A gas injector for directly injecting a gaseous fuel into a combustion chamber of an internal combustion engine, including a valve closure element for releasing and closing a passage opening, the valve closure element opening in the direction of a flow direction of the gas injector, a sealing seat between the valve closure element and a valve body, a flow-guiding element being situated downstream of the sealing seat in the flow direction of the gas injector and configured to form a gas jet to be injected into the combustion chamber.

An outboard motor powerhead section includes an engine having vertically stacked cylinders. The engine includes intake passages extending through the cylinder head to the cylinders. A fuel rail extends along a vertical center axis alongside the cylinder head. Receiver cups are coupled to the fuel rail and vertically spaced from one another such that each receiver cup is associated with a respective cylinder. Each receiver cup has a respective connector passage providing fluid communication between the fuel rail and receiver cup. Fuel injectors are respectively coupled to the receiver cups. Each fuel injector has an inlet end located in a respective receiver cup and extends along a center axis toward a nozzle end that extends into a respective intake passage. A cowl covers the engine. The vertical center axis of the fuel rail is located relatively more inboard with respect to the engine than is at least one connector passage.

An outboard motor powerhead section includes an engine having vertically stacked cylinders. The engine includes intake passages extending through the cylinder head to the cylinders. A fuel rail extends along a vertical center axis alongside the cylinder head. Receiver cups are coupled to the fuel rail and vertically spaced from one another such that each receiver cup is associated with a respective cylinder. Each receiver cup has a respective connector passage providing fluid communication between the fuel rail and receiver cup. Fuel injectors are respectively coupled to the receiver cups. Each fuel injector has an inlet end located in a respective receiver cup and extends along a center axis toward a nozzle end that extends into a respective intake passage. A cowl covers the engine. The vertical center axis of the fuel rail is located relatively more inboard with respect to the engine than is at least one connector passage.

An early exhaust valve opening (EEVO) module increases a no-load engine speed so an engine can smoothly transition to driving a load when necessary. The EEVO module includes a drive piston engaging an injector rocker and a driven piston engaging an exhaust rocker. The pistons are fluidly connected by a activation fluid passage so that the drive piston compresses air in the passage when an injector cam rotates the injector rocker and causes movement of the driven gear and the exhaust rocker to open an exhaust valve to release exhaust energy during a piston expansion stroke to limit the energy transferred to a crankshaft. A low pressure timing valve may drain pressurized fluid from the passage during an initial portion of the movement of the drive piston so driven piston does not move to open the exhaust valve until a desired amount of energy has been transferred to the crankshaft.

A ducted combustion system includes a combustion chamber and a fuel injector in fluid connection with the combustion chamber, which includes an orifice opening from an injector tip of the fuel injector, the orifice injecting fuel into the combustion chamber as a fuel jet, the fuel jet flowing, within the combustion chamber, in a fuel flow direction. The system includes at least one duct disposed within the combustion chamber, the at least one duct being disposed such that the fuel jet, at least partially, enters one of the at least one ducts upon being injected into the combustion chamber. The at least one duct may be configured for having a flow field air stream within the duct, prior to entrance of the fuel jet, the flow field air stream having a flow direction that is substantially similar to the fuel flow direction.

A ducted combustion system includes a combustion chamber and a fuel injector in fluid connection with the combustion chamber, which includes an orifice opening from an injector tip of the fuel injector, the orifice injecting fuel into the combustion chamber as a fuel jet, the fuel jet flowing, within the combustion chamber, in a fuel flow direction. The system includes at least one duct disposed within the combustion chamber, the at least one duct being disposed such that the fuel jet, at least partially, enters one of the at least one ducts upon being injected into the combustion chamber. The at least one duct may be configured for having a flow field air stream within the duct, prior to entrance of the fuel jet, the flow field air stream having a flow direction that is substantially similar to the fuel flow direction.

In a fuel supply apparatus, an injector and a throttle valve are provided in a throttle body, and the fuel supply apparatus is disposed between an intake manifold and an air cleaner of a two-cylinder general-purpose engine and supplies fuel adjusted to a predetermined air-fuel ratio to both cylinders of the two-cylinder general-purpose engine by one injector. The throttle body includes a fuel supply unit having the injector and an air amount control unit having the throttle valve. The fuel supply unit and the air amount control unit are formed of separate components that can be separated or joined.

In a fuel supply apparatus, an injector and a throttle valve are provided in a throttle body, and the fuel supply apparatus is disposed between an intake manifold and an air cleaner of a two-cylinder general-purpose engine and supplies fuel adjusted to a predetermined air-fuel ratio to both cylinders of the two-cylinder general-purpose engine by one injector. The throttle body includes a fuel supply unit having the injector and an air amount control unit having the throttle valve. The fuel supply unit and the air amount control unit are formed of separate components that can be separated or joined.

A ducted combustion system includes a combustion chamber and a fuel injector in fluid connection with the combustion chamber, which includes an orifice opening from an injector tip of the fuel injector, the orifice injecting fuel into the combustion chamber as a fuel jet, the fuel jet flowing, within the combustion chamber, in a fuel flow direction. The system includes at least one duct disposed within the combustion chamber, the at least one duct being disposed such that the fuel jet, at least partially, enters one of the at least one ducts upon being injected into the combustion chamber. The at least one duct may be configured for having a flow field air stream within the duct, prior to entrance of the fuel jet, the flow field air stream having a flow direction that is substantially similar to the fuel flow direction.

A ducted combustion system includes a combustion chamber and a fuel injector in fluid connection with the combustion chamber, which includes an orifice opening from an injector tip of the fuel injector, the orifice injecting fuel into the combustion chamber as a fuel jet, the fuel jet flowing, within the combustion chamber, in a fuel flow direction. The system includes at least one duct disposed within the combustion chamber, the at least one duct being disposed such that the fuel jet, at least partially, enters one of the at least one ducts upon being injected into the combustion chamber. The at least one duct may be configured for having a flow field air stream within the duct, prior to entrance of the fuel jet, the flow field air stream having a flow direction that is substantially similar to the fuel flow direction.