Quote:
Originally Posted by HWYSTR455
A fan can block air flow on the highway and not at idle. Blade design, shroud, etc, can all effect flow across the core at different speeds. It's best to have a shroud design that has pressure reliefs if the area of the fan doesn't cover 80+% of the core.
Another thing, running an electric fan over like 50 mph does nothing for cooling, and it can block more flow than not running. As an example, if a fan moves 3000cfm, and at 60 mph air flows through the core at 5000cfm, where does the rest of the air go? (don't ponder that too hard, it's just an example)
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And I 100% concur with this. I'd go so far as to say once you are over about 25mph the fan is beginning to be more a restriction than help if left on.
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