Abstract: A reciprocating piston-type internal combustion engine includes an intake gas conduit assembly in which intake gas resonance oscillations are generated for increasing the charging efficiency of the cylinders. The intake gas conduit assembly has a feed resonance system including a feed resonator vessel connected with the intake ports of a group of cylinders whose suction strokes do not significantly overlap and a feed resonance pipe communicating with the feed resonator vessel. The intake gas conduit assembly further has an auxiliary resonance system including a closed auxiliary resonator vessel and an auxiliary resonance pipe opening into the auxiliary resonator vessel, an intermediate resonator vessel coupled with the auxiliary resonance pipe and the feed resonance pipe and an intake gas inlet pipe coupled with the intermediate resonator vessel.