Quiet Needed!! Loud expansion chamber PIPE

You guys probably saw this post coming 5 miles out....or rather you heard me coming :bike:

I installed a Pocket Bike expansion chamber this weekend.

I'm done gushing about my new power (it's still amazing), now the reality of the new expansion chamber is setting in……this sucker is LOUD. I wouldn't mind if I lived in the country - but I'm afraid the neighbors will start griping. Sorta .226 machine gun fire - crack-crack-crack - slow idle is nice though. (Added beni, it even idles better than originally, surprisingly I had to back the idle screw off quite a bit) When idling it is not on the pipe - just flowing through, so to speak.

The source of this exhaust noise appears to be twofold. Per my ear nearby, part of it is my fittings up front - they are fairly loose. I can easily take it apart. Maybe expand the male half to make snug slip fit, on the male (steel) manifold I can use some exhaust system sealant goop, because that stubby steel flanged nipple could be tough.

The other is the so called silencer (it should be called a loudener) - it's not removable (welded to the pipe after the chamber itself). The silencer "cover" is riveted in place. To improve this one could be interesting. Drill out the rivets and stuff it? (I think it's empty inside). OR cut it off and attach an new quiet one?? Where is a silencer source? What will be left to clamp onto will be about 1" of or so 5/8"-7/8" OD stub. (I need to measure it)

I guess I'm open to any ideas as well as help finding a new silencer.

Thanks!

P

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A chamber in resonance is extremely loud HUH.

Stuff aluminum screen material in the silencer after you remove the rivets. then use screws to seal.
If your pipe to the chamber is leaky expand the ends of the tubes by hammering in a tapered plug, then a trial fit.
Lather , Rinse, Repeat.

A little louder I expected. Aluminum screen material? Interesting idea. I was thinking steel wool or fiberglass batting.

No need to hammer - I have a 20 ton press.

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I use aluminum screen in my homemade mousecan style muffler.
I did NOT like the POP POP POP. when I cut off my baffle.

I got a nice power increase and a pleasant rumbly sound.

I used a 1,5 to 2 inch exhaust pipe 45 degee I think,
Stuffed with aluminum screen material.
A length of plumbers tape and a 2 inch 14-20 bolt hold the end of the pipe and keep the screen in.
You are going to use a 20 ton press for finish work?

Sweet! Yeah that pop-pop-pop gets old real fast. It's not so bad at 40 mph, but.......I'm sure it is to observers.

I'll need to get some real Al screen. All I have is fake new age kind. That would melt and get nasty.

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When I top out the only thing I can hear is the air rushing past my ears.

No, to expand my copper fitting male ends:



For a tighter fit. I'll need to rig a mandrel, etc,

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Ok!
Nice pipe.

Norman makes some awesome silencers. He presses out some cups and rolls a tube and sticks them in it. Maybe we can take some pictures or maybe he can tell you how he does it. It really quietens it down. Just ask Cruiser......................

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