Twin cylinder two stroke engine - has annular compression chambers formed in stepped cylinders communicating via common inlet port

摘要

The twin cylinder two stroke engine has stepped pistons which are slidable in stepped cylinders, the lower part of the pistons and cylinders defining annular compression chambers. The upper part of each piston has a recessed portion adjacent the lower portion, and a common inlet port extends between the two cylinders. The rounded crown of each piston has a cut away portion on its side adjacent the inlet port. When one piston is at BDC and the othe is at TDC, compressed air passes into the cylinder to be exhausted via the common port. The air is guided by the recess in the piston at TDC and the cutaway portion in the crown of the piston at BDC.