Quote:
Originally Posted by synolimit
Further forward the better. Further back you actually hurt the car as you block off the air moving through the radiator. The back air is actually sucked out of the engine bay and under the car. Airs trying to go through but it's hitting a wall of incoming air from the back. This is why the Evo, new corvette etc all have the vent as far forward as possible. Its a high vs low pressure area thing. These hoods with all the venting and huge openings all over probably do more harm than good. Its just a show peice. Hotwheels didn't use a multimillion dollar wind tunnel like Chevrolet did.
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Good post but I would also consider that different style vents will have individual perks at different levels of airflow/speed. Whether the consumer matches the airflow modifications to their application or not, or even has the information to do so... probably not in most cases. But we can at least be fairly certain there is another dimension to it.
Example, I am personally guessing that the vents of larger surface area, regardless of consideration to placement, should allow more heat to escape in applications such as idle, auto-x, and other "low speed" environments where there is not enough airflow to achieve a venturi effect or buildup of air pressure at the cowl. What speed these events occur, I have no idea. But I would say that there is probably a changeover that occurs somewhere on the speed axis where the style and placement of the vents needs to begin shifting to avoid areas of high pressure, or other concerns that I am unaware of.