Quote:
Originally Posted by DonR
The one on my Jeep is turned around with the opening facing the windshield. Works wonders.
When it's turned around it works just like a cowl induction hood.
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I've been meaning to invest in an after market cover for the air induction vent on my Jeep for awhile now. Most owners of Jeeps in my area (and there are a ton of them) always face them with the cowl opening facing the away from the windshield, because they mostly drive at slower speeds, being city driving or off road. At slower speeds the air moves into the cowl by the movement forward, but at higher speeds the air will "dam" up the opening, just causing air to not enter the cowl as freely. For higher speeds, with a taller cowl cover facing the windshield, this is going to keep the air from damming the opening, and because the taller cowl is going to create turbulence, much like that of air passing over a car with a wide, blocky rear end. The air is going to want to do the same when it passes over the cowl, thus more willingly enter the air vent.
This is an after market one from Bushwacker for a YJ series Jeep Wrangler, but you get the general idea. These are super easy to make as well if you have a plan and know what to get from the hardware store.
Overall, I'de say depending on what driving you do most, depends on which way you want that opening of the cowl to face.