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View Full Version : Any idea what this is on Byrd's bike


czrider263
06-02-2007, 06:57 PM
Just wondering if anyone knows what this is on his pipe?
czrider263
06-02-2007, 07:02 PM
Another....
czrider263
06-02-2007, 07:04 PM
.................

Kinda looks like an expansion chamber on the pipe? maybe it tunes the power band?
honda4life72
06-02-2007, 07:22 PM
saw in dirtwheels that same thing on pat browns bike, dasa made one for him as a prototype pipe to try and all i can guess is that they made one for byrds to ,
xcyfz450
06-02-2007, 07:23 PM
i belive thats what it is Dasa is experimenting with it
XCpred
06-02-2007, 07:24 PM
Yeah. It's something that DASA is trying out on their pro rider's bikes.
czrider263
06-02-2007, 07:32 PM
Yeah, but what does it do? Is it something new to help make power at the lower sound levels?
Vade
06-02-2007, 07:34 PM
Originally posted by czrider263
.................

Kinda looks like an expansion chamber on the pipe? maybe it tunes the power band?

Its a Horn ;)
czrider263
06-02-2007, 07:41 PM
Originally posted by Vade
Its a Horn ;)

Real funny!:ermm:
MX MaNiAc 06
06-02-2007, 08:50 PM
I also would like to know what that does? It looks very odd.
GPracer2500
06-02-2007, 09:52 PM
Nice find! It's a helmholtz resonance chamber. KTM has been using them on there factory enduro race motorcylces in Europe for a while now.

http://img168.imageshack.us/img168/6007/ktmexhaust2is1.jpg

They're used for tuning out sound waves. I predict we'll be seeing these more and more often. Anything that reduces sound without plugging up flow is a good thing. Some day I bet we'll have active noise cancelling that use similar chambers with variable volume to better reduce sound signature over a wide range of RPM.
TMSmx47
06-02-2007, 11:50 PM
^^^Exactly what he said above^^^

Its main thing is for sound supression.. Takes that 102db's down to the 98db limit.. Better then some other designs out there.. Ex: Disc type Super Trapp
FHKracingZ
06-03-2007, 01:36 AM
at kentucky, sparks had one on a jeremy lawsons bike as well !
czrider263
06-03-2007, 07:29 AM
Thanks for all the information... I just never seen them before.
rooster300ex
06-03-2007, 07:43 AM
So does it create more power or simply just quiet the quad down?
pro-rider46
06-03-2007, 06:44 PM
I think i saw in dirtwheels it made a little power but wasnt makin much
TMSmx47
06-03-2007, 09:00 PM
No power.. Just quiets it down..

PS.. Alex get your ***** to Sleepy for the District race this Sunday.. Its been forever!
pats2007450er
06-03-2007, 11:17 PM
it reduces sound without power lost.it adds a tad bit more hp.
esr250r86
06-03-2007, 11:39 PM
FHKracing were are you from?
FHKracingZ
06-03-2007, 11:50 PM
by chicago
czrider263
06-04-2007, 09:48 AM
Originally posted by TMSmx47
No power.. Just quiets it down..

PS.. Alex get your ***** to Sleepy for the District race this Sunday.. Its been forever!


UGGGGG.... i really want to get back to racing but school has been driving me insane!! i was going to go to the nascar race this weekend but i decided not to go because i have finals coming up on monday... As soon as school is over i will be back at sleepy.