Pre-combustion chamber assembly with ignition electrodes for an internal combustion engine

A pre-combustion chamber assembly for an internal combustion engine, including:

• a pre-combustion chamber body,
• a pre-combustion chamber defined within the pre-combustion chamber body,
• a first electrode, and
• a second electrode;
• the pre-combustion chamber body including:
• a thermally conductive body portion, and
• a nozzle portion, the nozzle portion including at least one flame outlet;
• the pre-combustion chamber being arrangeable in use in fluid communication with a combustion chamber of the engine via the at least one flame outlet;
• the first and second electrodes being connectable to an ignition system of the engine to produce a spark within the pre-combustion chamber between the first and second electrodes when energised by the ignition system;
• the thermally conductive body portion of the pre-combustion chamber body being arranged or arrangeable in use within an engine body component of the engine, outside the combustion chamber, to transfer heat to the engine body component in use;
• wherein a first electrode aperture extends through the thermally conductive body portion of the pre-combustion chamber body, the first electrode aperture having an inner end opening into the pre-combustion chamber and an outer end opening outside the pre-combustion chamber,
• the first electrode being electrically insulated from the pre-combustion chamber body and mounted or mountable to extend in use through the first electrode aperture into the pre-combustion chamber;
• and
• wherein a second electrode aperture extends through the thermally conductive body portion of the pre-combustion chamber body, the second electrode aperture having an inner end opening into the pre-combustion chamber and an outer end opening outside the pre-combustion chamber;
• the second electrode being arranged in the second electrode aperture to extend along an adjustment axis from the inner end of the second electrode aperture towards the first electrode;
• the second electrode being positionally adjustable along the adjustment axis relative to the first electrode and relative to the pre-combustion chamber body while the pre-combustion chamber body is disposed within the internal combustion engine.