Originally Posted by
cmulder
Looks like you created a primitive tuned pipe.
See if by making it longer or shorter you can find a "sweet spot" for the peak rpm you are looking for.
Originally Posted by
John_M_
That long straight pipe acts as a header, increased scavenging... what are you using for CDi.
No intention to "tune", but at the very least I get the feeling this "thing" that goes for a muffler is to say the least, extremely sub-optimal.
Since the engine is going to be used in a pusher config, but the muffler cannot be turned 180 degrees, it would end up transverse to the airflow, resulting in a lot of drag and turbulence.
Thinking about something better... But not now...