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Old 03-08-2013, 03:31 PM   #7 (permalink)
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Originally Posted by ChazInMT View Post
It has been discussed many times in the forums that smooth is only a slight benefit on the front of the car. A recessed block will give you 95% of the benefit of a smooth one. Obsess away if you wish.

It has to do with the air stacking up and sort of forming its own shape. By diverting the air around or over your car, you are sending it on a less resistive path than going through your radiator and engine bay.
Yes, and since the air just in front of the grill is moving at almost the same speed as that grill, the friction is negligible.
The higher pressure ahead is pushing the surrounding air aside and over the car, and does so almost completely frictionless.

On the other hand, recesses that are placed in the air stream like at the very edge of the bumper or the headlight area, they do have an impact and would gain from flushing.
2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
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