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Message: <blockquote data-quote="ReplicaR" data-source="post: 902708" data-attributes="member: 9209">I'll explain it again. Fluid cooling is a much more efficient way to bring down temperatures. If that would not be the case, all engines would be exposed from factory, so they would be cooled by the air passing through them. A slight breeze of air will only go as far as blowing some air over surface, which will do absolutely nothing to cool the internals. That's what oil and water are for. If you want to keep the cooling at it's most efficient, then the air is supposed to move right through the heat exchanger (radiator, oil cooler, intercooler, etc.), and get out of the car. The most efficient way to do that is to have a radiator in a tunnel, so it gets all of the air from the front bumper, and expels all of it right out into the open space, preferably some place where it does not get trapped. This is how most race cars work, where the air goes right out of the heat extractor hood, and no part of it actually enters the engine compartment.What you are suggesting is air entering from the rear of the engine bay, and then causing disruption to the flow from the radiator. If you slow that air down, you are reducing the cooling effect of the radiator, because now it does not flow as freely. If you pay attention to even some of the older cowl induction hoods from the 60s, most of the factory setups had the cowl vent blocked off so the air would only go as far as feeding the carb, but never actually entering the engine compartment.</blockquote>