Rotary internal combustion engine with removable subchamber insert

A rotary engine comprising:

• an outer body having an internal cavity defined by two axially spaced apart end walls and a peripheral wall extending between the end walls, the peripheral wall having an insert opening defined therethrough in communication with the internal cavity, and a plurality of coolant passages defined through the peripheral wall in proximity of the insert opening, the coolant passages forming part of a cooling circuitry for circulating a liquid coolant therethrough;
• a rotor body rotatable within the internal cavity in sealing engagement with the peripheral wall and defining at least one chamber of variable volume in the internal cavity around the rotor body;
• and
• an insert removably received in the insert opening of the peripheral wall, the insert having a subchamber defined therein communicating with the internal cavity, a volume of the subchamber being at least 0.5% of a displacement volume defined as a difference between maximum and minimum volumes of the at least one chamber of variable volume, or the volume of the subchamber being from 5% to 25% of a combustion volume defined as a sum of a minimum volume of the at least one chamber of variable volume and the volume of the subchamber;
• wherein a minimum width of the insert opening is defined along a direction of an axis of rotation of the rotor body, the minimum width of the insert opening being at least 0.75 inches.