My experience was building a fiberglass reinforced engine lid made out of 1/8 inch wood wall paneling 4 inches high with 3 radiator fans sucking air out of the engine cover.
My theory on this is that as the air rushes over the top of the car a vacuum is created behind the rear back glass/engine cover area causing air to move upwards..
I decided on my design because I didn't think one fan would move enough air whereas 3 fans sucked all parts of the engine compartment not just the one over (under in ya'lls case) the I.C.
Later I designed a huge scoop that blew air down onto the I.C. (and which allowed me to fill it with ice before the race). Unfortunately at 140mph the scoop was too large and disappeared one night racing flat out on the Florida Turnpike.
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Originally Posted by Jackstand Queen
I have a question: should the fan mounted under the IC suck air from above the engine lid, or should it blow air up through the vent in the engine lid?
Experience based, or theorhetical explanations are requested.
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