Abstract: Various embodiments include two-stroke stratified engines and dual passage carburetors for use with gaseous fuel, such as hydrogen, methane, liquid petroleum gas, pure propane, and butane. A stratified air-head engine and low pressure fuel injected engines with fuel only tube is included.

Abstract: Various embodiments include engine carburetors. Various embodiments provide for methods of cylinder manufacturing engines. Various embodiments provide for methods of cylinder manufacturing four-stroke engines. Various embodiments provide for methods of cylinder manufacturing two-stroke engines.

Abstract: Various embodiments include engine carburetors. Various embodiments provide for methods of cylinder manufacturing engines. Various embodiments provide for methods of cylinder manufacturing four-stroke engines. Various embodiments provide for methods of cylinder manufacturing two-stroke engines.

Abstract: An integrally cast four-stroke engine mono-block (10) includes integrally cast cylinder block (20), cylinder head (40), and portion of a crankcase (30) including crankcase 10 outboard and inboard walls (89, 90). At least parts of outer and inner bearing bosses (21a, 21b) are integrally cast with the cylinder block (20) with the inner bearing boss (21b) integrally cast in the inboard wall (90). At least one cored out longitudinally extending open valve 15 train chamber (88) is disposed between the outboard wall (89) and the cast cylinder block (20).

Abstract: An integrally cast four-stroke engine mono-block (10) includes integrally cast cylinder block (20), cylinder head (40), and portion of a crankcase (30) including crankcase 10 outboard and inboard walls (89, 90). At least parts of outer and inner bearing bosses (21a, 21b) are integrally cast with the cylinder block (20) with the inner bearing boss (21b) integrally cast in the inboard wall (90). At least one cored out longitudinally extending open valve 15 train chamber (88) is disposed between the outboard wall (89) and the cast cylinder block (20).

Abstract: A two-stroke internal combustion engine includes at least one gaseous communication charge passage between a crankcase chamber and a combustion chamber of the engine and a piston to open and close the top end of the transfer passage. The air inlet port to the transfer passage for stratified scavenging is opened and closed by the piston that has passages and cutouts. The charge inlet to the crankcase chamber is opened and closed by the piston. The air and charge inlet passages are substantially asymmetrical to the layout of the transfer passages and are closer to one transfer passage compared to the other. The internal air passage in the piston is substantially perpendicular to the piston pin.

Abstract: In various embodiments, a metering apparatus may be associated with an engine. The metering apparatus may include a first passageway for transporting air to a first port of an engine, and a second passageway for transporting gaseous fuel to a second port of the engine.

Abstract: Various embodiments provide for methods of cylinder manufacturing engines. Various embodiments provide for methods of cylinder manufacturing four-stroke engines. Various embodiments provide for methods of cylinder manufacturing two-stroke engines.

Abstract: A two-stroke internal combustion engine includes dual transfer passages in gaseous communication between a crankcase chamber and a combustion chamber of the engine, an air passage through the crankcase to the crankcase chamber and in gaseous communication with a carburetor of the engine. A rotatable circular disk or crank-web is rotatably connected to a crankshaft. A piston may be used to open and close a top end of the passages. An air inlet port to the transfer passage for stratified scavenging is opened and closed by the crank-web that has passages and cutouts. The rotary valve replaces the one-way reed valve used in stratified scavenged and charged two-stroke engines. The air passes from lower ends of the transfer passages to top ends and into the crankcase through a piston passage, through the adjacent transfer passages directly, or through a passage in the piston into the crankcase.

Abstract: A two-stroke internal combustion engine includes at least one gaseous communication charge passage between a crankcase chamber and a combustion chamber of the engine and a piston to open and close the top end of the passage and a rotary valve to open and close the lower end of the transfer passage. The air inlet port to the transfer passage for stratified scavenging is opened and closed by the crank-web that has passages and cutouts. The rotary valve replaces the one-way reed valve used in stratified scavenged and charged two-stroke engines. The air passes from the lower end of transfer passage to the top end and into the crankcase through the piston passage, alternatively air may also pass through the adjacent transfer passage directly or through a passage in the piston into the crankcase. A two-stroke engine also consists of a charge injection system controlled by the crank web eliminating the one-way valve.