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DELETED (Inactive)
56 Posts |
 Posted - Jun 27 2004 : 11:01:27 PM
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The BM fan is a popular choice with the Toyota Supra crowd, many of whom are pushing more than 500 rwhp.
Essentially, the "average" experience is that it is inferior to the OEM Toyota clutch fan for cooling performance. Some people who had failing components in the stock system are very happy with the result, but many who did not have problems before started to have serious temperature fluctiations appear once they started to use the electric fan. Most of these are in fairly hot areas, however, some people who live here in Canada have reported problems with the electric fan as well.
Of course the "advantage" of the electric fan is that the fan's rotating mass is no longer directly connected to the crankshaft, which many report results in a free revving engine.
Here's some basic physics, though.
There's no such thing as a free lunch. To move air takes power, whether it be mechanical or electrical.
Electrical power in a car comes from the alternator, which is connected to the crankshaft.
Conversion of power from one form to another involves losses. There are no 100% efficient solutions. So you are converting the mechanical energy of the driveshaft into electrical energy, and then converting the electrical energy back into rotary via tha fan motor. You are actually taking MORE power to move the same amount of air, to produce the same amount of cooling.
Of course the electrical fans can come on at full blast while the engine is at idle, which is good for stop and go city traffic jam driving with the A/C cranked, but the Supra already has auxilliary electric fans for just that purpose. :)
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Engine Cooling
