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Author Topic: Radiator fan consumes over 10% of engine HP!  (Read 16180 times)
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« Reply #75 on: June 15, 2011, 08:44:53 AM »

MCI on the setup they have it cuts the rate down from a pump that will circulate up to 95 gals a minute down to 70 @1800 rpm I watch that test with my own eyes at Stewart and Stevenson when Cole was figuring how much radiator and fan hp was needed for the series 50 they were installing for Greyhound and believe it or not those fans are high hp draw saw that on the dyno they drop about 15 hp when the bottom doors on that system are working properly and I don't know how they are supposed to work

good luck

Life is short drink the good wine first
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1980 MCI MC-5C

« Reply #76 on: June 15, 2011, 09:46:47 AM »

The doors work from the shutterstat, same system as the radiator  shutters.  When it's cold out, and the coolant temp is low and there is air pressure, the shutters close and the doors below the fans close.  This blocks air into the rads and effectively stalls the fans so that take less HP to turn.  Once the coolant warms up, the shutters open and the doors open, and the fans work again.  One door on mine sticks, and the system started to leak air, so i blocked it off.  I'm not going to re install it.


1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Tatamagouche, Nova Scotia
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