FIELD: transport engineering; automobiles. SUBSTANCE: two screw rotors are placed in cylindrical bores of housing. Each rotor has two parts: first screw part with U-shaped screw tooth and screw cavity, and second part with semi-circular projection - rotor piston and semi-circular cavity Volume of last closed turn of cavity of rotor first part is used as combustion chamber, and semi-circular cavity of second part of each rotor is used as expansion chamber. Engine is furnished with hot air duct accommodating fuel injection nozzle. EFFECT: increased efficiency of internal combustion engine, reduced pollution of ambient atmosphere. 3 cl, 7 dwg
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