644 for integrating with other components of the engine fluidic communication between the mixing chamber 612 and the burning chamber 608 is provided with perforations 632 in a wall that defines the mixing chamber 612 similarly fluidic communication between the burning chamber 608 and the body expansion chamber 604 is provided with perforations 636 in a wall that defines the body expansion chamber 604 lower and upper sealing lips 616 and 620 enable a sealed connection to be established for a combustion gas supply passage 664 from the expansion chamber 648 to the rotary head the amount of fuel provided to the mixing chamber 612 from fuel injectors 652 may be controlled with a variety of methods known to those of skill in the art similarly the amount of oxidizer provided to the mixing chamber may be controlled by valves 656 from the air pump along the supply passage 624 ignition of the fuel oxidizer mixture is achieved within the burning chamber 608 with a spanker or glow rod 628 an air valve 660 to the atmosphere may advantageously used to provide an alternative oxidizer supply to initiate combustion specifically in embodiments where the engine is used to drive a vehicle air valve 660 may be open when the acceleration pedal is not pressed.