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Old 10-11-2010, 02:18 PM
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Do I need a cowl for an electric fan?

I have a radiator that's 25"x24" and I bought a new electric fan for it. The biggest I could find was a 16" diameter. Question: Do I need a cowl for it or do I just need to be sure its mounted as close as possible to the radiator?

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Old 10-11-2010, 02:34 PM
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The performance of the fan would be greater with a shroud/cowl, I suppose it depends on your application, if you find yourself short on cooling without one then you may need to address this. A good portion of electric fans come with shroud and fan/motor in one assembly. Ideally a full rad shroud provides the best combo.
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Old 10-12-2010, 11:55 AM
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Custom10 is right on the money. It all depends. In some cases the fan alone might do the trick. In other cases, a shroud is necessary. If the area is easily accessible and you can build the shroud later without removing a lot of stuff, then try running with just the fan for a while and watch your temp gauge under all the various driving conditions. It will tell you pretty quickly whether or not you need a shroud. If major surgery would be needed to fit a shroud, then you might want to do it right up front. It can't hurt.
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Old 10-12-2010, 12:27 PM
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Quote:
Originally Posted by sunbelt57
I have a radiator that's 25"x24" and I bought a new electric fan for it. The biggest I could find was a 16" diameter. Question: Do I need a cowl for it or do I just need to be sure its mounted as close as possible to the radiator?
Good idea, the intent of the fan shroud is to enclose the perimeter of the radiator's core ahead of the fan. This allows the fan to lower the air pressure behind the entire core which then causes, or results, in an airflow across the entire surface area of the core. This is done to enhance stopped and low speed cooling. Once motion is up to 20 mph or so there is sufficient ram thru the grill that the fan should no longer be needed.

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