With 10 magnets around the circumference of the flywheel, one coil and set of points could fire the plugs with the flywheel also acting as the distributer. A ridgid steel tube/pipe on bottom of the piston could go through a brass bushing in a plate at the base of the cylinder that would seal the crankcase and charge the combustion chamber while the bottom of the tube would connect to 4 connecting rods to the master connecting rod going to the fifth cylinder. That would account for the large crankcase. It almost has to be a one of a kind prototype.
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