Re: Mechanical Fan or Clutch for bbc serpentine
Flex gans are always turning as they do not have a clutch.
It takes power to pull air. Yes, they do flatten as rpm goes up, but they still pulling power.
Clutch fans take power only when engaged whether the clutch is rpm controlled, meaning the higher the rpm, they become disengaged, but always engaged at lower rpms, or thermal controlled - have a bimetal spring in the front, and engage when the ambient temperature through the radiator is high enough expanding the spring engaging the clutch. Once cooler air comes through, the fan disengages.
Also, thermal clutches are generally rpm controlled as well. Usually above 3000 rpm, thermals disengage.
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