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 Dual mode rally tractor exhaust!

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T-Dub13
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TheRainbowBoxer
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PostSubject: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 4th 2014, 1:36 pm

Stretch and I built a custom exhaust setup for my rally tractor, Chaos...

The dual exhaust is brought into one pipe using a custom header/collector.
The cutout is built from the butterfly out of a carburetor.  
The straight pipe goes right out the back, and the silent pipe goes through a muffler before rejoining the tailpipe.

Pretty much a totally useless modification (unless you are dealing with noise ordinances), but way fun to come up with an idea like this and see it to completion.



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Moose
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 4th 2014, 2:13 pm

I friggin love it Very Happy almost enough to build my own then come over and have you guys rebuild it right! lol Cant wait to hear what it sounds like in a few weeks
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 4th 2014, 2:48 pm

i like it! i love the outro haha
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 4th 2014, 2:50 pm

Shoot i love it i live right in the middle of town so that be great for me. Awsome just great.
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 4th 2014, 3:56 pm

Very cool. Only thing I'd be wondering about is trying to balance the A/F mixture so it's okay in both settings. Fair bit of restriction in the "quiet" part of the system, starting with that 90° tee fitting. Awesome idea tho!
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Stretch44875
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 4th 2014, 6:42 pm

Ah, it's a rally mower, not a race car! Completely stock carb.


I'd call the dash lever a mute lever. When you close the exhaust, it's darn quiet at the rear. Reving the engine doesn't make any difference, it's still quiet...

And OMG, did I have to do some thin steel welding... That exhaust is freaking like a rock.
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 4th 2014, 7:49 pm

Yeah- I watched the vid. Quite a difference! I'd say, mission accomplished!
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 4th 2014, 10:11 pm

LOL Moose! You'll have to chalk up quite a few garage/tool cleanups to earn that kind of assistance!

The only reason Stretch indulges some of my weirder ideas is because I make a pretty good shop slave.


Proud member of the Mower Cycle Gang... aka the "Mowrons!"

My build (Chaos is one of 3 built like this)
Chaos Build

The Mower Cycle Gang visited 1puglife in May 2014
Check out the pics and vids!

Haspin 2021 was a blast!  Check out pics and vids here
Haspin 2021 thread

Join us for the annual Mowron-fest at Haspin Acres!
Haspin Acres Rally 2022!

Check out my YouTube for more tractor action, my vlog, and my bus build!
TheRainbowBoxer on YouTube
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Moose
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 4th 2014, 10:52 pm

TheRainbowBoxer wrote:
LOL Moose!  You'll have to chalk up quite a few garage/tool cleanups to earn that kind of assistance!

The only reason Stretch indulges some of my weirder ideas is because I make a pretty good shop slave.

Heh if I lived closer Id be over every weekend! need to learn to weld better >.>
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 5th 2014, 12:52 pm

Nice work! Sounds great too!  Wink 
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 6th 2014, 12:22 pm

Since everyone like pictures, I have some to post...

Dual mode rally tractor exhaust! 0503141709b_zpsds5k4ytg

Dual mode rally tractor exhaust! 0503141709a_zpsd17ke9wo

Dual mode rally tractor exhaust! 0503141709_zps1qhstmt9

Dual mode rally tractor exhaust! 0503141708c_zpsqtb41tvw

Dual mode rally tractor exhaust! 0503141708b_zpsxtvuarhb

Dual mode rally tractor exhaust! 0503141708a_zpswfyebcdc

Dual mode rally tractor exhaust! 0503141708_zps0sgxgaja
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Stretch44875
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 6th 2014, 12:25 pm

Wow, there are some ugly welds... thats what happens when you weld thin galvinzed pipe, and fill gaps! No leaks, so did something right.

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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 6th 2014, 12:31 pm

Those welds aren't as bad as some I've seen! I still don't know why most guys on this forum swear by flux core wire and then don't clean their welds afterwards.  Shocked Razz Laughing 

Be careful not to breathe the fumes when welding galvanized pipe. Bad stuff.  Wink 
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 6th 2014, 2:46 pm

This is something I've wanted to do with my street bikes. Nice work.
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 6th 2014, 3:35 pm

Stretch44875 wrote:
That exhaust is freaking like a rock.

Excellent work! I like it. I wonder how long that butterfly valve will last in there?

And I have another question...

Just exactly how -does- a rock, 'freak'???  Wink Laughing 
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeMay 7th 2014, 9:31 am

On the welds, I've gotten pretty good at sticking thin steel together, just not in a pretty way. .035 wire, on the lowest setting of a miller 220. I do have a cheap 110v mig welder I could try for the thin stuff, but the big one runs very nice.


Angchor wrote:
Stretch44875 wrote:
That exhaust is freaking like a rock.

And I have another question...

Just exactly how -does- a rock, 'freak'???  Wink Laughing 

Very slowly.........


Not sure on the butteryfly. But it is downstream some. Most times it will be open. Very smooth action at the moment, see how it does.
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeOctober 9th 2014, 11:56 pm

Well now not to beat a dead horse or anything... I am wondering what exhaust is better, dual straights or a 2 into 1 header, or dual straights with a crossover pipe?
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeOctober 10th 2014, 8:47 am

ZSmachines wrote:
Well now not to beat a dead horse or anything... I am wondering what exhaust is better, dual straights or a 2 into 1 header, or dual straights with a crossover pipe?

For performance on a V-twin (taking notes from the Harleys I've built) I've seen the best dyno numbers from a 2-into-1 exhaust. The length of each header should be in tune with the cam (more on that in a minute*), and the collector diameter equal to about 1.5x the single header diameter or slightly larger.

*If the cam being used has a long duration and (most importantly) a lot of overlap, then the tuned header length becomes critical. The stock B&S cams don't have enough of either to make the header length come into play.

So, just build the exhaust to fit the chassis and have fun with the tractor. I've noted that the 2-into-1 exhausts typically sound best as well, especially with a glass pack muffler. Cool
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeOctober 10th 2014, 10:44 am

Oh, ok, thanks! i am talking about my oppy, so i dont know if it would apply to the same principles as a v twin, but i am in dire need to redo my exhaust. i think that i will go with at least a 2 inch pipe. will that be big enough?
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeOctober 10th 2014, 11:04 am

Yeah, same principal for the oppy I'm pretty sure.  Think of it as 1/2 of an old school VW Bug motor and look at their exhausts...  The high performance ones run 4-into-2-into-1.  Same for Subaru boxers.

What size are the EXH ports?  I'm assuming about an inch...  So go with the matching ID header pipes and into a 1 3/4" collector.  

The nice part about that is if you have a 1 3/4"" collector, you can just clamp on a Cherry Bomb!

A great trick I've used is bicycle frames and forks for building headers.  The BMX forks are thin walled tubing about the right size and have a curve built in!  I have a thread in here somewhere showing that I think...

Edit: Found it. Lookey here! https://www.atltf.com/t3367-t-dub-s-exhaust-system-projectLINK
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PostSubject: Re: Dual mode rally tractor exhaust!   Dual mode rally tractor exhaust! Icon_minitimeDecember 11th 2014, 8:45 pm

Hows this holding up? I was thinking about a 2 into 1 setup on mine with a cutout. Is the butterfly brass or steel with some junk coated on it? No leaks or anything?
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