My 87 iroc had elec fans from the factory. But one of the previous owners put a flex fan into it. I dont know why,,id say the elec. ones must of cra*ped out. But i was wondering how much power am I loseing because theres a reg. fan there instead of a elec. one????

 

It might surprise you how much...maybe as much as 15-20.
Car Craft did a dyno test of several different kinds of fans seven or eight years ago (mebbe more) on a 450 or 500 hp engine; and a flex fan 'used' about 40 hp (at that level) IIRC compared to using no engine-driven fan.
I used a flex fan on my SC after swapping the V8 into it and just put an electric unit into it last spring. That change, plus switching to a functional cowl hood netted me about a .4 second decrease in ¼-mile ET....from a 14.895 to a 14.494. Plus the 1½-2 MPG increase didn't hurt, either

Pete

 

The car craft dyno test was exactly that, a dyno test--not in a car. Running any fan without a shroud will make the fan much less efficient. Also, once you get moving, the air already moving through the radiator(from the air dam) is helping the fan. The faster you go the less power it takes to turn the fan. I've seen rear wheel hp tests that do show a gain in power going with electric, but at the track they both ran the same. To me, the advantage of an electric fan is that it runs full force idling around town--keeping things nice and cool.

 

thats why i like eletric fans, full strength when they are on..