[Spits] fan clutch

[Joe Curry]

Larry,
I think you are talking about the "Viscous coupler", which is not a clutch
at all and as I understand the thing it does not react to temperature at
all.  Instead it is designed to limit the fan speed at higher rpm to reduce
noise and limit the pull don on the engine as it virtually free wheels at
higher rpm.  I think the theory is that it pulls when you are driving around
town where the speed is not sufficient to keep natural air flow through the
radiator.  When you are at speed the thing free wheels allowing the natural
air flow to cool the engine.

Someone please correct me if I am wrong.

Joe

-----Original Message-----
From: spitfires-bounces at autox.team.net
[mailto:spitfires-bounces at autox.team.net] On Behalf Of Larry Vaughan
Sent: Saturday, August 18, 2007 3:28 PM
To: spitfires at autox.team.net
Subject: [Spits] fan clutch

I bought a new water pump for my Spitfire. It's a mongrel but I went 
with the 1977 large upright radiator and the clutch type fan. Before I 
mounted the clutch on the new water pump, I heated it up with a hair 
dryer to see how much the resistance changed. When it was too hot to 
handle bare handed, with mitts, I could turn the center part as easily 
as when it was cold? There is a fair amount of resistance cold but it 
should increase with heat right? How much heat? To the point of lock up?

Larry
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