Actually much has been done using blower fans 1000cfm+ on carbs in the field of mud racing.
In mud racing the air is usually pulled from above the dash on the passenger side and pushed out through 1 or 2  4" hoses to a sealed chamber around the carb this reduces the chance of pulling muddy water into the engine. Typical fan ratings for the 2 hose system would be something like 2 fans rated 850cfm @ 10-15 psi.
The fans are usually connected to a WideOpenThrottle switch as most mud racers only know two speeds (WOT and off).
I do not know if they have mud racing in your area, it well may be a "red-neck" sport, but if they do talk to some of them for pointers (but keep in mind that the loosest screw in most mud trucks is the nut behind the wheel)

KF4HAZ - Lonnie
 
<snip> 
> > You don't mention an air-flow meter in your posts
> > 
> > so I'm assuming your car has a carburettor?
> > 
> >  
> > 
> > If so then to deliver fuel correctly it requires a pressure
> > 
> > differential across it. Superchargers and Turbos 'suck' air
> > 
> > through carbs, you're proposing a blow-through system,
> > 
> > these are mostly fuel-injected.
> > 
> >  
> > 
> > If you increase the upstream pressure with your fan
> > 
> > then the carburettor will be fooled into delivering
> > 
> > less fuel unless you also pressurise the float bowl.
> > 
> >  
> > 
> > What speed were you thinking of running the fan at
> > 
> > for cranking, idling or maximum revs?
> > 
> >  
> > 
> > Think about the implications of a piece of your
> > 
> > fan coming loose and ending up in the cylinders,
> > 
> > not nice!
> > 
> >  
> > 
> > I don't want to be a kill-joy but the chances of getting
> > 
> > something very wrong are... very high.
> > 
> >  
> > 
> > Up to you but I'd just check the filter regularly.
> > 
> >  
> > 
> > Regards,
> > 
> >  
> > 
> > Nigel Duckworth
> > 
> >  
> > 
> >  
> > 
> >  
> > 
> >  
> > 
> > -------Original Message-------
> > 
> >  
> > 
> > From: microsoftwarecontrol
> > 
> > Date: 03/22/05 10:36:49
> > 
> > To: Microcontroller discussion list - Public.
> > 
> > Subject: Re1: [OT]fancy think: add a fan in air inlet of car
> > 
> >  
> > 
> >  
> > 
> > kilowatts? that means the fan from a house hold vaccum machine
> > 
> > will almost do. I have a used computer UPS, it can provide
> > 
> > 110V/1000W with 12V battery. If I see positive
> > 
> > result from my smaller fan, may be to try this. but
> > 
> > with kilowatts range, I am sure it will affect
> > 
> > combustion of engine greatly. better or worse?
> > 
> >  
> > 
> > Of cource, if adding a fan worsely affecting engine
> > 
> > combustion performance, I will take fan off.
> > 
> > But that will happen after I test it.
> > 
> >  
> > 
> > Now, what I want is only to compensate pressure drop
> > 
> > caused by dirty of air filter. For fan, Air Flow Rate is proportional
> > 
> > to fan speed, pressure head is square of fan speed. I will try
> > 
> > to run my fan at higher voltage when Flow Rate is not enough.
> > 
> > The fan on my hand, looks strong and for high Flow Rate.
> > 
> >  
> > 
> > Now, I realize another point: cylinder movement of car engine,
> > 
> > is very good vaccum machine already. After measuring pressure in
> > 
> > different location, i will be a much better understand for 
> > adding a fan.
> > 
> >  
> > 
> >  
> > 
> >  
> > --
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> > your membership options at 
> > http://mailman.mit.edu/mailman/listinfo/piclist
> > 
> 
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