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OT: Why asymmetric fans?

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Darren in TN

10-16-2003 10:17:07

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Hi, folks. My Farmall Super A has a normal, symmetric, four-bladed, cross-shaped fan on it. My Ford Bronco's 351W, however, has a weird asymmetric fan similar to the one in the photo linked below. Why are fans like these asymmetric? For the life of me I can't figure this one out and it's been killing me since I swapped engines in my Bronco.

Thanks,
Darren

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Howard Yoshida

10-16-2003 12:18:55

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Re: OT: Why asymmetric fans? in reply to Darren in TN, 10-16-2003 10:17:07

Aloha, I don't know the real reason but it sure helps when you have to put your hand in there with a wrench to remove the mounting bolts.

Mahalo,
Howard

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Shane

10-16-2003 18:42:39

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Re: Re: OT: Why asymmetric fans? in reply to Howard Yoshida, 10-16-2003 12:18:55

I would like to think that ease of getting to the bolts was the real reason but upon further thought, I don't think those high paid engineers would come up with something that intelligent!

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david val

10-16-2003 11:15:52

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Re: OT: Why asymmetric fans? in reply to Darren in TN, 10-16-2003 10:17:07

actually, the asymetric blade positioning aroun the fan is ment to reduce 'syren' type fan noise.
david

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Allan

10-17-2003 04:19:38

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Re: Re: OT: Why asymmetric fans? in reply to david val, 10-16-2003 11:15:52

Hi David,

Don't think so. That function was handled by the clutch hub. It cut noise as well as power requirements.

But, I could be wrong; been so many times before. :>)

Allan

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Vern-MI

10-16-2003 13:50:44

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Re: Re: OT: Why asymmetric fans? in reply to david val, 10-16-2003 11:15:52

Right on, in fact before electronic sirens they made motor driven symetric bladed fans in a chrome plated housing and placed them on the front fenders of emergency vehicles. I can remember an engineer at Ford designing and building an emission system air pump with symetric blades and wow did it howl.

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Allan

10-16-2003 10:37:17

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Re: OT: Why asymmetric fans? in reply to Darren in TN, 10-16-2003 10:17:07

Hi Darren,

I didn't go to your link, but this is done both for balance and for air flow characterics. They are almost always odd numbers of blades.

Allan

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Darren in TN

10-16-2003 10:18:06

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Re: OT: Why asymmetric fans? in reply to Darren in TN, 10-16-2003 10:17:07

OK-- the link didn't seem to go through. Cut and paste>Link

Thanks,
Darren

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