Motorhead,
Do you want cooler temps while cruising or sitting?
The vents that Dallas has will definately let some heat out in traffic.
I'm no aerodynamacist, but I play one on the net
We know that with speed, the car wants to lift due to low pressure over the car. When air is in motion (us, really), the air pressure is less, with a couple of hot spots of pressure, like the front and windshield. Add to that the big gaping mouth and it would
seem to
me that pressure would build in the engine compartment (maybe not enough to lift a heavy glass hood), hence Morris' hood vents and the idea of the turkey pan (separating engine compartment pressure with the outside, trying to 'force' air in with the scoop at speeds). Don't we know that the hood scoop with no turkey pan isn't really helping?
We have Magnahelic gauges at work. I'll try and find one with +/- and have my wife hold it, with the tube sitting in the engine room.