Thread: Electric fan control

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That's the nice thing about this car hobby. There are so many different ways to do things and so many diverse opinions of the "right" way to do them...........but somehow the cars seem to still go down the road and function as they should.

Don

Originally Posted by jerry clayton

....but running without side panels on your hood can cause a turbulance that will destroy the effective differential pressure at the radiator and kill air flow---the best is hood panels and louvers to let the laminar flow down the sides create a suction

Jerry, can you help me understand? You're saying that Don's '27T with the open exposed radiator and engine is OK, but for my '33 Hiboy I may have turbulence around the sides of the radiator that will effectively block flow through my radiator? The only thing that could create any turbulence, it appears to me is tires, headlights and perhaps the splash aprons, but I really don't see much difference between the '27 and the '33 for air flow other than the spash aprons and they only extend the frame about 8". Below is a picture of mine head on, for reference. I'm just trying to understand your interpretation of the physical situation here, and what might be causing this potential air flow problem.

Roger nice pic

Altho I have referanced you in several posts, its because you and I and others were discussing something that you kept referring to as how you did yours instead of the issue in general--sorry if it has appearred that I was down on you---

About the turbulance and lack of flow thru the rad--

Your pic shows the a/c condensor and 4 large brackets that reduce/block flow from the front.
If you look at the pic you will see that the radiator is aprox 50% of the frontal area compared to the firewall/cowl area.
This blunt forward facing area can cause interuption of smooth flow of air front to rear of your car and the buildup of pressure in the area under the hood and behind the radiator.
Even if it doesn't completely stop flow , it will vary with speed and maybe cause overheating as the load goes up.

Do you have underdrive pulleys on the waterpump or alternator??and what is the ampereage you electric fan draw?