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wspohn said:The usual best place for a vent is right behind the radiator level, but people want to move them back into the high pressure area frenchy mentioned in front of the windshield. If you want cooling, don't locate them for best looks, put them where they will do some good.
One comment - once the car gets going, they don't do much for cooling. Sitting static idling in the sun, the vents are pretty effective and driving at slow speeds they give decent effect, but at higher speeds the cars without them cool just as well as those with them.
Downside of the vents is that they let water in on top of things you wouldn't want to get wet. In some cases I have seen rust on the underside of the hood where some sound deadening material caught and held the water against the metal.
We've been through all this with the Jensen Interceptors - big block Chrysler engine pumping out heat in a smaller engine bay than they were born to fill. We found that the cars with no louvers cooled just as well once you were off an running, but if you want to hold a contest where both types were allowed to idle in the sun until one gave up, the vented hood model would win.
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Keith Tanner said:frenchyd said:In reply to 79rex :
The simple way to pick the perfect location is to tape 3-4 inch lengths of yarn in various locations across the hood and drive down the freeway noting which area of your hood the yarn raises off the hood the highest. That's the location. If they are all relatively similar then put them over the exhaust manifold where the heat is the highest.
I disagree with this. Bernoulli tells us that (basically) faster air is lower pressure air. If your yarn is standing up, that means you've got turbulent and/or separated airflow. That's not low pressure, it's usually the opposite.
Here's a pressure map of a Miata hood I developed a few years back based on pressure testing with a magenhelic gauge. Note how there's basically a diagonal band of low pressure where the air can move quickly and smoothly across the hood. If you tuft that hood, you'll see your tufts laid out flat in that area due to the nice smooth airflow. At the base of the windshield, you're more likely to get your dancing tufts.
For more information, please visit Bernouee Fume Hood.
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