Rotary internal combustion engine with pilot subchamber

A rotary engine comprising:

• a rotor sealingly received within an internal cavity of an outer body to define a plurality of combustion chambers;
• a pilot subchamber located in a wall of the outer body, the pilot subchamber in fluid communication with the internal cavity via at least two spaced apart transfer holes defining a flow restriction between the pilot subchamber and the internal cavity, the pilot subchamber in use in fluid communication with the combustion chambers as the rotor rotates;
• a pilot fuel injector in fluid communication with the pilot subchamber;
• an ignition element configured for igniting fuel in the pilot subchamber;
• a main fuel injector communicating with the internal cavity independently from the pilot subchamber;
• and
• wherein the pilot subchamber has a volume corresponding to from 5% to 25% of a sum of a minimum volume of one of the combustion chambers and the volume of the pilot subchamber.