Electrical vs engine fan

veecee · Post by **veecee** » Sun Sep 23, 2007 7:48 pm

ChemCool wrote:
The std fan has a viscous coupling so it only works at low speeds. Also its a little known fact but any electrical thing robs power as it places a laod on the alternator.
I told you. Running in circles.

i hate to hear you say i told you so!!! or even "i told that he told you so!!!"

and running in circles makes you look silly! and dizzy!

ChemCool · Post by **ChemCool** » Sun Sep 23, 2007 8:29 pm

and running in circles makes you look silly! and dizzy!

Appropriate. Nicely said.

ChemCool · Post by **ChemCool** » Wed Sep 26, 2007 5:10 pm

http://www.speedandsound.co.za/forum/vi ... hp?t=23353

widowmaker · Post by **widowmaker** » Thu Sep 27, 2007 3:58 am

mmm yep no free lunches...

but!

you need a fan most on hot sunny days, eh?

and you wont have to paint your roof black

Hennie Marais · Post by **Hennie Marais** » Thu Sep 27, 2007 8:01 am

The Calibrator wrote:The std fan has a viscous coupling so it only works at low speeds. Also its a little known fact but any electrical thing robs power as it places a laod on the alternator.

There are no free lunches

it loads the alternater, taking power, but that's only when they are on/running. Even with my V8 and the bigger radiator they rarely come on, mostly only when I'm stationary for a long time.

low speed or low rpm? Big difference. The fan works all the time but being viscous means it got only a certain amount of "friction" that makes it turn, so it'll turn up to the speed where the load being created by sucking the air equals the "friction" of the viscous coupling, after that the fan speed stays constant while the engine still revs higher, so ye, it takes power from start to finish but the power robbing stays constant when that equal point are met.