Quote:
Originally Posted by Cd
Thanks for the reply Phil.
I decided to not waste my time on the test, even though it would have been really easy to perform.
I do have a question for you though : When you say that you had the hatch on your CRX partially open and got a steady flow of exaust, you did have the front windows open too ...right ? 
( of course ) |
Cd,I tried everything I could think of to prevent the incursion of exhaust.Windows-down for dilution was no good.
Windows up,ventilation at 100% outside-air and fan on high no good either.
Nothing seemed to prevent the exhaust from entering.
It's like a VW Beetle/Ghia/Porsche 914/912/911. The air rotates around the back and imparts a ram pressure ( really good for air-cooled engine ).With the body "breached" that pressure is communicated forward towards the ventilation outlets or any region of lower pressure ( especially the A-pillars ).
In the FLOW-IMAGES there is a photo of the trunklid of a 1950s Ford Fairlane with lampblack and kerosene showing the peculiar flow pattern behind the roof.
I believe this dynamic is also present behind the car although there is typically no structure there.