123

What about two of these?
http://cgi.ebay.com/ebaymotors/Elect...Q5fAccessories

mark kibort

yeah, a boat engine bay vent fan is going to do something.

they produce NO pressure and barely any air flow. current near 2 amps and at 12 volts, thats under 30watts! The eRAM is 700 to 1000watts, and the DC brushless versions are 1500 to 4000watts.

more rip off stuff on ebay.

inactiveuser1

On the pressure,alot of these fans they talk of thrust some are 3lbs 6lbs then there is one which is almost 6inches too big to use but puts out 28lbs thrust.
http://www.ductedfans.com/Turbo_Fan_...edfanscom.html
Different brushless motors
http://www.ductedfans.com/electric_motors_Lehner.html
When talking of watts that the electric supercharger puts out and if its pressure how would you compare the pressure into thrust to compare them?

danglerb

Mark have you ever considered using a couple of these fans on the brakes?

Fabio421

You could always use one of these. It would probably double the "added power".

Iwanna928

Have you ever look at Knight's electric superchargers? Do not know how to do the link-click thing.

Stephen

inactiveuser1

I have seen where someplace had advertised other styles on fans for the brakes on race cars etc these probably would work as good if someone is doing some are tracking the car.If you could get 4 fans in the system it might help.I have an idea on how to do it but would have to change the system all over again with some extra mods.If 2 would show an improvement then would think of the 4 fan setup after.

auzivision

When it comes to adding hp, there is a lot more to it that just adding pressure to the intake charge. Heat and flow must also be taken into account.

A DC motor is not 100% efficient, so a portion of that energy in will be heat created by the motor plus adding heat generated by compression and you can end up with less than you started with. Have any temp gain measurements been taken into account?

mark kibort

those work too, but are very expensive, and are more traditional centrifugal. but, also require 4 external batteries, and the supercharger itself is a beast. At that point, why not just bolt one on? ( a real one)

mk

mark kibort

There is an equation for pressure , based on thrust, and its dictated by diameter. (Its a pressure rise across the fan). That also only pertains to the fan in a static (free flow ) environment. as you provide restriction, the fan design then shows the pressure curve vs air flow , for the fan. generally, the more blades, the more stout those curves become. So, Its very complicated, but generally, you want the smallest diameter, but the most air flow. .
The eRAM is the best mix of those factors, to get the air flow you need, and the pressure required to make power.

mark kibort

less than a rounding error for the pressures and flow we are talking about here. The DC motors are very efficient, near 85%, so at 1000watts, , thats less than 150watts being generated in heat and noise. the pressure generated, FAR outweighs any of these losses due to the motor or compression of the air flow. you cant end up with less than you started. Yes, we have done temp rise measurements, and they match the equatiions are less than rounding errors. The net gains are in expected range as well, for HP.

mark kibort

We sold them to NASCAR team for brake cooling and in the NASCAR truck series, they used them for downforce aid, to vent the under the car flow to the rear bed for increase downforce.

inactiveuser1

Seen some 12 blade fans that were carbon style but like you said expensive $1.5k!!!
http://www.ductedfans.com/Schuebeler...ed%20Fans.html
Few of these now your talking prices of a regular supercharger lol.
Looking for something thou to finish up the system that would double the hp of it.
it ads around 10 to 12hp so if you get another 10hp into would be ok.
The pressure I would take it that if more blades the less pressure lost back thru them with under more resistance of pressure.

danglerb

Rear brakes I doubt would need any special cooling, its 80% or more on the fronts in heavy braking.

I was thinking a "clever" system would use just two efans with a valve to the brakes when the brake pedal is pressed, that maybe stays open until wot. Thinking a T so intake has no obstructions, and the open/closed valve in the leg going down to the brakes.

mark kibort

my rear brakes have hard time even getting to bedding tempurature.
They have lasted 6 full racing seasons.