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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 01-15-2009, 03:42 PM   #1 (permalink)
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Straight Pipes

I have read a ton of exhaust threads but didnt really find what I was looking for...
I would like to build myself a set of straight through drag pipes, that hook up to the headers where the regular silencers do.
Obviously I would need to rejet, but would there be any detrimental effect to my tuning? Like not enough back pressure?
I want some long pipes, like real loooong. That stick out past my back tire.
What size of tubing would I need?
S.
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Old 01-15-2009, 04:41 PM   #2 (permalink)
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take your bike to a muffler shop, they should be able to bend/fab/adapt something to your bike.
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Old 01-15-2009, 06:32 PM   #3 (permalink)
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Yup,thats the ticket. Per JimBonnie`s calculations,68" long pipes are near optimal [68" total,header and pipe,each side.]
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Old 01-15-2009, 11:53 PM   #4 (permalink)
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Stock headers on these bikes are 1 1/2", so a muffler shop should have that size on hand. I'd stick with that. If you're going to run them pretty long, a simple rejet should give you good performance. By using extended pipes of the same size as the headers, you should pick up some marginal backpressure from the snorkel effect.

Please let us know how this turns out. I for one have considered doing the same thing just to have some straights on hand to swap onto the bike when I feel like raising a little hell. It should sound awesome, and with the longer pipes, most of the noise will be behind you as you're tooling down the road.

If you cut the pipes off square, the exhaust projects back and produces more of a booming sound, while doing a slash cut produces a sharper tone, bouncing the sound off the road. If you turn the slash cut out rather than down, the sound projects out, making it louder from the rider's perspective. Slash cuts that face out are a blast in tunnels or under an overpass, but otherwise tend to sound pingy and be annoying on longer rides.
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Old 01-16-2009, 05:41 AM   #5 (permalink)
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I did a search for JimBonnies calculations but couldnt find anything...
The exhaust shop is a good idea. Id like to keep them as slip ons as opposed to a full system, at least at first. Test the waters & all that.
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Old 01-16-2009, 11:53 AM   #6 (permalink)
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You shouldnt have a problem at all. Sticks of tubing are cheap. I think the Autoparts company I work for sells sticks of 1 1/2" 8 feet long for about 14 bucks.

Any exhaust shop will have a bender and a be able to bend up what you need. Get a set of OE brackets from Triumph and have them weld them on the pipe once you get the shape and look you need.

Depending on your tool situation you could almost build them yourself on a Speedmaster.

Take them to an Electroplater and have them plated and away you go.

Sounds like a fun project.
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Old 01-16-2009, 02:33 PM   #7 (permalink)
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How long would you say the total length of headers & Long Tors would be, which is the setup I have? I am trying to visualize where 68" would come out to...
Good tip on getting some OE hangers! I was thinking of fabbing some ...
I would go measure on my bike but I just got back out to work for the next 6 week
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Last edited by sharp21; 01-16-2009 at 02:45 PM.
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Old 01-16-2009, 06:43 PM   #8 (permalink)
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Sharp!!! I didn't realize you are only just down the highway from me. Are you working up North right now?

I am not sure how long those would be but the TORS would be the same length as the OE exhaust and alot of those Speedies exhausts go right to the rear tire.

If I get a chance I will whip into Echo with a tape measure for you and have a look. They have everything at the Bike show right now so it will probably be middle of next week.

BTW - I think Fountain Tire in Red Deer, the 67A St location, has a bender. I know them pretty well down there.
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Old 01-16-2009, 10:36 PM   #9 (permalink)
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you could fab your own brackets really easily out of some 14ga steel sheet. Take off the passenger pegs, mount the bracket to the outside of the pegs and run it to the pipe. That's how I'd do it on my bike, I'm not sure about the speedy/americas.
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Old 01-16-2009, 11:20 PM   #10 (permalink)
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On the SM you have to remove the lower bolt & loosen the upper one on the passenger footpegs. The bracket mounts in behind it then the footpeg support gets bolted back on over top of it. I would do it the same way.
Calliway, thanks for the heads up! My Tors come to about the rear axle. I want these pipes to come waaay out, like this:
http://www.cyclexchange.net/Exhaust%20System%20Page.htm
I saw them years ago & could never get them out of my head...
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