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Old 02-19-2012, 11:41 AM   #44
VWNate1
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Join Date: Feb 2012
Location: So. Cali.
Posts: 2,610
Post Re : Topic Drift : Fan Efficiency

You needn't run any fan clutch , just be sure to shim the fan so it's 1" from the radiator core to ensure it's drawing air through the radiator at low speeds or when idling in traffic .

Lucky for us , the fan spacers are standard bolt spacing so they're available cheaply new or nearly free in junkyards .

These thin wall L6 engines really don't ever have overheating problems unless something is seriously amiss , ignition timing far off or rust & scale clogging the radiator tubes or silt in the water jacket from long disuse ~ cleaning is dead simple : use Citric Acid powder mixed one pound per gallon of distilled water and drive it to work and back for a day , the amount of crud that comes out when you flush this will amaze you . far better than any flushing stuff in a can from your FLAPS and cheaper too .

Flex fans are very nice as they not only give back a tiny bit of power but they're also very quiet .

For hard working Desert rigs , delete the fan and replace it with an electric fan , use a relay and temp switch in the thermostat housing , wire it live so it can switch on and prevent heat soak .
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'49 3100 235 W/ Muncie SM420 SOLD
'69 C/10 shortbed sidemount survivor 250 L6 W/ 350TH
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