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Old 12-26-2008, 06:44 PM   #1 (permalink)
IkoIko
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Join Date: Jun 2008
Location: Sacramento, CA
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Size of hood vent

I'm thinking the next mod to my Focus Wagon is to vent the cooling air through the hood and then fit a belly pan. I've installed a air dam (here's the air dam) and modified my driving, with the help of a ScanGauge, to average above 30mpg. That includes time stuck in traffic, I hate seeing the 0.0 mpg on the ScanGauge.
This thread was close to answering my question but I don't have room to modify flow after the radiator since the exhaust manifold is only a couple of inches behind the radiator.
I've read the great articles at Autospeed.com and have done some testing with a Magnehelic gauge to find low pressure areas on the hood.
What size should the vent be? Is there a theoretical size based on the size of the grill opening?

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