Self-ignited mixture compressing internal combustion engine and method of operation

The engine has an insert (1) engaged with a cylinder head (5), a main combustion space (7) in the cylinder, and a pre chamber (4) in the insert to mix a fuel gas and air into an atomized fuel. A nozzle (10) in the insert is coupled to a high-pressure fuel line, and injects fuel gas into the pre chamber. An injection opening (6) couples the pre chamber to the space, and passes the gas from the chamber to the space. An Independent claim is also included for a method of operating an internal combustion engine.