[s-cars] Re: Electric fan kit?

[Trevor Frank]

Good point, the problem is that there is a lot of inneficincy in running
a fan at the rpm of the motor.  I actually worked for a company that was
developing a continiously variable transmission.  One of our projects
was replacing the fan clutch with this trans so that you could get any
fan speed you wanted, this is ideal.  The next best thing is to have the
fan speed decoupled from the motor.  Audi had to design the fan so that
at idle on a hot day, in traffic it wouldn't overheat.  So if you are
driving at speed and the fan comes on, like at a track, heavy load, high
speed, high rpm, the fan is pulling more air than needed.  So basically
when you use an electric fan you can get away with one with much less HP
drag.  I have worked on aircooled motors with up to 7-9hp or so drag on
the motor with the stock mechanical fan.  The same engine can get away
with two small pancake fans.   Have you ever seen a 9hp dc electric
motor?  These things are fractional HP.

-----Original Message-----
From: Huw Powell [mailto:human747 at attbi.com]
Sent: Tuesday, January 21, 2003 4:16 PM
To: Joseph Pizzimenti
Cc: s-car-list at audifans.com; quattro at audifans.com
Subject: [s-cars] Re: Electric fan kit?



> I was browsing around online and was wondering if
> anyone's BTDT with this sort of thing yet?  I figure
> anything that isn't pulling power from the motor's
> better than something that draws.

So where does the electricity come from?  Hmmmm....

> http://forums.audiworld.com/s4/msgs/1103296.phtml

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/
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