Abstract: The present invention relates to a combustion system of an internal combustion engine having a combustion chamber with two inlet openings and at least one outlet opening, an intake manifold for inducing mixture, two intake ports bifurcated from the intake manifold and communicated with the corresponding inlet openings and a swirl control valve disposed in the intake manifold. The combustion system has an improvement wherein a side passage in a spiral shape for guiding the mixture by bypassing the swirl control valve is formed along with the intake manifold and one of the intake ports from an upstream side of the swirl control valve to the inlet opening. The swirl control valve is arranged with a predetermined inclination so as to position an edge of the swirl control valve facing to the side passage to the upstream side of the other edge of the swirl control valve when the swirl control valve is fully closed.

Abstract: A system for correcting the supercharging pressure of an internal combustion engine having a supercharging device. A bypass is provided for bypassing a turbine of the supercharging device, a valve is provided in the bypass and an actuator for the valve is provided. The actuator comprises a housing partitioned by a first diaphragm into a supercharging pressure chamber and a first atmospheric pressure chamber, the supercharging pressure chamber communicating with the intake passage at the downstream side of the supercharging device; a first connecting rod operatively connects the first diaphragm to the valve so as to operate the valve. A compensating device is provided for offsetting the operating force by the atmospheric pressure.