Quote:
Originally Posted by bobdbilder
Yes agreed. Where it is hot, I seldom open the fresh air vents for the AC. There is a workaround if one still have this need. You can see where the fresh air intake is, remove the seal except those that are right adjacent to the intake hole. The recommendation is for cases where a car is found to be overheating. As Iamnotahippee mentioned, it is a known quick fix.
I was hoping that the discussion has opened up the idea that hot air at the base of the winshield might modify airflow over it. There might be a remote chance of reducing Cd. This might be useful for Pickups and old Saabs where the angle of the windshield is more upright than your normal sedan. If this is proven, then that energy waste wouldnt be such a waste after all.
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Actually,Professor Kamm got a patent for doing this.
The air from the engine bay was ducted to the base of the windshield,where it helped re-energize the flow heading up the windscreen and delay separation downstream.You can see what may be this extractor vent on Kamm's personal car (lowest drag of all K-Cars)
Today,the convention is to create a small burble at the cowl which is isolated from the outer flow,leaving the rest of the air to blast past this region,with just a tiny drag penalty.
Professor Morelli dedicated much wind tunnel time at Pinifarina to create tuned extractor ducts from the CNR research car's engine bay.
