FIELD: internal combustion engines. SUBSTANCE: internal combustion engine has at least one supercharger cylinder 1 and one working cylinder 15 located in engine unit. Pistons 2 and 16 mounted in cylinders form above-piston chambers. Pistons 2 and 16 are kinematically linked with crank mechanism. Cylinder head is provided with bypass passage 13 which brings in communication above-piston chambers of supercharger cylinder 1 and working cylinder 15. Spring-loaded bypass valve 14 is mounted in head for regular shutting-off of bypass passage 13. Spark plug is fitted in working cylinder 15 opposite bypass valve 13. Crank 17 linked with piston 16 of working cylinder 15 is shifted relative to crank linked with piston 2 of supercharger cylinder 1 towards advance in way of rotation of crankshaft 18 forming displacement angle of 5 to 45 deg between cranks. Cylinder block is provided with additional circulating cooling liquid chamber; between chambers 19 and 20 of circulating cooling liquid of supercharger cylinder 1 and working cylinder 15 there is heat-insulating partition 21. EFFECT: enhanced reliability. 1 dwg
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