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Exhausts Exhausts - Headers, Mid Pipes, Mufflers


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February 11th, 2005, 12:10 AM   #1
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header pipe lengths way out. opinion?

just wondered whether anyone had measured the difference in the lengths of these two downpipes. they look way out?

certainly won't be good for power.

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Taffy
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February 11th, 2005, 05:36 AM   #2
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What header pipes Taffy?
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February 11th, 2005, 11:20 PM   #3
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Head Pipe Lengths

Yeah, I was just looking at the Husaberg brochure I have of the 98 models and I noticed that the bends and lengths of the head pipes vary between the different models (not only cc but model designation). I guess the pipes for the enduro model FE 's are tuned for more torque and the FC more top end. From the photos, the collectors on the works models are about even with the cylinder head but on the stock bikes they're back above the swing arm pivot.
I see the factory KTM supermoto bikes run twin pipes, I guess there is a power gain to be had that is worth the additional weight. Maybe I could Frankenstien together a set of twin pipes out of spare parts........
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February 12th, 2005, 02:38 AM   #4
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bergryder and simon

my mistake lads i didn't explain!

i meant that it appears that the factory are turning out bikes with uneven length downpipes and that is VERY BAD for power. if i'm right i'm amazed that nobody else has mentioned it and that nobody else is aware how much power this factory 'bodge' robs you of.

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Taffy
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March 21st, 2005, 03:58 AM   #5
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my understanding is that each pipe is optimised for power in a particular rev range, therefore uneven length header pipes give a wider spread of power over the rev range rather than peak power at one rev range or another.
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March 21st, 2005, 05:16 AM   #6
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it's my understanding that all things in an engine get "dragged down" to the lower point and infact don't even middle out at all.

do 8 oarsman work better in unison or with one oar always pulling in a multiblade rowing boat?

if you want more mid then you make them both work there and the same goes for top end.

to me it's a fudge that we owners have ignored but i trust a tuner wouldn't.

regards

Taffy

regards

Taffy
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March 21st, 2005, 08:01 AM   #7
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The unequal lengths are the least of your worries on the stock system

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March 21st, 2005, 05:52 PM   #8
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As mentioned, unequal length pis do infact offer a wider powerband. On v-8 engines, road races use different length intakes as well as different length header pipes to create a wide power band.

taffy is correct, you end up with less peak power, but you may have more USABLE power over a more broad rpm range that will provide more benefit than a sharply peaked power curve.
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March 21st, 2005, 08:18 PM   #9
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pipes

I think after all the big bores Taffy rode in Moab he is looking for that feel of the handelbars trying to leave him behind,Someone sell him a big bore kit or a stroker crank and he will have perma-grin again.
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March 21st, 2005, 09:15 PM   #10
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I this an issue on a single cylinder engine? It is a major issue on multi cylinder engines. These need to have all cylinders making the same power, but I don't think a single will be effected.
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