FIELD: mechanical engineering; engines with internal air cooling of cylinders. SUBSTANCE: air or fuel mixture is delivered into cylinder and cylinder air jacket. Main amount of air (fuel mixture) is delivered into air jacket in process of compression and at minimum compression ratio, delivery is cut off. Remaining amount of air (fuel mixture) is compressed to maximum compression ratio. Air (fuel mixture) from air jacket is delivered into cylinder in process of expansion when pressure is equal to pressure of air (fuel mixture). EFFECT: enhanced efficiency of working process of engine. 4 cl, 3 dwg
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