Craig,
>From an aerodynamic point of view, the high velocity air rushing by the top
bottom and side of the car is what creates the low pressure area, the same
principle that enables airplanes to fly. I've heard other people say that
cutting holes in the wheel wells allows hot engine air to escape, but air
already has to be escaping as fast as it is coming in through the radiator /
front of the car anyway. However, with that air forced into the engine
compartment from the front, cutting holes in the wheel wells should create a
positive flow from the engine compartment into the wheel wells from the
principle of the air rushing by on the outside as well as the air forcing itself
in through the radiator. I think there is more area for air to escape out the
bottom of the engine compartment than you will create by cutting holes in the
wheel wells, so the air flow should be relatively small, with relatively little
pressure difference. I don't believe the foot area would vent outward into
the wheel well, since the cockpit is open to the air rushing by on the sides and
the top already.
I think the real key for removing heat from the engine compartment with the
wheel well headers is that the hot exhaust pipes are now out of the engine
compartment giving off heat to the environment outside of the engine
compartment.
Cheers,
Rick
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