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Re: [GMCnet] Oh, Sure, Another Fan Clutch [message #247406 is a reply to message #247400] Mon, 14 April 2014 15:05 Go to previous messageGo to previous message
GMC.LES is currently offline  GMC.LES   United States
Messages: 505
Registered: April 2014
Karma:
Senior Member
BTDT on my own car. I feel the pain suffered by those who have to pay for the "education" of others.

Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress



On Apr 14, 2014, at 3:31 PM, roy@gmcnet.org wrote:



A Hamilto wrote on Mon, 14 April 2014 11:15
> gmc.les wrote on Mon, 14 April 2014 13:06
>> Patrick,
>> A very interesting example that brings a few thoughts to mind.
>>
>> Moving air with a fan takes horsepower, the higher the air flow being moved, the higher the HP consumed. I don't have exact facts to quote, but I do believe that the OEM fans on our coaches consume several HP because of the air they need to move. Trying to produce the equivalent airflow with electric fans is going to require a fairly hefty electrical output (possibly 150-200a?)...
> A working system has been documented to draw 60 amps, and required an alternator upgrade to support the extra load.
>
> http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=140931&rid=2083#msg_140931


A friend of mine has a 69 firebird that he had an aftermarket A/C installed. When they got done they put an electric fan and shroud on it . The engine ran hot so they installed a larger radiator and new water pump. It still ran hot so they went to another shop and that mechanic put a smaller water pump pulley on it and a hi flow water pump. He came by my place a couple of days ago and the engine was at 230 degrees and the new larger radiator was 235 half way down. The air wasn't even on. The new electric fan moved only a small amount of air. Next week I am pulling that fan and installing the stock shroud and a heavy duty clutch fan. If I put in a bigger electric fan that was suggested it will draw 60amps. His alternator is 37 amps that wouldn't support it and what about the needed relays and wiring etc. I feel a good clutch fan is a lot easer to deal with. Buy the way my friend is thousands of dollars poorer from this experience .
--
Roy Keen
Minden,NV
76 X Glenbrook
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