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how effective are bonnet louvres?
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[quote][i]Originally posted by Andy[/i] All depends where the vent/louvres are on the bonnet. With most cars moving forwards through air, there is positive pressure at the very front of the bonnet and also at the very rear, near the windscreen. In the middle of the bonnet, there's negative pressure. Louvres in the middle will therefore help suck air up from the engine bay and out. At the very front and rear, they'll not do much. Conversely, a vent or scoop placed at the front or rear will force cold air into the bay, but in the middle, will be pretty ineffective. Square, I will have a bonnet with rear scoop for sale very soon. I found it to be quite effective for directing cold air over the throttle body intakes. U2U me if you want more info [/quote]
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