<VV> VV Muffler project for a cheapskate

[Frank DuVal]

Airflow is not always a logical straightforward line of flow. This is 
why wind tunnels are used to study the way an object affects airflow. 
The back of Corvairs used to be black in the days before Viton o-rings 
as most of them leaked oil. The oil was sucked back onto the rear panel. 
Same with station wagons, they suck exhaust in the rear window 
(backlight), or even non-Corvair sedans if the trunk is not closed. An 
early has vents in the engine lid very close to the break point of the 
lid to rear panel line. So it IS possible to suck exhaust in under the 
right air flow conditions.  Since the turbo models have the exhaust in 
the rear, even on earlies, I would not be concerned if John's exhaust 
was similar.

Remember how planes fly. The path over the wing is not the same as under 
the wing, therefore lift due to pressure differential. Car bodies have 
similar airflow disruptions and can have pressure differentials. Wind 
tunnel testing could be the answer. Anyone have access to a car sized one?

Just goes to show one must not operate a Corvair with the rear lights 
missing! :-)

Frank DuVal

AeroNed at aol.com wrote:

> 
>In a message dated 1/7/2007 11:55:35 A.M. Central Standard Time,  
>hmlinc at sbcglobal.net writes:
>
>Further,  
>that straight out the back exhaust (at least a portion) can be sucked  
>forward and into the engine compartment - and hence into the heater  system.
>
>
>Huh!?!
> 
>How does the exhaust get sucked forward? If the car is moving forward there  
>will be sufficient airflow over the deck lid to prevent any exhaust from 
>flowing  forward. If the car is still, the chance of exhaust flowing forward is the 
>same  if the exit is in the rear or the side. Now if the car is going 
>backward, now  you might be able to get some exhaust into the inlet.
> 
>Ned
>
>  
>