Air is fed through an auxiliary port of an internal combustion chamber at a high velocity of flow in a turbulence system. This enables mixture formation to be improved. Air flowing through the auxiliary port must be controlled. In the inventive gas flow control system, the main port gas flow (31) which circulates through the gas throttle port (34c) and the auxiliary port gas flow (12) are jointly regulated by the gas throttle (40). The gas flow control system is especially designed for automotive internal combustion engines.
