Exhaust OCC muffler troubles

[Patch]

So right now...I have my muffler pointing straight up into my face. I can't get it around the crank without welding or buying the pipe from livefast


Should I have my frined's dad weld me one or would it be better to just buy one?

If he does weld should I just have it around the crank or should I bring it all the way back to the rear wheel like livefast's?

Thanks

 

[prowler]

OCC muffler options

Hey, someone else from Wis with a OCC chinese bike. I just put one together and ended up using an expansion chamber from a pocket bike along with a piece of conduit (3/4") bent with a conduit bender. It looks and works great. If you're around the milwaukee area let me know and maybe I can help you out. regards.

 

[SlicerDicer]

conduit??! seriously?!?! did you weld that... usually conduit is emt and gives off horrid gasses anyway. Well if it works it works

 

[Patch]

hey Prowler

Im actually in Waukesha right next to milwaukee

Although your Name kinda makes me think you're a creapy stalker killer


So did you just bend the conduit and chop the header from the included muffler and weld it on there? some pictures would be nice

 

[prowler]

muffler update

I purchased a pocket bike expansion chamber off of the Bay ($20) and lopped off the headpipe. Then I took the exhaust flange from the bike motor and cut it flush. Using the conduit bender, I bent a nice raduis that would transition from the exhaust flange under the bottom bracket of the bike and welded everything up (looks good, I think). For welding up conduit, it helps to wire wheel the galvanizing off the pipe before welding. Oh, forgot to mention that I painted the conduit black after welding so it'd match the chamber. I'll post some picts today if I get a chance.

 

[OldPete]

It is the fumes from the vaporizing zinc that are harmful.
Galvanizing should be ground off and the welding done in a well ventilated area.
Home welder/mechanics will set up a fan about 10' away to provide fresh air.

Looking forward to the pictars.

 

[prowler]

Here's the muffler using conduit for the headpipe.

 

[OldPete]

That looks tough...kinda like a little thug. I like it mucho-macho.

Note: Expansion chambers tend to be installed close to the exhaust port.

 

[prowler]

muffler

I was hoping to get the chamber closer to the exhaust port similar to the pocket bike, but it ran into the pedals, so had to mount it a little farther rearward. I'm guessing that since the volume of the engine displacement is about 6cc larger (15%) than the pocket bike, the additional volume of the head pipe prior to the chamber should still keep it tuned close to what it should be for WO performance(?).

 

[OldPete]

Life is filled with compromises, so do not worry. As long as it runs w/o 4 stroking your OK. (4 stroking is hit 'n miss engine ignition)

It does look good.