Grizam303, thanks for the insight. Yes, there may be a pressure drop at speed. The only way to really find out is to test it with and without the cold air inlet attached. I am going on my own intuition and knowledge gleaned from car manufacturers. I wish I could be more scientific, but I have zero instrumentation to measure vacuum, pressure and air velocity.
I wish I could design a flapper valve that would do just what you mentioned. I can fabricate things to a certain extent, but designing valves that open and close is not one of them.
I am also searching [in vane], for some type of grille/inlet/face plate that is about 3 inches tall and maybe 4-6 inches long with downwards angled louvers. I would like to make a cut in the wiper cowl on the driver's side as this is really the most ideal place to pull air in from.
So far, I have come up snake-eyes. If you or anyone else could find something like that for me, I would greatly appreciate it.
