Quote:
Originally Posted by trader4
The problem is the explanations turn out to be "it's different",
"the engine is powering the car too", "it's parasitic." None of those
explain anything as to why that small fan would need an
extraordinary amount of power compared to similar fans.
And note you don't want to address the fact
that with a car moving, air is being rammed into that fan,
greatly reducing the power required to move it. Think about
a windmill.
I've looked for good test data and there is almost nothing. Which in
itself is a curious thing. Because if I were selling electric fans and
trying to convince people to buy them to save 10hp, I'd have some
actual lab verified test data to prove that it does that.
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Okay, I'll try one more time. The "10hp" (is that hypothetical?) you are gaining is with the electric fan off vs. the mechanical fan being driven all the time to some degree. With the electric fan on the hp gain will be less than 10hp. Probably around half. I'll address your point about the car moving now... your engine fan is not ever being "rammed" with air. Your aux fan is since it's is in front of the condenser and the radiator... but your engine fan is most definitely not. Your engine fan doesn't care whether you are on the highway or sitting in idle... your belt will keep driving it at whatever speed the condition of the fan clutch dictates.
The main benefits of switching to electric are the increased durability of all components involved. IE: removal of fan clutch, less stress on water pump bearing/snout, and better control of temps depending on how/when you trigger your fan. A small increase in HP and MPG are a nice side benefit of the swap.
I hope that helps. If not... well... as I suggested, find someone who can explain in a satisfactory manner.
