[Spits] fan clutch

[Larry Vaughan]

Hey Joe,
That explains why a ford or chevy heats up driving thru mud, the ones 
with viscous couplers known as clutch fans anyway. So the improvement 
over fixed fans may not have been much of an improvement. Electric fans 
appear to be the best bet, if you don't blow a fuse.
I should probably use the 1973 fixed fan. Its light weight plastic.
Let me hear some opinions on the best fan setup. I am aware that an 
electric fan mounted on the front of the radiator blocks airflow at high 
speed, so it is not much of a back up except in town.

Larry

Joe Curry wrote:
> 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