This is the first video in a series looking at the science and mysteries of 2 stroke expansion chamber exhausts.

First we look at how the initial sonic compression wave is created during the blow down phase when the exhaust port just opens.

Then moving to the diffuser taper cone showing how the initial compression wave reflects a negative signed expansion wave back toward the cylinder to the open exhaust port to aid exhaust scavenging.

And then initial compression wave proceeds on at the local sonic velocity to the baffle cone taper and is then reflected back in the opposite direction toward the cylinder, meeting the exhaust port at the moment the pistons closes it to port plug escaping intake fuel air charge.

This video series will seek to explain exactly how those wave actions occur and the timing of them to match peak power output from a 2 stroke spark ignition engine thus unlocking huge gains in horsepower output..

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