Clutch Fan Vs Electric Cooling Fan

[lappy32]

which volvo fans are better?

[stilettoman]

The only overheat problems I ever had were in the 5.0 Ford powered RX-7 I built, and after trying several different solutions, I ended up with the stock RX-7 plastic fan, which seems to have excellent aerodynamic design, running without a clutch. Of course it never revved very high driving on the street with an automatic, so I don't think the fan was eating much horsepower.

My RB20 powered RX-7 runs very cool with the stock Skyline radiator and clutch fan, even in 100 degree F weather. Of course I realize the 2.0 liter motor does not generate much heat in normal street driving. When we recently did the RB20 swap into the 48 Studebaker, we tried to make it fit with the clutch fan, but it was just too crowded, so we installed an electric fan - it is fairly quiet and really moves a lot of air. I think the latest designs of electrics must compare favorably with an engine driven clutch fan - they get smarter all the time, just like the guys designing the turbos.

http://www.summitracing.com/parts/flx-398/overview/

[shadow21189]

VERRY DEBATEABLE.. I prefer the viscus fan as the fans clutch operates on a heat sink clock spring. so when it is heated it locks to a degree and spins at the engines speed which in my opinion is optimal with a fan shroud. I have tried twin thermos with a fan shroud and didn't realy notice much difference at all other then the fans switch drawing a bit of extra current which can put a little extra strain on the engines alternator.. though I have tried this in a car primly set up for drift and being a high reving engine at lower speeds found the viscus fan to be much better but if your just spirited street driver if you can put up with the annoying howl of the thermos switching on and of periodicly then I say go with thermos