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03-13-2011, 12:45 PM

TheYellaBrick

Senior Member

RACING JUNKIE

Join Date: Mar 2008

Location: Emmett, Idaho

Posts: 7,334

Cowl INduction...opening is at a VERY HIGH pressure area at the base of the windshield. Air flow does NOT occur OUT of the cowl INduction scoop, it goes IN the scoop creating a high pressure area within the airpan sealed carb INtake space.

There can also be parasitic drag from the cooling air-flow through the radiator, past the engine package, and out the BOTTOM of the engine room. The higher the vehicle speed the greater the 'air flow dam' of engine room air trying to 'join' the under car airflow. Hence creating a low pressure vacuum UNDER the car via front air dam and side skirts GREATLY increases cooling air flow efficiency/cooling efficiency.( the reason there are mini air dams under the bumpers of pickups, vans, and most cars produced today) Any of THAT air that gets into the induction system will INCREASE the intake charge temperature through the air/fuel management system.

There can be a 20 degree ambient air temp difference from 1 inch off the pavement and 24 inches off the pavement, higher being cooler.

An interesting article about aerodynamic drag on different shapes;

http://insideracingtechnology.com/tech102drag.htm

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