FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: engine has guide assembly installed between gas exhaust valves and gas turbine, and decompressor mounted in guide assembly. Connecting rods of pistons are provided with hydraulic compensators installed on ends of each connecting rod in engine crankcase. At engine starting decompressor open exhaust valves and engine is cranked by starter at no compression in cylinders. Two stage axial-flow gas turbine is arranged behind guide assembly. Exhaust valve control drive is made in form of cylinder with shaped working surface in contact with exhaust valve control rockers. Mechanism converting rotary motion into reciprocating motion of pistons is made in form of flywheel with cylindrical outer surface provided with profiled guide paths mechanically engaging with rollers of connecting rods. EFFECT: increased power output per unit weight, improved reliability in operation. 5 cl, 8 dwg
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