Exhaust Exhaust sizing

Discussion in '2-Stroke Engines' started by BikeProblems, May 12, 2011.

  1. BikeProblems

    BikeProblems New Member

    Hi there,

    I was wondering if anyone knew if the diameter and the length of the exhaust pipe would affect performance of the engine. Also does having an expansion chamber help or would it be better to have more of a straight through pipe, and somehow work out back-pressure problems/issues.


  2. retromike3

    retromike3 Member

    expansion chambers work

    When I put one on my bike I noted a huge difference. It effectively doubled my performance. The only thing that I found that was negative was that the power band was much more narrow. I have to modify the size of the pipe to get the power at a different RPM.

  3. spad4me

    spad4me Member

    Yes the length from the exhaust port to the first bell will affect the performance of a tuned pipe.
    Tuned pipe is the key word at resonance the sound and pressure waves inside the chamber will act like a supercharger.


    Large diameter inlet pipe, small or muffled output pipe. A stinger looking pipe on the end of rhe chamber.
    Last edited: May 12, 2011