[DeTomaso] New engine

Tomas Gunnarsson guson at home.se
Sun Dec 7 07:24:57 EST 2014


The whole discussion whether air flows in or out of the glass-less quarter window opening is moot if you duct from the scoop to an enclosed air box. The engine will suck ambient temperature air at any speed with that setup.

Tomas

----- Original Message ----- 
From: "Mike Drew via DeTomaso" <detomaso at poca.com>
To: <jjdetrich at gmail.com>
Cc: <npdrs at maui.net>; <detomaso at poca.com>
Sent: Sunday, December 07, 2014 5:54 AM
Subject: Re: [DeTomaso] New engine


> 
> 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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