[DeTomaso] Movement of air

Charles Engles cengles at cox.net
Sat Nov 25 22:14:15 EST 2017


Dear Dan,


                  Thanks for the excellent report.


                               Warmest regards,  Chuck Engles




-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On Behalf Of Daniel C Jones
Sent: Saturday, November 25, 2017 7:55 PM
Cc: detomaso at server.detomasolist.com
Subject: Re: [DeTomaso] Movement of air

> Did the NASCAR guys not know about the Pantera side boundary air layer 
> or
did they know that their design would work and ignored the boundary layer?

It's not clear if the NASCAR guys were involved in picking the location of the inlet duct or it chosen by the monkeys.  If the NASCAR guys had chosen the duct, I would have thought they would have used a NACA inlet.  In any case, the boundary layer effect is of no consequence since a plain duct, instead of a scoop, was chosen.  In a plain duct, all that matters is the pressure differential.  Since the system is sealed, the engine provides a low pressure side so air flows in.

> I am even more interested in that sequential 6 speed transmission from
Australia. Does anyone have info on that unit?

I did a quick search and came across someone who mentioned it cost him $30K USD to get one to the United States for his project.

> The rear deck lid wing is one of the best looking wings on Panteras.  
> At
least they got that part right.

It's really more a decklid spoiler and I wonder what sort of airflow it actually sees.  The flow detaches at the aft edge of the roof.  The question is does it re-attach before the decklid spoiler or is the only meaningful flow coming in from around the sides of the car?  In the first part of the build, they made mention of putting the Pantera in a wind tunnel but, if they did, it was not shown in the second part.  Oddly, the Cobra Daytona replica had a very large and tall rear wing even though the flow on that vehicle stays attached, thanks to the truncated tear drop body shape (a.k.a. Kamm back).  A wing is more efficient than a lip spoiler and they had extra front end down force (from the tri-plane front spoiler) so perhaps they needed the rear wing to balance it out.  Still, the rear wing size seems excessive.

> It all looked very staged and scripted to me right down to the racing

Ditto.  It was obviously a Ford Racing/NASCAR publicity stunt.

> Sure would be nice if the parts were listed somewhere!

Since Ford Racing supplied both engines (and probably more), I would have thought they would have gotten into more detail on them.

> With EFI I guess any ram air effect isn't a big deal as the MAF/MAP
sensor will adjust for the right Air/Fuel ratio, but I assume the ECU mapping would have to compensate for overall fuel charge?

The Pantera had no ram air effect to deal with but, in general, yes.

> The car was done by some group - maybe for TV - or auction - or 
> something
- that had a scoop going over the cockpit and into the engine bay. I think it had a high performance V-6

That was built for the same "Fast and Loud" TV show when Aaron Kaufmann was still working there.  It was a modified Ford 3.5L Ecoboost V6.


https://www.drivingline.com/articles/an-ecoboosted-pantera-you-ll-go-bananas-for/

> BUT - my point (or question) is: does air go IN or OUT of the screen
behind the cockpit.

If that scoop had been properly designed, it would have had a sealed path to the engine so the flow in the engine compartment is irrelevant.
However, the scoop was way too low with the inlet opening area directly in the dead zone of the boundary layer.

Dan Jones



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