FIELD: engine engineering. SUBSTANCE: engine has bank provided with a piston mounted for reciprocation with a connecting rod, rollers, compression and oil rings, combustion chamber formed with cylindrical projection of head of the bank and piston, inlet and outlet valves, and spark plug. The rollers received within the bank of the engine and contacting with outer surface of the piston are arranged uniformly over height of the piston from the beginning of top dead center. EFFECT: enhanced efficiency. 2 dwg
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