Join Date: Dec 2000
Location: Monroe, WA, USA
i think he ment between any motor driven fan and an electric fan.
some maker's claim up too a 40 HP differance, but i have seen chasie dyno's give 12 to 20 HP more with an electric over a motor mounted fan.
i belive there is a great diferacne between flex fan's and clutch fan's just do not have any #'s. all the expert's say a clutch fan is the best of all the motor driven fan's, they take less HP to run and add less stress to the water pump.
the 3 to 5 HP for an electric fan i do not know about. most electric fan's take up to 30 amp's at start-up then drop to around 10 to 15 amp's when runing.
some monster OEM dual electric fan's take up to 60 amp's starting up and 30 amp's runing.
i personaly belive that the impact on the motor is almost not mesurable, as an alt is going to be running anyway. and if it is 3 to 5 HP that is not gona impact you any, heck you would never be able to feel the power loss, and as for the impact on speed and stuff that is basicaly not there at 3 to 5 HP.