Purpose Of A Roof Scoop

Hood scoops are for cooling the engine or engine components.

Purpose of a roof scoop.

Getting back to aerodynamics today i explain how hood scoops and bonnet vents work for road and track. The main reason for having a roof scoop on a rally car is to actually pressurise the interior of the car slightly. What are roof scoops for. I have no idea what good a roof scoop could do.

Also on mid engined cars the roof scoop is the air intake. This small increase in pressure works wonders to keep out dust and sand from the rally stage. The only other reasons for a roof scoop are to cool rear mounted heat exchangers radiators or to provide intake air for a rear or mid mounted engine. On a rally race car a small roof scoop creates positive pressure in the cabin pushing dust out of window.

I explain the basics of how the airflow works around. This is because there s a negative pressure created by the vacuum bubble behind the trunk. If the car was a rear engined air cooled engine car like an old vw bug it could be used to force cooling air over the motor. In almost every case a large naca duct will provide more than sufficient airflow without increasing drag raising the boundary air thickness or causing turbulent airflow.

Any dust floating around the cabin will seriously inpeed the driver s vision and make it much harder for the co d.