<E28> <all> worth while?

[rusmaster <rusmaster@xxxxxxxxxxxxx>]

All,
	There are pros and cons to this.  The under drive pulleys while giving you
some extra added hp essentially take any margin in the cooling and electrical
system the car had and throws it out the window.  With the water pulley, it
may hurt you in stop/go traffic in the heat of summer and cause the car to run
to hot.  The electrical system will probably be OK unless you add lots of
other electrical drains, like an extra electrical fan or upgraded stereo
equipment.  In the case of the mechanical vs electrical fan.  There is
evidence the elect. fan is better.  If the there is the retention of the
shroud, the elec. fan can cool the radiator better because it sets closer to
the  radiator.  Most in fact mount directly to it.  This means all the flow
from the fan is taken directly through the radiator.  The mech. fan sets ~.5"
away which allows air to be pulled from the sides of the radiator.  This is
contingent on the shroud working well and the fan is of sufficient size.  A
good 16" fan will use about 11-13A.  Thats alot.  The problem I see is fit. 
Will the elec. fan fit between the front of the engine and the radiator? 
You'll have to fit check it first to see.

Take Care,

Russ  


> Date: Thu, 24 Dec 1998 17:34:43 EST
> From: ABARTH037@domain.elided
> Subject: <all> worth while?
> 
> Ok, here it goes.  I am having my local machinist make me up some underdrive
> pulleys for my 85 535i, just alt. and water pump.  Hey he's doing it really
> cheap! But back to the matter at hand....If I could pick up an electric fan
> pretty cheap would it be worth it?  I love fabricating things, so mounting and
> wiring would be no problem, but I'd like to get you guys honest and much
> respected opinion on this.  My preliminary opinion is that it would be worth
> it because..the fan would only run when above set temp (i'm guessing 165-175
> f)......The electric fan wouldn't draw as much power as the "mechanical fan",
> especially under high RPM situations.  What do you all think?
> 
> Thanks
> Nathan
> 85 535i
>

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