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Old 08-09-2005, 08:18 PM
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CFM ratings

How do I go about figuring what cfm fan I would need to cool my engine? There must be some sort of formula correct.

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Old 08-13-2005, 09:30 PM
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If you had an engineering degree and could collect all the parameters you needed, yes there is a way to calculate the value. However, cut and try is just fine for hotrodders. Get it fixed in your mind that 99.999999999% of the cooling problems rodders run into are due to inadequate air flow. Once you get your brain around that concept, the fix is easy. Use a good basic mechanical water pump and put all your efforts in the fan. A stock fan w/ thermo clutch and shroud is best. Second best is THE BIGGEST CFM FLOWING FAN you can get that will fit your radiator set us as a sucker with a shroud is a close next best. Third best is #2 without a shroud. Absolute worst case is any fan set up as blow through on the front of the radiator.
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Old 08-14-2005, 09:25 AM
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Willys I currnetly do not have a issue with cooling. I run a 18" flex with shroud but I was just tossing around the idea of running an electric, which would be used as a puller. Thought maybe there would be some formula to get me close.
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Old 08-14-2005, 12:48 PM
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Generally, you cant really go too big when picking an electric fan.
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Old 08-18-2005, 10:06 PM
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Quote:
Originally Posted by Siggy_Freud
Generally, you cant really go too big when picking an electric fan.

True, true. There are three very important rules when designing a cooling system;
  1. Air flow
  2. Air flow
  3. And most importantly, air flow
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