Quote:
Originally Posted by eagle
the fiesta in nearly all rallycross/wrc/s2000 versions uses the same spot for the hood heat extractors along with some metal (?) around the inside half Im guessing in order to create vortices for even more heat extraction (??) 
anyway, since EVERYONE in the motorsport industry uses the same spot I am pretty sure its measured and proven correct, however water ingestion in a daily driver would be a pitta since in both places there are sensitive parts like ecu loom , battery etc so a proper water trap must be used somehow  |
As Vman455 suggested, for a road car, taking lessons straight from motorsport is fraught with danger. Looking at those pics, I'd suggest they expect lots of yaw (ie airflow not coming directly from the front) - which may well be the case in rallying!
With this sideways airflow, the little deflectors would decrease the pressure downstream, so aiding flow out of the holes. I can't see you driving much like that on the road...
I'd probably go with this if you like the idea of the side vents:
