Quote:
Originally Posted by Mandilon
I read that grille blocks are ineffective. EPA blocked an 18 wheeler's grille oppening and there wasn't any effect in wind resistance. I have the PDF file somewhere hope I find it.
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i read somewhere that elvis was still alive, doesn't make it true
but to be more serious....
on an 18 wheeler, i can see how a grill block would be a bad thing. an 18 wheeler grill is very wide, tall, and vertical. with an "open" grill, air will pass through it and while most of it just bounces around and creates turbulence, some of it has a fighting chance to make it out the bottom of the rig.
with a grill block, air just hits a massive wall at a 90 degrees to the road.
compare trying to run down the road holding a 4'x8' sheet of plywood straight up to doing the same with a 4'x8' window screen.
on a car/pickup/suv, the grill block diverts the air over/under the car at a more aerodynamically pleasing angle. think teardrop shape.