Well I know these motors have got the CFM but as far as holding pressure, that is another story. I have never tested them like that

The motor and electronic speed control cost about 750 bucks. The batteries that run the plane are about 400 bucks a peice and it takes 2 of them per flight. It is a very expensive hobby and I have seen grown men cry when these things crash...

 

damn. ok, that might work. but like viper said, that thing ain't gonna be $40 on ebay.

 

I'm thinking the name "miragepower" is quite apropos

 

This reminds me of the guy that was installing computer fans in his intake.

 

That is nothing more than a bilge exhaust fan from a boat. My friends and I have played with several different designs of these, and have received some performance gain, as measured at the Gainesville Raceway (where the NHRA Gatornationals are run). They only provided a couple pounds of boost, no more than 4 or 5 at best, which was good for a couple mph and about a 1/2 second quicker quarter. They are not sealed or designed to provide boost, only cfm. We think the best benefit comes in increased efficiency; the engine doesn't have to suck to fill the cylinders, the fan fills them better than the vacuum created by the moving piston can.
By the way, those numbers were on 4 cylinder engines, mostly Hondas. And no, I'm not a rocket rider, I'm a 43 year old professional mechanic that likes to try new ideas.
Having said all that, you can find different designs of bilge fans online, much cheaper. The squirrel cage designs do seem to flow much more air.
As far as cfm needed, a REALLY rough guestimate: take your displacement in cubic inches, divide that in half (no more than half the cylinders can possibly be on the intake stroke in one rotation), multiply that times you target rpm = cubic inches per minute at that given rpm. Figure that math for cubic feet from that.

 

Check this website for an electric supercharger:
http://www.electricsupercharger.com/

They have been out for sometime. There is even a guy selling the compressor section of a turbo driven by an electric motor. That sounds like the best bet for mild boost to me.

 

well dont get the last thread about this wrong. The things CAN work just these cheap models wont.

Think about it, if the thing does not push enough CFM through your intake, it can actually IMPEDE the flow of air. If the fan can spin fast enough to generate a force added to the vacuum of the engine then it could work, but once again it has to put a force AGAINST an already high pressure. The fan could theoretically let pressure out if not sturdy enough, losing HP.

VW is experimenting with electric superchargers. This is a multi-billion dollar company redesigning their intakes and throttle bodies to accommodate a auto engineer's electric supercharger. This will be seen more and more, I guarantee, but will still cost hundreds.

And I bet forcing air would work for a 4beater, but first of all they require a very low CFM to run and also, that leaf blower is constantly blowing to keep pressure in that intake. Not only is it warming up the air going in, but also not letting it get to a beneficial pressure- just low enough to hold the air being forced in that isnt escaping back out.

Now im just a new med school student but I'm just throwing some theoretical crap at it, no real world answers

 

The cfm thing is why I threw in the trying it on Hondas. If you're starting with a 96 cubic inch 4 cylinder (about 210 cfm at 7000 rpm), it doesn't take a whole bunch of cfm to fill the cylinders. A 5.7 liter v8 (approx 348 c.i) is going to take a lot more cfm (about 604 cfm at 6000 rpm following the above formula). If you can't at least match the cfm at your red line, it's going to hurt performance somewhat, but it will help at the bottom. We noticed that by leaving the fans on while the engines were running and driving around town that mileage actually improved by a couple miles per gallon, leading me to believe that the engines were not having to work as hard to fill the cylinders.
As far as the fan impeding airflow, that's a good possibility, but the same reason they can't build boost (extremely loose tolerances, big gaps everywhere) would let a large amount of air get by beyond that fans rated cfm.
I haven't tried it on my truck yet, mostly because I don't have the spare change for a fan with sufficient cfm rating. But, by using an intake coupler on one of the cheapy cold air intakes a fan could easlily be connected.