FIELD: mechanical engineering; engines. SUBSTANCE: engine has cylinder accommodating piston, cylinder head, working mixture intake and exhaust gas discharge members, main combustion chamber formed by cylinder, piston and head, two prechambers made in head for alternate communication with main combustion chamber through corresponding controlled valves. Volume of each prechamber is equal to 25-45 % of volume of main combustion chamber. EFFECT: enhanced reliability of operation. 1 dwg
