FIELD: mechanical engineering; compression ignition engines with pistons moving in opposite directions. SUBSTANCE: proposed engine has combustion chamber with compression ratio changing under action of additional piston. Engine uses hydropneumatic system consisting of valve-type hydraulic distributor, hydropneumatic accumulator and gear pump building pressure of 80-100 kg/cm2. Compression ratio in combustion chamber can be changed from 6-7 to 20-23. EFFECT: improved reliability and increased economy of engine. 2 cl, 7 dwg
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