FIELD: mechanical engineering; two stroke internal combustion engines with carburation and separation of intake and exhaust processes. SUBSTANCE: internal combustion engine has crank mechanism, cylinder-piston group, fuel, lubricating, cooling and timing systems, housing, free movable partition set into movement by compressed air energy intake and exhaust ports in lower part of cylinder and intake and exhaust valve in upper part of cylinder. Timing system has spool with pushers opening intake and exhaust ports in lower part of cylinder. Pushers control intake and exhaust valves by means of camshaft with cams. EFFECT: reduced losses owing to reduction of internal and friction forces. 10 cl, 12 dwg
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