Mike, most of my experience is with street cars. Some of that will carry
over however. I'd suggest that you set the switch to the temperature you
want to race at or below. You will most likely only need it on the grid or
in the pits when you're tuning. Here's why I say this. The fan on a street
car moves a lot of air under the hood not only to cool the radiator but also
to remove the under hood hot air that can cause vapor lock, especially if
you're using headers. The heat from the exhaust rises directly to the
carburetor bowls and boils the gas pretty quickly. You need to move that hot
air the best that you can when at rest on the grid. If you wait too long to
move that air it's very hard to cool the bowls before you start to move.
That's why I suggest you set the temperature at or below where you want to
run during the race. Actually you may want to remember to turn it on
manually on the grid no matter the temperature as you need that air movement
under those conditions. Under racing conditions you will most likely not
need a fan and I doubt that it would do any good at racing speeds.
Also, if you have not already done so make sure to install one of Joe
Alexander's Heat Shields. They provide an extra pound of protection against
header heat rising.
We have a foot of new snow here in Hudson, my guess is that you've heard
that from your relatives back here.
JVV
----- Original Message -----
From: "Mike Mehl" <mike.mehl@yahoo.com>
To: "Triumph Friends of" <fot@autox.team.net>
Sent: Saturday, February 06, 2010 2:43 PM
Subject: [Fot] TR4 water temp. fan switch question
> What temp should I have the switch set to for the fan to turn on?
> Thanks!!!!!
>
> Mike Mehl
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