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Old Jul 14th 2017, 12:49 AM   #1
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Design theory wsbk exhaust

Ok , you engineers , what is the design theory behind the last edition of exhaust being campaigned by the WSBK bikes ?
Looks to me 60mm to 70mm then finishing into split 51mm tubing . The headers aren't equal length with the front header actually looping the long way around the rear header . The rear header quite quickly becomes 70mm as aposed to the front . I'm looking at fabricating something as close to this as possible .
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Old Jul 14th 2017, 02:28 AM   #2
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Subscribing out of interest. One side is narrower than the other at the exit point. Presumably due to velocity of the gases and the different lengths?
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Old Jul 14th 2017, 02:36 AM   #3
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Originally Posted by royal View Post
Subscribing out of interest. One side is narrower than the other at the exit point. Presumably due to velocity of the gases and the different lengths?
Also there is a flapper valve between the two. I suspect that is closed when low in the revs , and opens at higher revs . Interesting stuff.
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Old Jul 14th 2017, 02:40 AM   #4
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Keep in mind that it s 2:1:2 , so the headers become one and the dual exit is to expel the gas from the single . I believe the headers and their design to the collector is the important part .
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Old Jul 14th 2017, 05:53 AM   #5
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...ask Orange County Choppers
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Old Jul 14th 2017, 06:45 AM   #6
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this discussion is above my pay grade
gecko or endo
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Old Jul 14th 2017, 06:59 AM   #7
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...endo definitely, but i feel a headache coming on...."please pass the Excedrin"
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Old Jul 14th 2017, 07:05 AM   #8
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I believe that Ducati changed the exhaust when regulations raised the DB limit on the bikes, which allowed Ducati to eliminate the mufflers in favor of (pretty much) straight pipes.

Lengthening the exhaust pipes, which I am sure that you guys have seen on other bikes (RSV4), can improve low end torque, which is essential getting out of corners.
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Last edited by BadBoyBeltran; Jul 14th 2017 at 07:23 AM.
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Old Jul 14th 2017, 07:36 AM   #9
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[theory] maybe the different header length compensates for the different flow on the air entry side based on the asymmetrical arrangement of the throttle bodies relative to the air entry point. [/theory]

not that i would call that beneficial, but what do i know...
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Old Jul 14th 2017, 07:37 AM   #10
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Originally Posted by BadBoyBeltran View Post
I believe that Ducati changed the exhaust when regulations raised the DB limit on the bikes, which allowed Ducati to eliminate the mufflers in favor of (pretty much) straight pipes.

Lengthening the exhaust pipes, which I am sure that you guys have seen on other bikes (RSV4), can improve low end torque, which is essential getting out of corners.
...they also stuck DSC and DTC in the mix
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