Patent ID: 7614369

Claim:
An internal combustion engine comprising: an engine block having a cylindrical aperture therethrough, the cylindrical aperture having an enlarged first end portion defining a first precompression chamber and an enlarged second end portion defining a second precompression chamber; a first piston coupled to the block at the first precompression chamber and a second piston coupled to the block at the second precompression chamber; a cylinder having open ends and slidably disposed in the cylindrical aperture for reciprocating motion, the cylinder having a first combustion chamber that slidably engages the first piston and a first precompression member extending into the first precompression chamber, and a second combustion chamber that slidably engages the second piston and a second precompression member extending into the second precompression chamber; a first intake port fluidly connecting the first precompression chamber to the first combustion chamber and a second intake port fluidly connecting the second precompression chamber to the second combustion chamber; a first exhaust valve from the first combustion chamber and a second exhaust valve from the second combustion chamber; and a crankshaft drivably attached to the cylinder and adapted to convert the reciprocating motion of the cylinder into rotary motion; wherein the cylinder further comprises a central piston assembly disposed in the cylinder between the first combustion chamber and the second combustion chamber, such that the central piston assembly reciprocates with respect to the reciprocating cylinder.