The method involves admitting a non-carburetted air through an air intake unit (16) in a combustion chamber (12) in a waste gas scavenging inlet mode, and admitting a carburetted air through another air intake unit (14) in the chamber at the end of scavenging. A carburetted air with specified fuel-air ratio is admitted through the intake units in the chamber in a waste gas scavengeless inlet mode. An independent claim is also included for an indirect injection internal combustion engine comprising a cylinder.
展开▼