Quote:
Originally Posted by DannoXYZ
Greetings & Salutations!!! Welcome to Ninjette!!!
Mufflers don't do much on this bike for performance other than weight-savings. It's headers that make biggest gains; Tyga has highest power with their full-exhaust.
For mufflers, I played around with several aftermarket versions and modified their innards. What works best for noise-reduction with straight-through design is to have larger outer canister. When exhaust enters muffler, it expands through perforations. The more the expansion, more pulse-pressure variations are absorbed. Expansion also cools exhaust and shrinks volume. This draws flow back into centre core in 2nd-half of muffler and out rear. Also fill gap between inner core and outer chamber with fibreglass or stainless wool packing material.
I would try larger outer canister with thin wall-thickness. Aluminium or CF would give maximum weight-savings. The larger Tyga muffler was definitely quieter than smaller el-cheapo muffler I got from Ali. Smaller Ali muffler weighed 1390gm while Tyga with my Laguna Seca elbow weighs 1620gm.
Some photos and discussions here:
https://www.ninjette.org/forums/showthread.php?t=307767
https://www.ninjette.org/forums/showthread.php?t=338180
Good articles:
http://www.vaglinks.com/Docs/Misc/Mu...t_Section3.pdf
https://www.researchgate.net/publica..._vehicle_Noise
Might also consider cutting off kickstand bracket. At some point it will dig into ground and cause crashes. Great job on bike, your son is so lucky!  |
No need for jet kits, it's a fuel injected engine.
I'm making the silencer from 0,75mm steel. Bends easily, cheap, reasonably light and I can weld it. Inside piping is 0,9mm wall thickness 25mm pipes.
I was thinking of a section with hole pipes inside wool, then a 15cm chamber then a closed chamber with 2x26mm pipes going thru and to the exit.
edit. Unibat ULT1 is on order. Someone actually bought the previous ULT from me for 35€
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