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How many CFM does a crank driven fan pull?
It's proportional to RPM. That's why constant speed electric fans can't replace it. Either they are far overpowered under most conditions or they don't deliver when you really need it. Usually the latter...
where does the power to drive your electric fan come from?
Yes but the alternator is already running off the motor if you have the fan or not. My point is your just eliminating some rotating mass from the motor hence making more power. I have never even come close to overheating with my electric fan. I offroad from time to time and even sitting mostly still with the motor just revving it doesnt get hot. My fan has not hurt my cooling system at all so thats the only reason im posting this. I keep hearing its gonna hurt your cooling but I have yet to see were you get this from. I do a lot of heavy hauling and slow speeds from time to time and still the motor doesnt get any hotter then when im at no load just city/highway driving.
Are you sure about that? Tried any 12000 foot summer desert climbs with it?
I dissagree with you here. Your altinator is still rotating at the same speed whether you have a mech fan or electric. The increased load doesn't place a segnificant load on the engine to consume more fuel. Don't get me wrong I'm not defending the electric fan, just pointing out that for arguements sake an altinator rotating at 2500 RPM is going to put the same load on the engine whether or not its running an electric fan.
I don't think its a missunderstanding, your altinator is still producing the same amount of power ( at the same RPM ) regardless of whether or not your running an additional load. Again I'm not defending the electric fan, just pointing out that the claim of the increased power requirement placing a greater load on the engine is false. If you go by the manufacturers claims of freeing up 10 - 15hp ( I could be wrong on the actual claim, whether its true or false I have no idea) if it even freed up 10% of that claim, and you ran a stock alt, at most the load increase on your engine would be what...720 watts ( 60amp X 12V )? A HP is 746 watts if memory serves. IF my maths right you would be saving something. Not that you'd ever notice a difference, it looks good on paper...lol.
What do you want an electric fan for? How big an engine do you have? What other alternatives have you considered ( e.g. have you considered running arad from a 4L if you have a 4 banger, never done this but always wondered how well it would work. Have you considered a coolant additive? They will keep your engine running cooler, keeping your mech fan running less often saving in fuel,etc.)?
For one I don't live in the Desert. Temp guage read 180-190 all summer, idleing in +100°F weather. The fan was set for lowspeed only.
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