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post #1 of (permalink) Old 07-04-2002, 01:36 PM Thread Starter
 
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electric fan in-front of radiator, doner car? + ?

i'm swapping out my front-clip and now i don't have room for an engine drive fan, and very little room for a electric fan.
so, i'm thinking i'd like to get a pusher and mount it between the grill and radiator......i've got about 24" x 12" & only 2 1/2" thickness to work with.....
i remember seeing a BMW setup that looked pretty good (dual fans)...

does anyone know if i can change the rotation of any fan motor? i'm thinking i could put the fan blades on backwards and reverse rotatation to turn a puller into a pusher.......?
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post #2 of (permalink) Old 07-04-2002, 01:41 PM
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Re: electric fan in-front of radiator, doner car? + ?

Now I'm not completely sure about an electric car fan, but I assume the reverse the direction you could simply reverse the polls and get it to spin the opisite direct just fine. I know this works with any motor I've messed with so I think it'll work just fine for that.
post #3 of (permalink) Old 07-04-2002, 03:38 PM
JesseA
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Re: electric fan in-front of radiator, doner car? + ?

True, but most fans that Ive Ever seen have an airfoiled shape to them, so they would be way less efficient if they spun backwards. but then again you might ba able to flip the fans around too....

Jesse
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post #4 of (permalink) Old 07-04-2002, 07:14 PM
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Re: electric fan in-front of radiator, doner car? + ?

reverse the poles and flip the fan. this can still cause some cooling problems at highway speeds becaus the fan can interupt the natural airflow through the radiator.
post #5 of (permalink) Old 07-04-2002, 07:39 PM
 
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Re: electric fan in-front of radiator, doner car? + ?

The fan that I use on my aquarium wont spin backwards with the poles reversed. I tested it yesterday, because a supplier said that it wouldn't. I had to see it for myself.

It is a brush-less version. The commutation is done electronicly. So, in a nut shell, if your fan is brush-less it will depend on how they chose to design the commutation circuit. Not to mention what was said earlier about a fan's ability to move air when spun backwards.
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post #6 of (permalink) Old 07-05-2002, 04:59 AM
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Re: electric fan in-front of radiator, doner car? + ?

One of my buds has an 8 bay garage and he was cleaning out "stuff" and trashing it all, in the mix was a dual volvo fan set up, on the motor was the directional arrow, well, on alot of DC powered motors if you reverse the wiring the motor will also reverse direction. I snatched up the fan setup and tried it and it will run in either direction, hope this helps out, later.

Bird
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