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  #21  
Old 16th December 2013
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Jorgen

How do you think a Supertrapp would work after the Megaphone ?
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  #22  
Old 16th December 2013
Jörgen Jörgen is offline
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I know that one popular and good performing combo on hot street harleys is a large supertrapp behind the collector on a propipe (only using the header and collector from the Propipe).

So I would guess that it might work fine. However, I would consider running with an open end cap. The disc system is really restrictive unless you run a ridiculous amount of discs (very heavy and expensive).
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  #23  
Old 16th December 2013
NRHS Sales NRHS Sales is offline
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I did not realize Burns made street mufflers. That would be a real nice set-up I bet!!
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  #24  
Old 16th December 2013
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Quote:
Originally Posted by NRHS Sales View Post
I did not realize Burns made street mufflers. That would be a real nice set-up I bet!!
Oh, dont quote me on that! I just assumed from what Ive read and Ive seen burns on street bikes in pics, but I could be wrong on that. Ive always wanted a bike you could ride off the street on to a track, and noise laws are a lil more relaxed here I think.
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  #25  
Old 16th December 2013
rubine rubine is offline
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Quote:
Originally Posted by Jörgen View Post
A couple of things to remember.
Custom made burns systems are rare on oem engines, Not at least because there is a vast market of good off the shelf exhaust already availible.
It's another situation if you build or buy a taller xl engine. All of a sudden there are no exhausts availble on the market. Then Burns has the solution.


Rubine
Another thing to remember is that you still can make use of the Burns calculation regarding the headers and collector. Then fit a proper absorption type muffler behind the collector.
It's the area step inside the collector that ends the tuned (effective) length of the headers. The tuned lenght of the headers are still the same.
Just because Burns cataloque dont carry a muffler that you can use on your build, doesnt mean that you have to use their racing reverse cone megaphone.

But once again. If you run a stock height xl-engine, there are so many good performing of the shelf exhaust to choose from.
Oh my bike isnt stock at all, or wont be. Ive designed my own frame, Box tube with an arching backbone from the shock, im going to have electronically controlled adjustable riding position... Ive got hammer 660 cams and Hammer Dan hand ported STD raised port heads and everything else that goes with it so Id rather lean towards a more "racey" exhaust than street. Its not so much a daily commuter, more a balls out road bike. Heres the build thread

http://xlforum.net/forums/s....php?t=1666008

So Jorgen, Ive read after the collector doesnt matter so much, which is kind of what your saying. So whats important is from the heads to where the tuned length collects?
Im running a Ford V8 racing spec Coby muffler at the moment. So your advice is use the burns calcs, and after the collector do what is necessary for the bike.
Im going to build a custom anyways so may as well go with burns spec.

Last edited by rubine; 17th December 2013 at 07:42..
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  #26  
Old 16th December 2013
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Quote:
Originally Posted by rubine View Post
Oh my bike isnt stock at all, or wont be. Ive designed my own frame, Box tube with an arching backbone from the shock, im going to have electronically controlled adjustable riding position... Ive got hammer 660 cams and Hammer Dan hand ported STD raised port heads and everything else that goes with it so Id rather lean towards a more "racey" exhaust than street. Its not so much a daily commuter, more a balls out road bike. Heres the build thread

http://xlforum.net/forums/s....php?t=1666008

So Jorgen, Ive read after the collector doesnt matter so much, which is kind of what your saying. Whats important is from the heads to where the tuned length collects. Im running a Ford V8 racing spec Coby muffler at the moment. So your advice is use the burns calcs, and after the collector do what is necessary for the bike.
Im going to build a custom anyways so may as well go with burns spec.
Ahh! Thanks! Interesting build!

Yes I would do that! Use the burns calcs including the collector, and the run a weld on transition to a proper muffler.

If you have space enough and use slip joint into the collector, you can build the longer of the two header designs. Because then you can always cut the ends of the headers before the muffler. If you discover that the peak power rpm of the exhaust needs be moved up.

It's easier to cut then add lenght.
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  #27  
Old 17th December 2013
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Quote:
Originally Posted by NRHS Sales View Post
I did not realize Burns made street mufflers. That would be a real nice set-up I bet!!
I got an email back from Burns and they said they dont make mufflers specifically for the street, but guys do use them on the street. The meg mufflers are straight through and 'relatively loud'
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Old 17th December 2013
NRHS Sales NRHS Sales is offline
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that was what I thought. They are not relatively loud, They are FRICKIN loud!!!
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  #29  
Old 17th December 2013
rubine rubine is offline
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[QUOTE=Jörgen;4669565]

If you have space enough and use slip joint into the collector, you can build the longer of the two header designs. Because then you can always cut the ends of the headers before the muffler. If you discover that the peak power rpm of the exhaust needs be moved up.
QUOTE]

Thanks Jorgen, Im not sure what you mean though could you please explain.
What is a slip joint? Is that like how a trumpet 'slides' so you can tune lengths?
By redline is going to be set around 6200rpm, quite low but thats how I want to have it.
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  #30  
Old 17th December 2013
Jörgen Jörgen is offline
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[QUOTE=rubine;4670340]
Quote:
Originally Posted by Jörgen View Post

If you have space enough and use slip joint into the collector, you can build the longer of the two header designs. Because then you can always cut the ends of the headers before the muffler. If you discover that the peak power rpm of the exhaust needs be moved up.
QUOTE]

Thanks Jorgen, Im not sure what you mean though could you please explain.
What is a slip joint? Is that like how a trumpet 'slides' so you can tune lengths?
By redline is going to be set around 6200rpm, quite low but thats how I want to have it.
Also called slip-on. Kept together by wire tabs and beehive springs.
With a 6200 redline i think the drawing with the short header lenght might be a little to high in rpm. Look at pics of other good performing buell and sportster exhausts.
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