[DeTomaso] Aluminum Pulleys

[F. & D. Terry]

Dan,

I don't know your intended use but you may not want to under drive 
your water pump. A friend had always had problems with overheating 
at idle and low speeds. When he installed a B&M blower, I made a 
crank pulley 1/2" larger in diameter and that corrected the 
overheating troubles.

I feel that Pantera water pumps are turning at about the minimum 
speed to prevent overheating. I think this is why we see some cars 
run OK while others overheat at low speeds. The Flowercooler pumps 
have more vanes which pump more water and solve the problem.

Just a thought.

Fred T.

Daniel C Jones wrote:
>> All 11 of my pulleys and idlers are aluminum. A word of caution,
>> however, aluminum is soft and I don't believe it holds up well
>> without being hard surfaced. I had all my pulleys hard surfaced
>> and they seem to be doing OK.
> 
> 
> I've heard that untreated aluminum pulleys wear quickly.  I believe
> March makes there pulley out of 6061-T6 and hard coat the wear surfaces
> (to 65 Rockwell "C" scale).  A local guy is making some custom pulleys
> out of 7075 and then dipping them in some sort of surface treatment.
> 
>> I can't see any advantage to having aluminum pulleys.
> 
> 
> I need a second set (keeping the first set for the backup motor) and
> thought I'd save some weight.  That cast iron crank pulley is heavy.
> 
>> You may have trouble finding an aluminum water pump pulley.
> 
> 
> March shows aluminum water pump, crankshaft and alternator pulleys for
> the 351C.  They make a couple of sets, one that underdrives (relative
> to OEM Ford, not the Pantera) and one that overdrives using a different
> size water pump pulley:
> 
>  underdrive set
>    crank pulley       5 1/2"
>    water pump pulley  6 1/4"
>    alternator pulley  2 11/16"
> 
>  overdrive set
>    crank pulley       5 1/2"
>    water pump pulley  5 1/4"
>    alternator pulley  2 11/16"
> 
> Dan Jones
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