| Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324382 is a reply to message #324379] |
Tue, 26 September 2017 08:33   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma:
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Senior Member |
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USAussie wrote on Tue, 26 September 2017 08:12Wally,
<snip>
Double trouble has an aluminum radiator in it and I don't understand how it does it but it runs BELOW the thermostat setting on cold
days at low speeds!
<snip>
Regards,
Rob M.
Rob,
I think I know.
When I had that wrong - runs too much - fan clutch, my engine rarely got to 195. I though it was the OE instrument's error, but the Digipanel (once installed) agreed. I was a bit confused until I remembered doing heat balances on several different engines. These in test cells and there were flow meters and thremocouples everywhere and a massive data-ack to accumulate a S-pot of data. At less than a sustained WOT, a large portion of the cooling was actually done by the lube oil....
Our lube oil is cooled in a radiator that is out in the cold. It could easily be dissipating the majority of the rejected heat and the airflow over the engine could do most of the rest. This would explain why my new fan that is only running when it should finally allows the engine to get to operating temperatures.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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