Internal combustion engine

摘要

A suction system for an internal combustion engine which is equipped with a sub-suction path provided separately from a main suction path for generating a swirl of the gases in a combustion chamber during the suction stroke. The amount of the air to be supplied via the sub-suction path to the combustion chamber is less than 40% preferably from 10 to 40%, more preferably from 20 to 30% of the total amount of the air to be supplied to the combustion chamber. Alternatively the effective area of the sub-suction path at its outlet end is 0.2 to 3.0% of that of the main suction path.