FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: paired two-four stroke engine has two-stroke and four-stroke cylinders with common combustion chamber, intake valve, exhaust port arranged in wall of two-stroke cylinder, two crankshafts which set into motion the pistons connected by drive, ratio 1:2. Crank of four-stroke cylinder is installed with piston in top dead center. Crank with piston of two-stroke cylinder is installed, relative to four-stroke one, with 45 degree advance angle or angle near to this value from its top dead center. Piston displacement of both cylinders are equal to each other. Piston of four-stroke cylinder is installed by its working portion in common combustion chamber. EFFECT: enlarged operating capabilities. 4 cl, 12 dwg
