FIELD: manufacture of internal combustion engines. SUBSTANCE: method of operation of internal combustion engine is effected through admitting the air and mixture to the cylinder via two passages, compressing the admitted charge, separating the zone where chamber is located from the remaining portion of the combustion chamber by the piston stroke, igniting the mixture in the zone of the chamber and forcing the air out of the chamber via two passages towards each other, expanding and discharging the exhaust gases. Internal combustion engine has cylinder, piston, two intake passages, chamber in piston passing through the cylinder axis along passages, separating projections along chamber in the piston and in the head and passages in the air zone of the chamber directed towards each other. EFFECT: enhanced efficiency. 4 cl, 3 dwg
