updated 66cc Torque Pipe design

Discussion in 'Performance Mods' started by jaguar, May 15, 2015.

  1. jaguar

    jaguar Well-Known Member

    I finally found all the data I need to perfect my pipe design program and have used it to make this new design for a 66cc torque pipe that gives even more mid-range power. Use sheet 4 of my ECcalc Excel file to make the patterns for the pipe sections. The file is free to download from my site.
    Header length is measured from the piston skirt, along the mid-line of the header, till the beginning diffuser cone.
    Raising the exhaust port 1mm by way of a rotary tool is recommended if you want more RPM and top speed.

  2. jaguar

    jaguar Well-Known Member

    And here is the updated version for the 48cc: