This is the way I would do it. Louvers in the cowl of course.
Not shown yet. Make a good air racer.
-- Paul Lamar ...No rotor no motor.

With a little bump to clear the corner of the cooler!
Paul a shallow ramp exit and reverse scoop you could do much better
aerodynamically than the louvers. This was used on quite a few of the
Reno racers. A ramp like raised surface open only at the rear.
Bill Jepson

I don't think so. I did not see anything like that on the winners.
Got any pictures? Did you read this?:
http://www.rotaryeng.net/how-to-cool12.html

Also read:
Aerodynamics of Propulsion. D. Kuchemann & J. Weber McGraw-Hill Book Company
Inc. 1953 Lib. Of Cong. Card # 52-6541 The bible of the aerodynamic design
of scoops and ducts. Chapter 12. Particularly pages 277 to 285.

If you have it or you can find it.

Anything solid within shouting distance of the back of the rad is
going to restrict the flow through the rad.

Never the less send me a scale Solid Works 3D of what you have in
mind. Don't forget the end of the oil cooler is three or four
inches in front of the firewall.

Paul Lamar ...No rotor no motor.

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