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The engine side vents are for intake air feed on one side
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(direct to the standard airbox), and to the cooling fan with cowling on the other.
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I was not under ht impression that they provided
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(from the standard design of the body), meaningful engine bay cooling.
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That is from underneath the the engine bay, and signified by the slightly up-turned plastic undertray under the fuel tank area.
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My opinion on the TOM's scoop
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(when not used with its specific airbox) is that it will not help, and may even hinder cooling, as it just introduces another airflow path directly into any airflow coming from the side vent.
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Since cooling is about improving airflow through the engine bay, this turbulence isn't helping anything.
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.
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The effectiveness of a complete flat floor is not optimised without a huge rear diffuser, front splitter
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(practicalities on a road car?) plus ride height alternations.
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I suppose you can do it for the hell of it, or if its a competition car with many other aspects of the vehicle focused on track performance, but otherwise I'd rather not risk engine heat build up and reliablity for the sake of a changes of unproven benefit, and limited effectiveness on the road and lower speed tracks.
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As an example, the VX220
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/ Elise has a flat undertray
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(with naca ducts underneath the engine bay for ventilation) and requires a large diffuser and front splitter to achieve any meaningful reduction in lift, and then its only effective at speeds of
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+70-80mph.
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It also make it a bit more of a PITA to access the underside of the engine
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/ gearbox.
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