In this second video of the series on 2 stroke expansion chamber exhausts.
We look at how the exhaust port timing edge is determined by the port in relation to the top of the piston and how that translates to the Yamaha YPVS power valve system as well.

Then looking at how the wave velocity is effected by the gas velocity in the pipe and why it is important to distinguish between the two.

A reference to two books written on the topic of 2 strokes by Gordon Jennings and Gordon Blair and how I will refer to them.

And then we show some images of exhaust leaving an open pipe end using the Schlieren method to visualise the gas and acoustic waves.

Freeware 2 Stroke Expansion Chamber Exhaust calculator program
Download at http://birdcagesoft.com
(Page link on sidebar at site)

#2Stroke #ExpansionChamber