On Mar 18, 2:47*pm, Grider Pirate wrote:
On Mar 16, 4:48*pm, durabol wrote:

Thanks for the responses.

-I planned to have one carburetor (and crankcase) for both cylinders.

Shared carb and crankcase locks you into simultaneous firing of the
two opposing cylinders


Not necessarily. What you describe is commonly called a 'boxer'
configuration.

You can also alternate the cylinders. That can simplify a lot, for
instance
the cylinders can be joined to a common, rigid scottish yoke. That
will
also vibrate horribly and probably shake itself apart. But people
have
tried it, google for Bourke engine, which has a small cult-like
following
on line.

Maybe if you configured a Bourke with multiple banks of 2-cylinders
each, rotating each bank around the crank by 360/n degrees, where
n is the number of cylinders, that would smooth out the vibration
issue.
The result would be a sort of 2-stroke radial.