Quote:
Originally Posted by aerohead
In a four-season climate,snow might enter,as well as rain.They may have internal guttering to carry precip away,it's hard to tell from the photo.
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It has some kind of mesh on top and below that there are air guides, bit like half open blinds (note, photographer has not understood vent being outlet as he claims it being intake):
2006 Mitsubishi Lancer Evolution IX hood | Flickr - Photo Sharing!
Bulge at front of vent is to increase low pressure area at hood vent from my understanding, which might help extract air bit better out.
Self made versions that mimic shaping of EVO hood scoop have been shown to be very effective in throwing snow upwards at speeds of 25mph and above, so it is not very problematic in terms of snow.
Those 'blinds' are probably important part when there is no tunnel, one can also do working vent by simply doing few cuts and pushing leading edge down, to make this kind of shape, but it is important that rear of each fin is not rising above hood level:
If there is small bulge added to leading edge side of vent (that is front) it will work more efficiently.
From my memory, rule was that half way of hood is where one should no longer add exhaust vents, from there to windshield it should be intake area, but of course exceptions may apply.
That is something I wish to experiment, just IC ducting comes on way that runs in hood.