Gaseous fuel engine strategy biasing port fuel admission along flow streamlines

A method of operating an engine system comprising:

• feeding pressurized air through a manifold fluidly connected to a plurality of intake ports in an integrated cylinder head of an engine forming both a manifold cavity and the plurality of intake ports;
• opening and closing two intake valves for each of the plurality of intake ports to fluidly connect, in a serial and repeating inline firing order, each respective intake port to a cylinder in the engine via two intake valve openings;
• feeding the pressurized intake air through each of the plurality of intake ports while fluidly connected to the respective cylinder so as to define flow streamlines in each respective intake port extending to inward sides of the respective two intake valve openings;
• admitting a gaseous fuel to each of the plurality of intake ports;
• and
• advancing the gaseous fuel into the plurality of cylinders in a manner proportionally concentrated along the respective flow streamlines, such that the respective flow streamlines carry a relatively greater amount of the gaseous fuel into the respective two intake valve openings and other flow streamlines that extend to outward sides of the respective two intake valve openings carry a relatively lesser amount of the gaseous fuel into the respective two intake valve openings.

A gaseous fuel engine system comprising:

• an integrated cylinder head and intake manifold forming a manifold cavity fluidly connecting an intake air opening to a plurality of intake ports;
• the plurality of intake ports are each directly fluidly connected to the manifold cavity and extend to two intake valve openings structured to fluidly connect to a respective one of a plurality of cylinders in a cylinder block;
• a plurality of fuel admission tubes each having a curved profile and extending through the manifold cavity to a fuel outlet located in a respective one of the plurality of intake ports;
• and
• the plurality of fuel admission tubes are varied with respect to at least one of a fuel admission location or a fuel admission angle, relative to the respective two intake valve openings, and each respective one of the plurality of intake ports is equipped with a total of one fuel admission tube.