I read a car craft article on time where they dynoed a sb chevy with a clutch fan vs a fixed fan vs an electric. If memory serves the fixed fan lost 15hp from the electric and the clutch lost about 7 from the electric. Sounds like a lot of extra money and hassle combined with sub-par cooling in many cases, just to gain a few hp.
My HHR fan cost less than a new mech fan and clutch would cost. If i have gained 5-10 hp for less than $100, i feel like i got a good deal. http://www.network54.com/Forum/215655/message/1066184641/Car+Craft+Cooling+Fan+Dyno+Test http://www.carcraft.com/techarticles/ccrp_0311_drivetrain_power_loss/viewall.html
