Patent ID: 6591793
Filing Date: 2003-07-15
Classification: F02B,F02F

Abstract:
A two-cycle engine comprising:a crankcase having a crank chamber; a fuel intake port in communication with the crankcase, the fuel intake port being configured to provide a fuel mixture having a first fuel mass concentration to the crankcase; a cylinder having a combustion chamber with an upper end portion, the cylinder being coupled to the crankcase; an exhaust port in the cylinder; a first transfer port in communication with the crankcase and the cylinder, the first transfer port having a first opening into the cylinder, the first opening having a first upper edge; a second transfer port in communication with the crankcase and the cylinder, the second transfer port having a second opening into the cylinder, the second opening having a second upper edge, the second upper edge of the second opening being further away from the upper end portion of the combustion chamber than the first upper edge of the first opening; a piston reciprocally moveable in the cylinder and positionable to open or close the first and second openings and the exhaust port as the piston reciprocates in the cylinder; and a passage in communication with the first transfer port, the passage being configured to introduce a selected gas having a second fuel mass concentration into the first transfer port.