FIELD: engine engineering. SUBSTANCE: engine has crank gas exchanging chamber and cylinder with inlet blowing and discharging ports that are in communication with the crank chamber. The inlet port made in the cylinder wall is positioned so that the side wall of the piston can overlap it. The bottom part of the piston is provided with an outlet port and tab valve. The inner side of the inlet piston port is made up as a seat of the tab valve that is formed by a plate made of a flexible material rigidly connected with the top head of the connecting rod to permit the piston port to be closed when it moves upward from the top dead center to the bottom dead center and to permit the inlet port to be open when the piston comes back. The tabs of the valve are provided with an arrester. The top part of the arrester is secured to the top head of the connecting rod. The arrester is made up as a cantilever. The connecting rod head is provided with a boss. EFFECT: enhanced efficiency. 6 dwg
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