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Exhausts Exhausts - Headers, Mid Pipes, Mufflers


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November 16th, 2017, 01:30 PM   #11
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Thanks Doc, the system I'm using now the join is very close to the head and because of the angled ports is an absolute bastard to fit! I'm using a 2-1-2 system now, very heavy. The new idea is a single pipe and silencer with the diameter getting larger from the ports onward, ending in a 51mm straight through end can.
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November 16th, 2017, 01:35 PM   #12
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Just need a pipe bender and welder now then Canolman!
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November 16th, 2017, 02:08 PM   #13
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Originally Posted by plumbbob View Post
Just need a pipe bender and welder now then Canolman!
Or a local lad who designs systems for rally cars. Fills the pipes with gas before welding, stops the weld from penetrating. Perfectly smooth joins.
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November 16th, 2017, 11:53 PM   #14
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These are dimensions from double muffler made for german racing team by Ricardo engineering. More torque + noise reduction

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November 17th, 2017, 12:05 AM   #15
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Here you can see what some germans made years ago during winter time.
The did what you are talking about. Maybe not a serious help - more a fun comic:

mad mäxla e.V. supermoto & monkey club Kirchheim / Teck

Choose at menu: Projekte Boddle SM
Then: MAD MÄX 4 - 1 till MAD MÄX 4 - 13
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January 29th, 2018, 05:06 AM   #16
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1.2mm stainless stepping up in size finishing at 51mm into silencer. The pipe was filled with gas before welding, this gives a smooth join on the inside of the pipe.
I've yet to weigh it but it's significantly lighter than what I bodged on originally
Attached Thumbnails
Exhaust design?-20180129_122049.jpg   Exhaust design?-20180129_120342.jpg   Exhaust design?-20180129_120331.jpg   Exhaust design?-20180129_113629.jpg   Exhaust design?-20180129_113612.jpg  

Exhaust design?-20180129_113536.jpg  
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January 29th, 2018, 06:09 AM   #17
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Looks nice indeed, if its too loud you can just take the output diameter down without loosing any power and have it more quiet
2x35mm Inner diameter is enough for twice the engine volume without restricting output is what Ive found, take it for what you want.
For a v-twin, but 35 any day for a single.
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Last edited by TomTom; January 29th, 2018 at 06:29 AM.
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January 29th, 2018, 07:32 AM   #18
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Really nice welding job.
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January 29th, 2018, 09:53 AM   #19
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Looking good.
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January 29th, 2018, 11:26 PM   #20
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pipe lore

Hello Cano. Very cool project there. One imagines a racer like that is not overly concerned about low end power. But acceleration is essential. Long headers, as in prior to collector, give better mid-range and up pull. Short headers get you better low rev response. Your crossover or H pipe has to be right where the discolouration from exhaust heat stops. Thousands of rodders and racers run the engine as intended for while, then apply the H pipe in the right place. Gotta service a race bike all the time anyway. A single header pipe thinks the first restriction is the collector, so these work like a long header. Just not near as strong a pull as the dual pipes our Husabergs already have. You want all the volume you can get upstream of the collector. You sure you don't have space for a high pipe? Nice to get hot headers away from under the engine. Good luck, L
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