The magnetic conductive cylinder block

I invent an extension to my piston/electro conversion engine, which uses the reverse solenoid action. Here we arrange the combustion chambers in a circle and create a single center conductive coil for some N number of piston-rod actions. Each rod serves as the revers solenoid in the N phase arrangement, and the rod is magnetic conduction, the cylinder block completes the magnetic circuit through the center winding.