Radiator clearance help
If I understand this at all (which some may think is questionable), the move to clutch fans in performance cars wasn't because they cool better, but because they don't soak up as much horsepower. Of course, because they don't, you can run more blades, which I suppose would cool better, without a large horsepower penalty. Anyway, here's a chart I pulled off the internet a while back, showing how much less power a clutch fan soaks up at higher rpm.
If I understand this at all (which some may think is questionable), the move to clutch fans in performance cars wasn't because they cool better, but because they don't soak up as much horsepower. Of course, because they don't, you can run more blades, which I suppose would cool better, without a large horsepower penalty. Anyway, here's a chart I pulled off the internet a while back, showing how much less power a clutch fan soaks up at higher rpm.
