This is my solution to the airflow issue - modulate the fan speed.
I am investigating replacement of the fan with something more intelligent.
In many data equipment applications the fans also have thermistors and tach
outputs. A small (and conveniently 12V) circuit controls fan RPM based on
temperature.
I am in the process of experimenting with a fan/control combination that
works in direct proportion to the engine temp instead of ON/OFF. With a
non-thermistor fan I may end up replacing my fan-switch with a temp sending
unit. That way I have a value (R) to scale fan speed against.
The most extreme iteration would also know through a speed sensor if you
were moving or not and might reverse the fan at 0-2 mph so your knees aren't
cooked.
Mike Oberle
[EMAIL PROTECTED]
====================
1990 Midnight Blue
-----Original Message-----
From: Thomas Powell [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 18, 2000 3:01 AM
To: V-MAX TECH LIST
Subject: Re: Borg-Warner, Wells, etc.
This whole fan switch thing bothers me and this last "E" I guess was the
kicker.
For one I do not understand how changing a switch will by miracle keep the
savage beast cool. My fan is running just fine as I watch the temp climb
when I am in traffic. It does not matter what turned it on or when, it is
still on and the temps are still climbing. The new temp switch does not
make it run faster. I never had a problem with heat with the stock engine.
It would actually cycle on and off in traffic. The only time it has gotten
hotter than I want now is on a couple of occasions when I was stuck in
traffic and the 10-15 mph trade winds here (which can be a blessing) are at
my back so I have to be going over 10-15 before there is any air flow
through the radiator from forward motion. The problem I see it is not the
size of the radiator or the temp the fan cuts on but the air flow of the
fan. As soon as I get going she cools back down so the radiator is enough,
just not enough air flow. I really do not know why you would install a temp
switch that will basically keep the fan on unless you are traveling at fair
speeds (from what I understand) when it is not needed. And with the
marginal charging the beast has why have the fan going when it is not
needed? Then, talk about putting in a switch that will cut off the fan when
you do not need it. Why spend the money for the temp switch in the first
place? Just put in a manual switch to cut the fan on ahead of time when you
see or expect traffic so it can get ahead of the heat build-up. I still am
pretty sure that if I am in the same situation long enough she will heat up
again. I definately am not trying to step on any toes here, maybe I am not
getting the big picture. I am thinking about putting in a manual control
switch for the fan. The real fix is something that will replace the stock
fan that will push enough air. Anybody got a junkyard close to them where
they can do some investigating?
====================================
Thomas and Carrie Powell
1994 NOS injected
Tourmaster V-Max
"LAFGAS"
[EMAIL PROTECTED]
http://albums.photopoint.com/j/AlbumList?u=957019
====================================
----- Original Message -----
From: Dennis Clarke <[EMAIL PROTECTED]>
To: V-MAX TECH LIST <[EMAIL PROTECTED]>
Sent: Monday, July 17, 2000 12:37 PM
Subject: Borg-Warner, Wells, etc.
> Hello there,
>
> just want to mention here guys,,, that when running the Borg Warner
thermal
> switch you can wire in an on off switch. so you can turn the fan off when
> not needed (like on the highway) or whenever.
>
> theBorg-Warner keeps the fan on much of the time, even below midpoint on
the
> gauge? I'd rather have the fan running almost constantly, instead of
> flirting with the red line all the time.
> ________________________________________________________________________
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