Engine air intake locations Options

[Charles Freeborn]

My car has a downdraft fan and lowered roofline that AJRS was building in the 9o's.
When I installed a CHT I realized that it needed more airflow to the cooling fan. Methinks I'll add some scoop(s) to the equation to see if I can get the head temps down.
So, location, location, location. Three images below. Where will the optimum pickup location be? I've seen a webpage done by a professor who used his AX 914 as a model and did some computer and water tank tests, but I can't read the squiggly lines well enough to tell where the best place to locate scoop(s) is. What I've come up with so far:
Store bought scoops - of the kind one sees on hoods. Kinda cute, fiberglasss, would punch 4" holes through the sail panels, move other stuff out of the way and plumb to a plenum that seals to the top of the fan housing.


Build a lexan scoop / plenum (clear so I can see through it with rearview) and catch the airflow at the trailing edge of the roof. Opening would be roughly 2.5" x 12" to match fan opening (11" round fan)


Build a lexan scoop / plenum that catches air at the leading edge of the roof, would probably run through the interior of the car and out through the rear window opening. This seems the most obtrusive to the driver ergonomics, distraction, etc.



I suppose one more option would be to do a sort of hybrid of the two roof top collectors and have it punch down through the roof just in front of the rear hoop. I've seen one (also an AJRS car) done that way. It too had the raked windshield and lowered roofline as mine does.

What say ye? where is the optimal pressure on a 914?

BTW, I've worked with plenty of Lexan, have all the tools, so fab isn't an issue.

Thanks.