Pulley Diameters

a little packing tape from the outside for testing...clear stuff so no one can see it :p:D

the scoop is effectively blocking an area of the radiator approximately equal to the scoops frontal opening size.
its putting air under the hood that did not pass through the radiator and provided no cooling. not what we want in the desert:D

If its not "sealed" to the carb/intake an open hood scoop is just stealing air that should be going through the radiator.

I know I still have my fluid dynamics textbooks somewhere...physics hasnt changed that much since the late 70's...has it?:(:D
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I have found this to be right on !!