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

Rear, under bumper diffusers ?
Posted by: roverman
Date: June 02, 2014 06:55PM

I prefer to buy and modify, rather than from scratch. OEM or aftermarket, will do, if it is good aerodynamic design, and can resonably be modded to a Jensen Healey. This is a rear radiator/camback, tailed car. Any ideas ? Thanks, roverman.


Moderator
Curtis Jacobson
Portland Oregon
(4577 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: Rear, under bumper diffusers ?
Posted by: Moderator
Date: June 02, 2014 07:33PM

So you're looking for something sortof like this?
RearDiffuser.jpg

I can never remember... is this for a racecar? An autocross car? A track day car? A street car?


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: Rear, under bumper diffusers ?
Posted by: roverman
Date: June 02, 2014 07:57PM

Mostly street, some track days, even less slalom. Can I get one about 3 feet shorter ? I like "some" of the oem stuff, but maybe the're more for looks than effectiveness ? Not nearly as developed as Ferrari 355,(no wind tunnel available). I do plan to use a manometer/etc. Thanks, roverman.
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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: Rear, under bumper diffusers ?
Posted by: Preform Resources
Date: June 03, 2014 08:31AM

Here ya go Art, it's our generic diffuser for F5/F6 cars.A diffuser as short as you are talking wouldn't do much .
Dave
generic 3.JPG
generic 1.JPG


MGBV8
Carl Floyd
Kingsport, TN
(4512 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Rear, under bumper diffusers ?
Posted by: MGBV8
Date: June 03, 2014 09:30AM

Check out the various styles being bolted under the Lotus Elise.


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: Rear, under bumper diffusers/vortex generators ?
Posted by: roverman
Date: June 03, 2014 01:01PM

I would like to find "vortex generators/applicae", miniturized Wheeler vortex generators, that stick-on, in sheet form. This should make the diffuser more effective, by keeping the negative pressure layer, better attached. Where to buy ? Cheers, roverman.


Preform Resources
Dave Craddock
Redford,Michigan
(359 posts)

Registered:
12/20/2008 05:46PM

Main British Car:
72 MGB V6 3.4

Re: Rear, under bumper diffusers ?
Posted by: Preform Resources
Date: June 03, 2014 11:15PM

Sorry Art , I don't know of anyone using vortex generators on a diffuser, in fact the diffuser pictured on that Mazda is a huge drag inducer because of air becoming unattached and gathering up in the wake at the top rather than exiting cleanly, that car is obviously a solo car, solo cars run huge wings at stall angles and that one in particular has a huge air dam on the rear these things only work when you are trying to develop the most downforce you can for short courses (parking lots) and they usually have enough power to overcome the horrendous drag, In real racing Only Formula one could sport the drag deficit they do because of the power to weight ratio they have.
Dave



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: Rear, under bumper diffusers ?
Posted by: roverman
Date: June 04, 2014 12:52PM

Ok, But does the concept have merit ? Seems like correct ones, will keep air attached longer/more effective ? Three feet "behind" the car, not an option. Considering replacing trunk floor, with possible diffuser, "under"radiator inlet,(rear radiator outlet through camback grille). Cheers, roverman.



Edited 1 time(s). Last edit at 06/04/2014 12:57PM by roverman.


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