tu-bit wrote:

why is the trailing spark plug hole smaller then the leading? thanks.

As the rotor rotates and the back apex seal passes the trailing spark plug
there is a large pressure difference between the moving combustion chamber
and the following compression chamber. If there were a large hole for the  trailing
spark
plug this pressure difference would result in a lot of leakage between
chambers. By the time the back apex seal gets to the leading spark plug
hole this is no longer the case.

Paul Lamar
 
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