Question about expansion chamber size

[Patchy]

Just to check, you want an expansion chamber to be around the same volume as the cylinder/head/intake right? If you have an expansion chamber larger than said volume does it lesson the effectiveness of the chamber? Or is this not a concern?

I only ask because I stumbled upon an old thread...

In the thread the OP shows an exhaust that he modifies to fix the standard 66cc/48cc bike motors. Super simple to do too, But the exhaust has a pretty large chamber.

The Arrow Snake Pipe is also pretty big but I'm not sure if the two pipes are comparable.

Whats your thoughts on this guys?

 

[Theon]

The bigger the better,
Not true, but, depends what your after,
The pipe will be many times larger than the engines swept volume.
I have two KTM pipes on bikes that work real well.
The snake pipe looks better than the first pipe.

 

[Theon]

The China header is too restrictive for a decent pipe.

 

[PIGEONHAWK]

i agree but the puch is my vote

sub