<VV> Fans & Belts

[ScottyGrover at aol.com]

In a message dated 8/18/2007 12:00:24 A.M. Pacific Daylight Time,  
lechevrier at earthlink.net writes:

While  ruminating about the recent fan discussions here,  a couple things  
came to mind -- fan belt slippage at the fan for higher rpm, and the use  
of wrapped fan belts which more easily "slip" down into the pulley  
grooves (keeping the belts on.

So, do the wrapped fan belts cause  cooling inefficiency (overheating) 
during spirited driving?  Would  cut belts cool better if you could keep 
them on?

hmmmm  ...

Bill S



Any belt that is slipping causes inefficiency, but the problem is that the  
HP requirement of any fan rises as the CUBE of the RPM and the belt has to slip 
 or drag the engine's output down.  The '62/'63 fans are the most efficient  
in producing cooling effect but the problem there is the sheer weight of the  
sheet steel ( the fan weighs @3.8 pounds (on my bathroom scale; sorry, that's  
the only one I can use.) The idea of using an electric-motor-driven  
constant-speed fan is good, but (someone correct me if I'm wrong) the fan that  Ken 
Hand and Frank Parker installed and tested was a propellor fan, which except  in 
special casings, doesn't pump well against resistance (which rises as the  
SQUARE of the RPM.) The CFM only rises linearly with the RPM, so that just  
speeding up the fan is wasteful of energy.  Perhaps a larger fan pulley (to  slow 
the fan) would help, as the present pulley drives the fan at 1.58 times  
engine RPM.  Maybe this would be unacceptable at idle or in traffic; I  don't know.
 
Scotty from Hollyweird



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