Vented Hood Water Question

wheee!

That hood design is almost 'over-vented'... I prefer the JP-R hood for effective venting with minimal water intrusion...

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JWillis72

The vents are big on my hood but I was looking for max air flow for cooling on the track not looks and it does a great job at that.

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Arrvaxx

I feel like those vents are too far forward. Sure, they vent the air coming out of the radiator but they don't do anything for heat further back.

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wheee!

My car is NA, but those vents on the sides sit just in front of the headers behind where the stock air boxes go. The centre vent is slightly behind the rad and before the coolant overflow. The heat coming out of those is crazy after a long drive. I have also had rain gather on the hood while at a stop light. As soon as a pulled away, the rain literally shot out of the hood with the force of the air coming out of the vents.

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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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13 370z-

phunk

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.

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Rusty

Yep. The base of the windshield is a high pressure area. That's how cowl induction hoods get their air for the intake. If the vents are at the very rear of the hood. Don't think they would be good at moving air.

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