Rotary internal combustion engine with pilot subchamber

A rotary engine (10) has an outer body (12) having an insert (34) located in the peripheral wall (18) of the outer body (12) offset from the rotor cavity (20) such that a portion (65) of the peripheral wall (18) extends between the insert (34) and the cavity (20). The insert (34) has a pilot subchamber (72) defined therein and the portion of the peripheral wall (18) has at least one opening (68) defined therethrough in communication with at least one outlet opening (74) of the insert (34) and with the cavity (20).