I did see a video or photo of a bug in an air tunnel a while ago, but cannot find it now & being at w--k does not help.
I thought I remember seeing the air come right down the back of the car, so air would get into the compartment pretty well.
What I do, and I think Mike still does is have engine lid props, that opens our engine lids about 6 inches or so - at thte bottom.
I dont think air gets driven in that way at all, except here I think the air rushing around the rear of the car pulls a vacuum and pulls air out of the bottom of the engine compartment.
When air is pulled out , air must go in, so this increases the flow of air into the compartment from the top openings by quite a lot.
did this cause converts are missing grills up top
The heat that gets created by the engine in the closed compartment now gets pulled out. Otherwise that heated air would have to go back up through the fan and blow across the engine. - Just kinda following the thinking Bob had about exhuast heat.
My 4 2CENTS 2CENTS
Matt
why not go this way Greg?