Importance

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Abstract

An internal combustion engine comprising a cylinder having an exhaust port, a piston movable within the cylinder in a compression stroke, an exhaust valve for opening and closing the exhaust port, and a cam shaft including a cam member for selectively moving the exhaust valve between open and closed positions. The cam shaft includes a radially-extending opening positioned partially through the cam shaft. The engine further includes an auxiliary cam slidably positioned within the opening and movable radially between an operative position, where the exhaust valve is held open during the compression stroke, and an inoperative position. The auxiliary cam extends only partially through the cam shaft. The engine can further include an auxiliary shaft movably (e.g., rotatably) mounted within the cam shaft and adapted to move the auxiliary cam between the operative position and the inoperative position.

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First Claim