Cracker, good question. I'm NOT going into the differences and advantage or disadvantages ESPECIALLY not comparing a lowwwwwwwwwwww speed tractor to a high speed vehicle, but will just take an engineers perspective to your question:
"said they gain some more HP and is more efficient for the engine".
Not sure how much HP IF ANY is to be gained from using an electric fan, its certainly NOT any free energy device. It takes engine HP to turn a fan if its belt driven and it takes engine HP to turn an alternator to power a fan (via battery) if its electric WELL DUH. I just don't see much if any HP gain by using an electric fan versus belt driven.
Also an engine may be more efficient once its up to operating temperature, say 180 T stat setting. When cold it may not be as efficient so regardless if a belt driven fan or an electric fan controls the temperature and so long as the most efficient temperature has been achieved WHATS THE DIFFERENCE IN HP REGARDLESS OF A BELT DRIVEN OR ELECTRIC FAN (subject to if electric is more or less efficient then belt driven)
AGAIN (before anyone has a calf) this does NOT consider dirt or dust or air CFM air flow and speed etc etc. I'm ONLY considering belt driven versus electric (alternator and battery) driven in a low speed tractor IF ALL ELSE IS EQUAL AND MOST EFFICIENT TEMP IS ACHIEVED I don't see much HP gain
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