Injectors are disclosed for use in an underoxidized burner having a single or double stage internal combustion chamber (10) for receiving gaseous or liquid fuel such as diesel for mixture with air or oxygen and subsequent ignition by a spark plug. The injector includes feed conduits or tubes (46, 47) for simultaneously conducting air and fuel to a mixing device having a baffle (45) arrangement against which separately injected air and fuel impinge causing a complete air/fuel blending which is ignited, burned and exhausted. The injector may accept effluent gases for mixing with water to produce maximum hydrogen H2 from fuels. A laminar flow is produced which is folded over and reversed in direction within the combustion chamber.
