Internal combustion engine with monolithic pilot chamber structure

An apparatus for a powerplant, comprising:

• a pilot chamber structure formed as a monolithic body, the pilot chamber structure including an exterior surface, an interior surface, a pilot chamber, a pilot aperture, a fuel aperture and an ignitor aperture;
• the interior surface forming an outer peripheral boundary of the pilot chamber, and a surface texture of the interior surface different than a surface texture of the exterior surface;
• at least one channel projecting into a portion of the pilot chamber structure from the interior surface;
• the pilot chamber internal to the pilot chamber structure;
• the pilot aperture projecting into the pilot chamber structure to the pilot chamber;
• the fuel aperture projecting into the pilot chamber structure to the pilot chamber;
• and
• the ignitor aperture projecting into the pilot chamber structure to the pilot chamber.

An apparatus for a powerplant, comprising:

• a pilot chamber structure formed as a monolithic body, the pilot chamber structure including an exterior surface, an interior surface, a pilot chamber, a pilot aperture, a fuel aperture and an ignitor aperture, and a density of the monolithic body changing as the pilot chamber structure extends between the exterior surface and the interior surface;
• the interior surface forming an outer peripheral boundary of the pilot chamber;
• the pilot chamber internal to the pilot chamber structure;
• the pilot aperture projecting into the pilot chamber structure to the pilot chamber;
• the fuel aperture projecting into the pilot chamber structure to the pilot chamber;
• and
• the ignitor aperture projecting into the pilot chamber structure to the pilot chamber.