the present disclosure is related to an engine with entry ignition, comprising a compressor coupled to a pressure reservoir, wherein the pressure reservoir comprises a conduit connected to a mixing chamber wherein the mixing chamber comprises a fuel injector, and wherein the mixing chamber is coupled to a combustion chamber, a valve at the opening of the combustion chamber, wherein the valve is configured to open and close one or more channels between the mixing chamber and the combustion chamber, an exhaust valve at the opening of the combustion chamber. and a valve actuator connected to the exhaust valve.