[DeTomaso] New engine

[MikeLDrew at aol.com]

In a message dated 12/5/14 9 21 56, jjdetrich at gmail.com writes:


> 
> A technical nitpick?
> 
> I would expect that the smaller elephant ears that don't stick out very 
> far would work slightly better than an unducted set-up. Reason: the regular 
> engine vacuum draws in the air it needs regardless of the source and cold 
> air from the elephant ears is always better than the warmer air in the engine 
> compartment. Plus the disruption of the surface flow caused by the vacuum 
> would probably add some ram effect but not nearly as much as the bigger 
> elephant ear ducts. Has anyone actually done any testing of this?
> 
> 
>>>You would think so, but apparently this isn't true.   I just got done 
reading a spectacular book on the Cobra Daytona Coupes written by well-known 
Pantera dealer George Stauffer, and Daytona designer Pete Brock.   He created 
scoops very similar in size and shape to the ones we are speaking of, 
intending them to cool the rear brakes.   They were astonished to discover that 
the air actually flowed backwards through them, and the drivers were getting 
bombarded with heat from the rear brakes blowing on their backs!   This was 
confirmed with tuft tests.

The Swedes did some Pantera tuft-testing of their own and while they didn't 
specifically look at these scoops, the tufts did determine that there is a 
fairly pronounced layer of 'dead' air along the windows.

Pete Brock figured out how to make the scoops work on the coupe; they 
created curved plexiglass 'fences' which were mounted to the A-pillars and stuck 
out a few inches.   They took the high-pressure air that was blowing off the 
sides of the windscreen and creating the vacuum along the sides, and 
redirected it so that it blew straight back, into the scoops behind the windows.

While something like that would likely work for the Pantera too, it would 
look decidedly weird.   The more effective solution is to simply reach 
further out from the side of the car using bigger scoops, through the layer of 
'dead' air and into the high-pressure airstream.

Mike  
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   In a message dated 12/5/14 9 21 56, jjdetrich at gmail.com writes:

     A technical nitpick?
     I would expect that the smaller elephant ears that don't stick out
     very far would work slightly better than an unducted set-up. Reason:
     the regular engine vacuum draws in the air it needs regardless of
     the source and cold air from the elephant ears is always better than
     the warmer air in the engine compartment. Plus the disruption of the
     surface flow caused by the vacuum would probably add some ram effect
     but not nearly as much as the bigger elephant ear ducts. Has anyone
     actually done any testing of this?

   >>>You would think so, but apparently this isn't true.  I just got done
   reading a spectacular book on the Cobra Daytona Coupes written by
   well-known Pantera dealer George Stauffer, and Daytona designer Pete
   Brock.  He created scoops very similar in size and shape to the ones we
   are speaking of, intending them to cool the rear brakes.  They were
   astonished to discover that the air actually flowed backwards through
   them, and the drivers were getting bombarded with heat from the rear
   brakes blowing on their backs!  This was confirmed with tuft tests.
   The Swedes did some Pantera tuft-testing of their own and while they
   didn't specifically look at these scoops, the tufts did determine that
   there is a fairly pronounced layer of 'dead' air along the windows.
   Pete Brock figured out how to make the scoops work on the coupe; they
   created curved plexiglass 'fences' which were mounted to the A-pillars
   and stuck out a few inches.  They took the high-pressure air that was
   blowing off the sides of the windscreen and creating the vacuum along
   the sides, and redirected it so that it blew straight back, into the
   scoops behind the windows.
   While something like that would likely work for the Pantera too, it
   would look decidedly weird.  The more effective solution is to simply
   reach further out from the side of the car using bigger scoops, through
   the layer of 'dead' air and into the high-pressure airstream.
   Mike