FIELD: engine and compressor engineering. SUBSTANCE: when gas is supplied under pressure cylinder 1 is filled through ports 13 from receiver 16. When pistons 2 and 3 approach the top dead center spark plug 6 is energized and gas-air mixture in prechamber 10 is ignited. Hot gases enter cylinder 1 and ignite the working mixture. The pressure produced moves pistons 2 and 3 allowing them to move back. The fluid is compressed in the compression spaces and buffer 8. Atmospheric air is sucked in blowing pump 9. When pistons 2 and 3 open ports 13 and 14 exhaust gases are discharged through branch pipe 17 and provide gas exchange inside cylinder 1. EFFECT: enhanced efficiency. 1 dwg
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