FIELD: mechanical engineering; engines. SUBSTANCE: engine has compression chamber, gas to be compressed and first piston for compressing the gas by moving the piston in compression chamber; drive adapted for driving first piston in compression chamber for compressing the gas; expansion chamber and second piston providing expansion of gas in this chamber by moving second piston out of expansion chamber; device to deliver compressed gas from compression chamber into expansion chamber and heating device adapted for heating compressed gas from compression chamber. Transmission devices are functionally coupled with second piston to provide supply of power from engine. Device forming liquid jet in compression chamber is designed for cooling the gas in process of compression. EFFECT: increased fuel economy and enlarged operating capability of engine. 58 cl, 4 dwg
