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One factor is the weight of the fan fan/clutch assembly.
The jeep wagoneer / grand wagoneer with the 360 v8 from the 70's have a very heavy combo of about 6 lbs (2.7kg) for the 19" fan diameter and 7 blades. I replaced mine with from an early 80's mercedes 560 sl which is 18" diameter but has 9 blades and weights 4lbs (1.7kg) because the fan is alumimum not steel, and has some fancier curve on the trailing end of the blades. Both fan clutch have alsmost the same weight 2lbs 10oz and 2lbs 3oz.
I tried to calcutate the linear and angular velocity to determine loss of HP, which of courses does not account for the fan clutch activation, but both fan combos have the clutch, so the limiting factor could be assumed to be the weight, albeit the jeep fan is steel all around and larger, and the mercedes is a lot lighter on the perimeter so the momentums are different.
the link is algebralab.org/lessons/lesson.aspx?file=Trigonometry_TrigAngLinVelocity.x ml
So between 4 and 7 hp was the result, which does not take into account that at some point the clutch partially disengages the fan.
Indeed a tach could be used to determine the speed of the fan under different temperature conditions, but I have not tried to find out yet -this v8 is not a commuter-
A few people have tried to go electric but those vehicles when used for what was their original purpose, which is slow speed on rough trails, will invariably run to the limit of overheating, albeit the taurus or contour dual speed fans seems to be successfulll but need to have a larger alternator -creating more drag- and some rewiring.
cannot post links yet, I have been a lurker for too long
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