no, I'm just blind to reality sometimes simply because I think something is cool.

Just thinking about it, no there will be no noticeable pressure increase from these fans... the fan blades don't seal the air in to the airflow, so it can't increase air pressure.

An Archimedes screw could work for this, however to spin it fast enough would take more energy than an impeller.

It doesn't seem right though, that these fans wouldn't produce pressure. Airflow, yeah, but wouldn't airflow itself produce pressure? Hmm, the only thing I can think of is it WILL produce pressure, but only negative pressure at the intake like a vacuum cleaner would.

Bah! I'll investigate into an electric powered turbine engine instead.... roflmao. [(#)]





Basically, what you're saying (and what I'm realising) is that unless the blades of the fan form a seal with the ducting, there will be little or no pressure produced, just air being moved. So, don't buy an electric supercharger unless it's an impeller type because they are one sided (they have a base plate) and the blades run flush against the ducting/housing. [:x)]

Yeah you are getting there with the idea, basically even if you had a perfect seal around the type of fan that you are using it would still cavatate giving you no pressure increase. An Archimedes screw won't work either I am afraid because even though it appears to be able to move a certain volume of air per rotation there is nothing that will stop the air from comeing back out as you put a restriction across the inlet.

This is why the power requrired to do this sort of thing just goes up and up and you try and make boost. Think of it this way you have a bike pump and you are just pumping it into air so it isn't connected to the tyre......nice and easy to do isn't it. Now you connect it to the tyre and you start pumping the high the pressure differental ( the pressure in the tyre) the harder it is to pump meaning that you need to use more power. This is very simplistic but i am just trying to illustrate how the power need to do this is so big.

I really to admire people that are willing to give things ago, but if you are serious about doing some sort of forced induction on you car then there are other routes that have been proven.

Cheers
Paul

The basics are that you need an impeller to rotate at least 80,000 to 120,000 rpm with a decent amount of torque driving the compressor. The Shear force of this flow creates pressure. A tubo spins this hard and has anywhere between 40-70psi of pressure driving the turbine. Garrett has been developing a electronically assisted turbocharger capable of generating low boost at idle 2-3psi. But unfortunately they cannot make a 12 volt motor generate enough rpm and torque. They can with 16 volts so it is just a matter of time till they succeed with 12 volts. Have a look at there website it is really interesting. www.turbobygarrett.com

I read about a supercherged car ages ago where they had a tiny engine.. Like a 1L 3 cylinder and they got the power from it by using an electric supercharger.. The idea was the economy of the 1L with the power of an 1800.. Anyway they used a 24V charging system to get the power..

Its a cool idea as it means instant boost at any rpm with no lag..

If youre after a cheap experament for a supercharger, why not get a petrol or electric garden blower, remove the motor and set up a belt drive. And there you have it[%]