but in a closed system where the air has nowhere to go, it can't push the air at all.. so you have options, compress it, bypass it, or stall it. A centrifugal compressor is really just an efficient fan..

if the fan was pushing 800 CFM of air all the time in a closed system, there would be more boost at low RPMs as the engine isn't consuming all the air flowing through the intake tract... sooner or later the boost pressure would exert enough pressure to stall the fan or the air (depending on how efficient the fan is).

just semantics I suppose.. (notice how I won't even compare it to positive displacement blowers).

All I was saying is that at 1 PSI across the RPM range, the fan isn't always able to push the full 800CFM.

Quote:But when your engine needs 600 cfm it still has extra air to keep positive pressure in the intake. If you think about the efficiency of the engine and intake system there will always be suction and the engine will be gasping for air. Gasping being loosely used. Basically your engine will never run at 100 % effieciency. With positive pressure it has a much better chance of filling the cylinders at high rpm.

thus the trick in this case is to make an engine that can breath more efficiently to get the air flow without backing up the system. A hopped up NA motor may benefit greatly from this.

Quote:I don't understand. It makes 800cfm not 300.

The only real drawback I see is that during normal part throttle driving you'd have a huge restriction in you air intake. WAIT!!!! Maybe it will act like the "tornado" and make you get 300 mpg!!!

sorry brain fart..

obviously if the fan can only keep 1PSI of pressure, it's not a very efficient fan, and while it would still be considered a restriction, perhaps it's not as big a restriction as it could be. I dunno.. that's why I don't think it'd be suitable for large horsepower applications. Even at part throttle, HP beasts would need more air than you could squeeze around this thing.