With reference to FIG. 2, the invention relates to an opposed stepped piston two-stroke engine comprising at least a first and a second cylinder, wherein the air piston is a stepped piston providing a first air transfer piston that expands and compresses a first air transfer volume to deliver air from the first air transfer volume to an air transfer system, and the exhaust piston is a stepped piston providing a second air transfer piston that expands and compresses a second air transfer volume to deliver air from the second air transfer volume to the air transfer system, each of the first and second air transfer volumes having an air inlet for receiving air; and wherein the air transfer system provides fluid connection between the respective first air transfer volume of each cylinder and the air port of another respective cylinder, via respective first air transfer conduits, and fluid connection between the respective second air transfer volume of each cylinder and the air port of the other respective cylinder, via respective second air transfer conduits, wherein the drive system is configured, for each cylinder, to have a predetermined phase angle such that one of the exhaust piston and air piston is driven before the other piston, causing delivery of air from its respective air transfer volume to the air transfer system before delivery of air occurs from the other of the air transfer volumes.

With reference to FIG. 2, the invention relates to an opposed stepped piston two-stroke engine comprising at least a first and a second cylinder, wherein the air piston is a stepped piston providing a first air transfer piston that expands and compresses a first air transfer volume to deliver air from the first air transfer volume to an air transfer system, and the exhaust piston is a stepped piston providing a second air transfer piston that expands and compresses a second air transfer volume to deliver air from the second air transfer volume to the air transfer system, each of the first and second air transfer volumes having an air inlet for receiving air; and wherein the air transfer system provides fluid connection between the respective first air transfer volume of each cylinder and the air port of another respective cylinder, via respective first air transfer conduits, and fluid connection between the respective second air transfer volume of each cylinder and the air port of the other respective cylinder, via respective second air transfer conduits, wherein the drive system is configured, for each cylinder, to have a predetermined phase angle such that one of the exhaust piston and air piston is driven before the other piston, causing delivery of air from its respective air transfer volume to the air transfer system before delivery of air occurs from the other of the air transfer volumes.

A mechanical engine cylinder system, includes a cylinder, an occupying structure with a cavity, and a crankshaft piston, the cylinder having a dedicated compression space and a dedicated combustion space, the occupying structure having a primary combustion space utilized during an early stage of a power stroke, wherein combustion pressure applied to the crankshaft piston during the power stroke is applied to a smaller surface area of the crankshaft piston during an early stage of the power stroke and to a larger surface area of the crankshaft piston during a later stage of the power stroke, the combustion pressure applied to the occupying structure applies a net-force to the occupying structure in the direction of the crankshaft piston during the early stage of the power stroke, and in the opposite direction of the crankshaft piston during the later stage of the power stroke.

A mechanical engine cylinder system, includes a cylinder, an occupying structure with a cavity, and a crankshaft piston, the cylinder having a dedicated compression space and a dedicated combustion space, the occupying structure having a primary combustion space utilized during an early stage of a power stroke, wherein combustion pressure applied to the crankshaft piston during the power stroke is applied to a smaller surface area of the crankshaft piston during an early stage of the power stroke and to a larger surface area of the crankshaft piston during a later stage of the power stroke, the combustion pressure applied to the occupying structure applies a net-force to the occupying structure in the direction of the crankshaft piston during the early stage of the power stroke, and in the opposite direction of the crankshaft piston during the later stage of the power stroke.

A two-cycle motor (10) has cylinder assembly (20) housing piston assembly (30) therein that moves reciprocally between two extreme positions controlled by a crankshaft. Cylinder assembly (20) includes combustion chamber (25) and an air compression chamber (45) in an enlarged annular portion (40). Portion (40) receives flange (31) integrally and radially outwardly extending from piston assembly (30) to define to air compression sub-chambers (47;47a). One-way inlet valve assemblies (41, 42) alternate to allow air in while outlet one-way valve assemblies (41a-42a) supply the compressed air to tank assembly (80) for release of the compressed air through intake one way valve assembly (29) to combustion chamber (25).

A two-cycle motor (10) has cylinder assembly (20) housing piston assembly (30) therein that moves reciprocally between two extreme positions controlled by a crankshaft. Cylinder assembly (20) includes combustion chamber (25) and an air compression chamber (45) in an enlarged annular portion (40). Portion (40) receives flange (31) integrally and radially outwardly extending from piston assembly (30) to define to air compression sub-chambers (47;47a). One-way inlet valve assemblies (41, 42) alternate to allow air in while outlet one-way valve assemblies (41a-42a) supply the compressed air to tank assembly (80) for release of the compressed air through intake one way valve assembly (29) to combustion chamber (25).

A mechanical engine cylinder system, includes a cylinder, an occupying structure with a cavity, and a crankshaft piston, the cylinder having a dedicated compression space and a dedicated combustion space, the occupying structure having a primary combustion space utilized during an early stage of a power stroke, wherein combustion pressure applied to the crankshaft piston during the power stroke is applied to a smaller surface area of the crankshaft piston during an early stage of the power stroke and to a larger surface area of the crankshaft piston during a later stage of the power stroke, the combustion pressure applied to the occupying structure applies a net-force to the occupying structure in the direction of the crankshaft piston during the early stage of the power stroke, and in the opposite direction of the crankshaft piston during the later stage of the power stroke.

A mechanical engine cylinder system, includes a cylinder, an occupying structure with a cavity, and a crankshaft piston, the cylinder having a dedicated compression space and a dedicated combustion space, the occupying structure having a primary combustion space utilized during an early stage of a power stroke, wherein combustion pressure applied to the crankshaft piston during the power stroke is applied to a smaller surface area of the crankshaft piston during an early stage of the power stroke and to a larger surface area of the crankshaft piston during a later stage of the power stroke, the combustion pressure applied to the occupying structure applies a net-force to the occupying structure in the direction of the crankshaft piston during the early stage of the power stroke, and in the opposite direction of the crankshaft piston during the later stage of the power stroke.

A piston-cylinder arrangement for an internal combustion engine includes a first cylinder bore in an engine with a first piston disposed therein. A combustion chamber may be positioned between walls of the first cylinder bore and the first piston. A second cylinder bore in the engine block may be aligned with the first cylinder bore with a second piston disposed therein. A compression chamber may be positioned between walls of the second cylinder bore and the second piston. One or more supporting members may connect the first piston to the second piston for facilitating concurrent reciprocation of the first piston and the second piston within their respective cylinder bores during operation of the internal combustion engine. The first piston, the second piston, and the one or more supporting members may define a stacked piston arrangement.

A piston-cylinder arrangement for an internal combustion engine includes a first cylinder bore in an engine with a first piston disposed therein. A combustion chamber may be positioned between walls of the first cylinder bore and the first piston. A second cylinder bore in the engine block may be aligned with the first cylinder bore with a second piston disposed therein. A compression chamber may be positioned between walls of the second cylinder bore and the second piston. One or more supporting members may connect the first piston to the second piston for facilitating concurrent reciprocation of the first piston and the second piston within their respective cylinder bores during operation of the internal combustion engine. The first piston, the second piston, and the one or more supporting members may define a stacked piston arrangement.