kfx450
01-22-2010, 08:45 PM
I was playing around on the computer tonight and found a custom exhaust program for 2 strokes. Mainly geared towards carts but will work with any 2 stroke engine on expansion chamber size and length. I have found some very strange sizing for a 50cc engine and was wondering if people could give me some accurate numbers. So that I can give out the results just as a base line. I know most people won't make there own custom pipe but it is neet to see the numbers. I know most of the numbers for a 50 but could use better numbers for the Port Opening Deg. This program has other options like Diffuser styles and Fuel types. I was using gas and 3 stage diffuser. you can also change the width of the power band for different pipe length numbers.
Here is what I need.
#of cylinders
Bore mm
Stroke mm
Ex open period Deg
Main Transfer Open Period Deg
Sec Trans Open Period Deg
Rear Boost port Open Period Deg
Target HP
Target RPM@ Peak HP
Ex Port Exit Diameter mm
Ex Port +Exh Gasket Length mm
Will plug in your info and print out a Diagram to show.
thank you
jayme
Here is what I need.
#of cylinders
Bore mm
Stroke mm
Ex open period Deg
Main Transfer Open Period Deg
Sec Trans Open Period Deg
Rear Boost port Open Period Deg
Target HP
Target RPM@ Peak HP
Ex Port Exit Diameter mm
Ex Port +Exh Gasket Length mm
Will plug in your info and print out a Diagram to show.
thank you
jayme