Miata Mailing List: September 1993, Message #85
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   From: sgrossma@lemans.stortek.com (Steve Grossman)
Subject: Re: Windshield Air Pressure
   Date: Mon, 13 Sep 1993 08:26:47 -0400


> Subject: Windshield Air Pressure
> Date: 	Mon, 13 Sep 1993 07:38:55 -0400
> Content-Length: 709
> 
> I think that I mentioned previously that back in the 70s, GM introduced
> an air intake system designed to take asvantage of the increased pressure
> at the base of the windshield.  GM called it "Cowl Induction."
> 
> I would assume that the difference between the windshield angles between
> the Miata and those GM products might be slightly different, but would
> also expect that there is still a pressure increase (above ambient) at
> that location on the Miata.  I know better than to make assumptions

Isn't this where the fresh air intake for the interior vents is?  I believe that
when the climate controls are set to use outside air, not recirculated air, then
the air is drawn in from here.  Since one can get quite a good breeze through the
vents when driving without running the fan, I'd assume that the pressure is above 
abmient.  I'd be interested in the results of any conclusive tests.

Steve