An internal combustion engine comprising: at least two rotatable bodies; an outer body defining a respective internal cavity for each of the bodies, each of the bodies being sealingly and rotationally received within the respective internal cavity to each define at least one combustion chamber of variable volume undergoing a cycle defining successive phases of intake, compression, combustion and exhaust; at least one inlet port for each respective internal cavity, the at least one inlet port being in fluid communication with each of the at least one combustion chamber of the respective internal cavity at least during the intake phase thereof and a beginning portion of the compression phase thereof; at least one exhaust port for each respective internal cavity, the at least one exhaust port being in fluid communication with each of the at least one combustion chamber of the respective internal cavity during the exhaust phase thereof; a rotatable shaft, the bodies being drivingly engaged to the shaft in an angularly offset manner with the beginning portion of the compression phase of the at least one combustion chamber defined by each of the bodies being simultaneous with at least a beginning of the intake phase of the at least one combustion chamber defined by a different one of the bodies; a plenum for receiving pressurized air; and a respective conduit (62,64) providing a fluid communication between the at least one inlet port of the respective internal cavity of each of the bodies and the at least one inlet port of the respective internal cavity of the different one of the bodies, each respective conduit (62,64) being in fluid communication with the plenum; characterised in that: the at least one inlet port for each respective internal cavity includes a primary inlet port in fluid communication with each of the at least one combustion chamber during the intake phase thereof and the beginning of the compression phase thereof, and a secondary inlet port in fluid communication with each of the at least one combustion chamber during at least a beginning portion of the intake phase thereof, the respective conduit (62,64) providing a fluid communication between the primary inlet port of each of the bodies and the secondary inlet port of the different one of the bodies. at least two rotatable bodies; an outer body defining a respective internal cavity for each of the bodies, each of the bodies being sealingly and rotationally received within the respective internal cavity to each define at least one combustion chamber of variable volume undergoing a cycle defining successive phases of intake, compression, combustion and exhaust; at least one inlet port for each respective internal cavity, the at least one inlet port being in fluid communication with each of the at least one combustion chamber of the respective internal cavity at least during the intake phase thereof and a beginning portion of the compression phase thereof; at least one exhaust port for each respective internal cavity, the at least one exhaust port being in fluid communication with each of the at least one combustion chamber of the respective internal cavity during the exhaust phase thereof; a rotatable shaft, the bodies being drivingly engaged to the shaft in an angularly offset manner with the beginning portion of the compression phase of the at least one combustion chamber defined by each of the bodies being simultaneous with at least a beginning of the intake phase of the at least one combustion chamber defined by a different one of the bodies; a plenum for receiving pressurized air; and a respective conduit (62,64) providing a fluid communication between the at least one inlet port of the respective internal cavity of each of the bodies and the at least one inlet port of the respective internal cavity of the different one of the bodies, each respective conduit (62,64) being in fluid communication with the plenum; the at least one inlet port for each respective internal cavity includes a primary inlet port in fluid communication with each of the at least one combustion chamber during the intake phase thereof and the beginning of the compression phase thereof, and a secondary inlet port in fluid communication with each of the at least one combustion chamber during at least a beginning portion of the intake phase thereof, the respective conduit (62,64) providing a fluid communication between the primary inlet port of each of the bodies and the secondary inlet port of the different one of the bodies.