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 Post subject: Side exhaust
PostPosted: Thu Oct 24, 2019 3:48 pm 
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Joined: Mon Feb 29, 2016 9:12 am
Posts: 111
Location: Boston, Ma
Is a Shelby Cobra type (tubing, muffler, heat shield, and turn-out outside the rocker panel) exhaust system allowed in Production?
I can't find where it is restricted or not allowed, but don't see any in use.

If they are allowed, what are people's thoughts about them?

Thank you,

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 Post subject: Re: Side exhaust
PostPosted: Thu Oct 24, 2019 4:32 pm 
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Joined: Wed Apr 27, 2016 8:10 pm
Posts: 71
I would say yes. The issue would be not allowed to modify internl or external body panels to get it out. On a Spridget with a flat sided body, getting out the wheel well makes a very severe 90 degree angle. As seen on Todd Wheeler's HP and FP cars. A Spitfire is easy with a large wheel opening and a curved rocker. What kind of car are you thinking of ?


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 Post subject: Re: Side exhaust
PostPosted: Thu Oct 24, 2019 5:41 pm 
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Joined: Mon Feb 29, 2016 9:12 am
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Location: Boston, Ma
GT6! (It’s in my handle :D)

For this discussion it’s the same as the Spitfire, but with more pipes to route.

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 Post subject: Re: Side exhaust
PostPosted: Thu Oct 24, 2019 6:10 pm 
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Joined: Fri Oct 01, 2010 9:21 am
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Exhaust System
1. The exhaust header and exhaust system is unrestricted. Floor pans can be altered only to
recess mufflers. No modifications can be made to the bodywork to fit any other part of the
exhaust system.


So, you can run the exhaust anywhere you want, as long as you don't modify the body work in any way (rocker panels, etc).

Seems like yes, if you're careful and it all hangs down and you don't modify the body.

Probably best (if you want to do this) just in front of the tire for clearance reasons.

Also smart to make it actually exit outside the body so you're not sitting in a cloud of C02 on the grid.


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 Post subject: Re: Side exhaust
PostPosted: Fri Oct 25, 2019 3:39 am 
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Joined: Wed Jul 06, 2011 3:48 am
Posts: 658
Location: Florida
We run our Sprites with through the tunnel exhausts. The pipes are 1/4 inch larger diameter than our ground clearance so don't have much choice. Can you do that with the GT6? My only experience is with the Spitfire so not much help there.

Bob

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 Post subject: Re: Side exhaust
PostPosted: Fri Oct 25, 2019 7:56 am 
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Joined: Mon Feb 29, 2016 9:12 am
Posts: 111
Location: Boston, Ma
For this discussion, the GT6 and Spitfire are the same thing. The GT6 just has two more cylinders and a hard top.

I can certainly run the exhaust in the stock location down the tunnel but am interested in exploring options for the following reasons.

*Avoiding the tight gap between the frame rail and the engine.
*Removing heat from the tranny.
*Removing heat from the drive shaft, my leg, and my butt.
*Removing heat from the differential.
*Light weight exhaust system.
*Getting the exhaust gasses outside the car.


There must be a good reason why I'm not seeing any of this style system in competition.
Maybe it's too vulnerable?
Maybe it's too much aerodynamic drag?

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 Post subject: Re: Side exhaust
PostPosted: Fri Oct 25, 2019 8:18 am 
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Joined: Sat Dec 12, 2009 8:08 am
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Location: Atlanta, Ga
Seems like I remember Todd Wheeler running his exhaust out the front tire well and running the pipe down the side ending just at the rear tire well. I had a side exhaust on my Turner 950 S that ended in the same location (reason I am now mostly deaf on my left ear). But, the Turner had a wide opening for the exhaust to exit and sat high because of the tube frame under it. And I believe Billy Coates built a side pipe for Kenny P.

As long as you can get it out the wheel well without modifying the body, I don't believe anything prohibits it from being on the side of the car. Get some scrap pipe ( or PVC) and have a go at it to see if doable.

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 Post subject: Re: Side exhaust
PostPosted: Fri Oct 25, 2019 9:34 am 
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Location: Wauwatosa, WI
Remembering back to Dave Lemon's MazdaTrix RX7, the 90* bends I couldn't believe at the rear of the vehicle (more than 1 90* bend), Yes, the tubes were much larger. Check the car today or ask Dave.

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 Post subject: Re: Side exhaust
PostPosted: Fri Oct 25, 2019 1:05 pm 
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Joined: Mon Aug 19, 2002 10:44 am
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Location: Hermosa Beach
FP Racer wrote:
Seems like I remember Todd Wheeler running his exhaust out the front tire well and running the pipe down the side ending just at the rear tire well.

As long as you can get it out the wheel well without modifying the body, I don't believe anything prohibits it from being on the side of the car. Get some scrap pipe ( or PVC) and have a go at it to see if doable.
Not the best shots, but you can see that it has been done. Steve Hussey's Lotus 7, as well as most of the other Loti, have an exhaust on the exterior. I'm probably not the only one on this site with a few burns to prove their existence.


Attachments:
1979 Runoffs HP H Todd Wheeler adjusted.jpg
1979 Runoffs HP H Todd Wheeler adjusted.jpg [ 209.06 KiB | Viewed 3135 times ]
H Todd Wheeler FP Sears Point.jpg
H Todd Wheeler FP Sears Point.jpg [ 155.53 KiB | Viewed 3139 times ]
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 Post subject: Re: Side exhaust
PostPosted: Mon Oct 28, 2019 4:01 am 
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Joined: Sun Dec 06, 2015 5:33 am
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Location: Titusville, Fl.
I ran one on my '73 Midget H car. Made by Don Loftis from a mini Maniflow LCB. Worked well but had to wear an ear plug in left ear or be deaf for an hour.
He has run them for years on Bugeyes in SCCA & Vintage.
He stays close to the rule book & doesn't modify any body parts.

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