FIELD: machine building.;SUBSTANCE: invention relates to reciprocating two-stroke internal combustion engines. Invention consists in that two-stroke internal combustion engine comprises crank mechanism and cylinder, inside of which nozzle and piston with oil scraper and compression rings are located, on cylinder cover there is an outlet valve. According to the invention, the cylinder comprises a blowdown chamber provided with a vent opening with a valve, and an upper end of the piston head at the bottom dead point and an oil scraper and compression rings at the upper dead point of the piston are located below the blowdown opening.;EFFECT: technical result consists in reduction of oil consumption and improvement of ecological characteristics of two-stroke internal combustion engine.;5 cl, 2 dwg
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