A device wherein rolling motion is obtained by energy obtained as a result of combustion of solid, liquid or gas fuel oil. The device has an elliptic disc installed onto a symmetric ball on a ball shaft in a body. A fuel oil injector inlet channel and ignition bobbin inlet channels are provided in the body. A rolling wall is installed onto the body and an exhaust outlet pipe. The rolling wall separates a symmetric body chamber into a suction chamber and combustion chamber. In one cycle rolling of elliptic disk, fuel-oil taken into the suction chamber is transferred to combustion chamber. Fuel oil taking and fuel-oil compressing and explosion thereof by ignition is conducted simultaneously and continuously and not interrupted.