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Originally Posted by cody
How is a piece of material on the hood going to increase debris reaching the car? :confused: The vortex generator/hood protector would point more air into the hood scoop and protect the hood from damage. A piece of debris that reached the hood wouldn't be any more dangerous or common. It's not going to suck junk off the road and throw it at the car.
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I'm not a aerodynamicist so I'll defer to JC on the details, but the way a bug deflector works is by spoiling air at the leading edge of the hood so bugs are deflected by the airflow up and away from the hood/windshield.
If you're attempting to use the same principle to direct more air at the hoodscoop, you're going to also be directing anything in that air at the scoop, and therefore the windshield behind it. I.e. bugs and the like that would normally by pushed aside by the shape of the hood are now being directed at the car.
Not only would such a "vortex generator" probably work worse than a properly designed hood scoop, it would probably concentrate bugs into the scoop, and on the windshield, not to mention the possible effects during wet conditions... personally I'd rather have as close to laminar flow over my windshield, rather than a swirling mess of rain/snow.
...but again, I've got no background in aerodynamics aside from a general understanding, so I'll differ to the people that know more about these things like JC and AtomicLabMonkey.