Bodywork, Paint, Interior, Trim, & Wiring

discussions about bodywork, paint, interiors, trim, audio, electrical components, wiring, etc.

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roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Where to take in air ?
Posted by: roverman
Date: November 10, 2011 07:39PM

Reportedly up to 2/3 of the total air drag of a passenger car is from front of vehicle to "base" of winshield. I suspect taking in massive amounts of air in a front grille helps contribute to this overall drag considerably. Case in point, the 914 Porsche has a CD of .39 ? This not because it has beautifull, flowing, smart aero lines, but partly perhaps of no front air inlet. Because of this, I shall test a closed off front, on the Hemi Healey. The TR6 like, flat area on the rear, creates a suitable low pressure area to dump cooling air from rear wheel wells and radiator. To be continued, roverman.



Edited 1 time(s). Last edit at 11/19/2011 11:32PM by roverman.


socorob
Robbie
La
(173 posts)

Registered:
09/17/2009 04:42PM

Main British Car:
1963 Sunbeam Alpine Series 2 Ford 2.8 V6

Re: Where to take in air ?
Posted by: socorob
Date: November 13, 2011 10:59PM

[www.autospeed.com]

Do some reading around on this site, lots of good aero info there


MGBV8
Carl Floyd
Kingsport, TN
(4512 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Where to take in air ?
Posted by: MGBV8
Date: November 16, 2011 08:43PM

Art,

I see it as more to do with the frontal square footage. Where did you get that low CD number?

--------------------------

914 CD's

1)top on,windows up,&headlights shut CD .363
2)Headlights up CD.380
3)headlights up, windows open CD .381
4)same as above but roof off CD.484
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Preform Resources
Dave Craddock
Redford,Michigan
(359 posts)

Registered:
12/20/2008 05:46PM

Main British Car:
72 MGB V6 3.4

Re: Where to take in air ?
Posted by: Preform Resources
Date: November 17, 2011 10:07AM

Years ago a couple rally guys put a Volvo six from a boat in some small car and put the rad in the deck as you are suggesting Art, they took air in on the rear qtrs thru Naca ducts and it worked, Naca ducts don't create drag, however for them to work
they need to be located where attached air is available. Here is a Carbir sports 2 car that we developed a naca duct intake
30 sq. in. opening, ducted back to the rad (in front of the rear wheel) and built a dedicated duct for the air to flow to the rad.
then dumps out the back of the body .
Dave Craddock
GEDC0207 small.jpg
P1010004.JPG


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Where to take in air ?, other than "nose"
Posted by: roverman
Date: November 30, 2011 08:36PM

Carl, my brain did a "typo". OK, I bought a "Magenehelic" pressure differential gage,ebay,+/- 1 hg. This should prove easier use for 1 person, than yarn and a camera, etc. Naca ducts "look cool" and don't ad additional drag, BUT become less effective with speed as their laminar flow, boundary layer increases with speed. Now "if" they had a crafty shape on the floor, like Wheeler Vortex Generators or such, who knows ? I'm thinking if I couldmake something under the car, similar to Ferrari F355, then WOW ! To be continued, roverman.



Edited 1 time(s). Last edit at 12/03/2011 06:10PM by roverman.


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