Supplemental fuel system for compression-ignition engine

A supplemental fuel system for a machine having a compression-ignition engine, the supplemental fuel system comprising:

• a nozzle configured to be positioned within a conduit of an air supply system for the compression-ignition engine, the nozzle having:
• a first inlet positioned at a first end thereof;
• an outlet positioned at an opposing second end thereof;
• a nozzle passage extending from the first end to the opposing second end that is configured to receive air flowing through the conduit, the nozzle passage having a non-uniform profile with a first transition point, a second transition point, an inlet taper linearly extending from the first end to the first transition point at a first angle, a mixing chamber extending straight between the first transition point and the second transition point, and an outlet taper linearly extending from the second transition point to the opposing second end at a second angle different than the first angle;
• and
• a second inlet positioned along the mixing chamber closer to the second transition point than the first transition point;
• wherein the inlet taper has a first longitudinal length and the outlet taper has a second longitudinal length;
• wherein a ratio of the second longitudinal length to the first longitudinal length is about 3:1;
• and
• wherein the nozzle is configured to generate a vacuum signal at the second inlet as the air flowing through the conduit flows through the nozzle passage to draw a flow of supplemental fuel from a supplemental fuel source into the mixing chamber.

A supplemental fuel system for a machine having a compression-ignition engine, the supplemental fuel system comprising:

• a nozzle configured to be positioned within a conduit of an air supply system for the compression-ignition engine, the nozzle having:
• a first inlet positioned at a first nozzle end thereof;
• an outlet positioned at an opposing second nozzle end thereof;
• a nozzle passage extending from the first nozzle end to the opposing second nozzle end that is configured to receive air flowing through the conduit, the nozzle passage having a non-uniform profile with a first transition point, a second transition point, an inlet taper extending from the first nozzle end to the first transition point, a mixing chamber positioned between the first transition point and the second transition point, and an outlet taper extending from the second transition point to the opposing second nozzle end, the inlet taper being different than the outlet taper;
• and
• a second inlet positioned along the mixing chamber;
• a stem having a first stem end and a second stem end, the first stem end interfacing with and is received by the second inlet of the nozzle, the stem configured to extend through a wall of the conduit such that the second stem end is positioned outside of the conduit;
• and
• a valve assembly including:
• a valve body defining a valve body inlet configured to receive a supplemental fuel from a supplemental fuel source and a valve body outlet interfacing with the second stem end of the stem such that the second stem end is received by the valve body outlet and the stem extends between and directly connects the nozzle and the valve body;
• and
• an adjuster positioned to facilitate selectively restricting an amount of flow of the supplemental fuel through the valve body outlet to the stem and the nozzle;
• wherein the nozzle is configured to generate a vacuum signal at the second inlet as the air flowing through the conduit flows through the nozzle passage to draw a flow of the supplemental fuel through the valve assembly and the stem into the mixing chamber.