5 blade or 7 blade fan: what's the dif? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-27-2005, 04:48 PM
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What's the difference between a 5 and 7 blade fan?

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Last edited by pigjamelectric; 07-30-2005 at 06:29 PM.
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Old 07-27-2005, 05:57 PM
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uh... the difference is two blades.

K
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Old 07-27-2005, 06:27 PM
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Yep! Two Blades difference, LOL And it also moves a little more air.
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Old 07-27-2005, 08:35 PM
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A 5 blade fan allows a certain amount of air to circulate around with the fan. A 7 blade does to but not near as much.
Picture it this way. The blades create a high pressure area at the leading edge that pushes the air between the blades in a circular motion. A seven blade doesn't have as much area between the blades thus flow more air.
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Old 07-28-2005, 08:19 AM
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Too the poiint that air can't get in front of the blades.


It's really hard to beat a GM four blade for high fan air.
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Old 07-28-2005, 09:12 AM
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Quote:
Originally Posted by killerformula
uh... the difference is two blades.

K
Erik, you **********
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Old 07-30-2005, 06:28 PM
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The blades seem to be the same size and pitch. I'll go with the seven blade.

Thanks for the replies guys.

Paul.
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