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Old 12-03-2012, 01:08 PM
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Electric Fan Crearance

How close to the radiator fins should the blades or shourd be mounted ? It's a pusher fan going into a 36 Ford with a small block. Theres a very small shroud around the blades.

Thanks, guys !


454 RATTLER

My Spell Check didn't catch the misspelling of the word Clearance in the title !! Sorry about that !

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Old 12-03-2012, 02:56 PM
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Quote:
Originally Posted by 454 Rattler View Post
How close to the radiator fins should the blades or shourd be mounted ? It's a pusher fan going into a 36 Ford with a small block. Theres a very small shroud around the blades.
Thanks, guys !
454 RATTLER
My Spell Check didn't catch the misspelling of the word Clearance in the title !! Sorry about that !
Just tell 'em you were munching on a brownie when you said it....
Never did what you are proposing. Never needed to because I will only use crank-driven fans. Snow White makes a short water pump for the SBF and it should be possible to mount the radiator a little further ahead with some tinkering.
If I were going to though, I think I'd mount a full shroud on the front of the radiator with two holes in the shroud for two fans. If I couldn't find a commercially-available shroud, I'd fabricate one from sheet aluminum and pop rivet it together.
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Old 12-04-2012, 12:46 PM
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Quote:
Originally Posted by 454 Rattler View Post
How close to the radiator fins should the blades or shourd be mounted ? It's a pusher fan going into a 36 Ford with a small block. Theres a very small shroud around the blades.

Thanks, guys !


454 RATTLER

My Spell Check didn't catch the misspelling of the word Clearance in the title !! Sorry about that !
Pusher fans lack effectiveness, the area they cover against the total radiator core area is pretty small. The idea with the shroud is to promote some siphon flow around the outside of the shroud by the pressure reduction of the air exiting the fan. This isn't as effective as it needs to be. The most effective set up is a puller fan on the engine side sitting at the exit of a shroud that seals the perimeter of the radiator. This develops a low pressure area behind the core so air flow will occur across the entire surface area. This level of efficiency is not considered visually attractive so is seldom seen on street rods. Cooling of these machines just continues to be a problem.

Bogie
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Old 12-05-2012, 04:02 AM
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Is this fan labeled as a "pusher" or is it a puller that you turned the blade backwards to make it a pusher?
Reason I say this is you want a true pusher fan like a Spal. They work very well and had one on my 600HP motor for 9 yrs with no problems.
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Old 12-05-2012, 06:37 AM
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Several Dual Fan Shroud styles here >> dual fan shroud kit - Bing Images
With Fans mounted high & low it will give more clearance between the Pulley & Rad.
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Old 12-05-2012, 05:04 PM
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Wouldn't a shroud on a front mounted pusher fan be counter productive in that it would limit air flow when the car was moving down the road?
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Old 12-06-2012, 08:11 AM
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Quote:
Originally Posted by bob70 View Post
Wouldn't a shroud on a front mounted pusher fan be counter productive in that it would limit air flow when the car was moving down the road?
Thats what I was thinking too.

This is a new Spal fan. I still need to know how close to mount it to the radiator.

Thanks !


454 RATTLER
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Old 12-06-2012, 08:40 PM
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I don't know if there's any "rule" on that but I'd get it pretty close being sure to leave enough room to allow for a small amount of flexing and still not hit the radiator. Maybe 1/2 inch?
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Old 12-09-2012, 07:49 AM
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Wouldn't a shroud on a front mounted pusher fan be counter productive in that it would limit air flow when the car was moving down the road?
Yes, a shroud on a Pusher would block airflow.

X2, on the mounting clearance, leave room for Blade flex.
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Old 12-11-2012, 11:31 AM
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Originally Posted by sunsetdart View Post
Is this fan labeled as a "pusher" or is it a puller that you turned the blade backwards to make it a pusher?
Reason I say this is you want a true pusher fan like a Spal. They work very well and had one on my 600HP motor for 9 yrs with no problems.
You don't turn blades on electric fans, you reverse polarity on the leads to change direction.
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