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HybridZ

Ross' Sleeper Z


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I've also seen folks with modified fan shrouds. In my mind adding cutouts/flaps and especially louvers should be avoided unless you know you need them.

 

You want all the air that the fans are moving to go through the radiator. Adding louvers shortcuts the flow path by allowing air from the hot engine bay to recirculate through the backside of the shroud then again out thru the fan housing, bypassing the radiator and reducing the cooling system efficiency. Adding flaps seems better but only if they actually seal, otherwise they just add another potential leak path. Anyway, thats my $0.02 on the subject.

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