Electric Fan in OEM Shroud Help - Chevy Nova Forum
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Old 31st-July-2019, 09:29 PM   #1

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Electric Fan in OEM Shroud Help

Hey guys and gals, need some brainstormed ideas.
I was planning to use just a stock fixed blade fan on my build but came across an episode of Engine Masters that showed fixed fans can cost about 30hp.

I have a stock shroud and a no name 16" electric fan.
I dont like slapping these fans dirrectly on the radiator.
So this is what I came up with. Only problem is it seems to be pulling a decent amount of air from the area arpund the edge of the fan. So I'm trying to think of a way to fill that voide in a way that looks good.

Any ideas appreciated.

I miss drilled my top left hole and had to adapt, so yes, it does look a little off.
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Old 12th-September-2019, 02:01 PM   #2
kevin temple

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I question fan dragging 30 hp. from engine. Purpose of fan is to cool radiator at idle. At speed, ram air, car pushing air through radiator will keep engine cool. Is there a road close by you can cruise at 45-50 mph? Take fan off, drive car to find out if hp drain noticeable. Yea it takes hp to operate stock fan, p/s A/C. Just depends on what you want engine to do, daily driver or racing.
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Old 13th-September-2019, 09:35 AM   #3
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All depends on the setup and the car. Sometimes electric fans rob HP over the stock fans. It can go both ways.

If you are using an electric fan and it is not almost or completed enclosed in a shroud, you are not using that fan efficiently.
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Old 13th-September-2019, 11:10 AM   #4

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Ive heard of guys using a cookie sheet the size of their radiator and using it as a fan shroud. They cut out the diameter of the fan and mount the fan to the "shroud". I found a couple on amazon for less than $20. I also thought about trying to use the stock shroud but you do need to seal the fan to the radiator so it pulls air through the entire radiator or it wont work the way you want it to.
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Old 13th-September-2019, 04:04 PM   #5
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The fan as mounted isn't going to pull much air through the radiator. The air being pulled through will pull air with the least resistance so there's going to be a lot of air from the engine compartment rather that the radiator fins. You would have no problems once the road speed is sufficient to push air through the fins. If you want to use that shroud then remake the mounting straps to move the fan as close as possible to the rad. I wouldn't let it touch the rad though because the fins can get damaged for constant rubbing . If the fan was mounted as designed(tight to the rad) then there is no movement therefore no rubbing. The 30 hp is at wide open throttle I suspect. Are you driving at wide open throttle very much? The parasitic lost at lower rpms is lower but the engine is running cool(if everything is correct with the engine and the cooling system). I personally like a GM flex fan with a shroud with a clutch fan and shroud as my next choice. Also there are some good electric fans and many of the best incorporate their own shroud. I'm currently running an electric fan from a Ford Contour(new from Summit Racing). It's doing an excellent job of cooling my engine.

There are problems with the cookie pan with a hole cut in for the electric fan. Yes it's pulling air through the rad fins but not too much towards the corners of the rad. (path of least resistance thought comes to mind). Then at faster speeds when the air can be pushed through the rad there is blockage from the flat area of the cookie pan. Flaps can be installed to allow some air to pass at speed and close at slow speeds but in both cases it's not an ideal situation.
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Last edited by Shane65; 13th-September-2019 at 04:11 PM.
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