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FWIW, from a not very scientific observation of the dams on multiple makes
of cars, -- cars of European and Asian origin are most likely to have them --
the industry convention, if not standard, seems to be:
* The front air dams are ~2.5 in. high, and ~1.5 x tire width with the outboard
end of the dam roughly at the tire centerline. (This suggests to me that airflow
just in front of the front tire is angled outward and not parallel to the
centerline.)
* The rear tire dams are about 2 in. high, and the outboard end is only slightly
offset inward from the outer edge of the tire.
* When installed at the front edge of the wheel well, air dams are installed
perpendicular to the centerline, and perpendicular to the road surface, that
is, they point straight down.
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