FOUR-STROKE RECIPROCATORY INTERNAL COMBUSTION ENGINE AND METHOD OF OPERATING SUCH AN ENGINE

摘要

A four-stroke reciprocatory internal combustion engine has a scavenging phase in which air is admitted under pressure into the cylinder and has a swirl generating phase in which a high-speed jet of air is admitted under pressure into the cylinder so as to swirl air fuel mixture charge in the cylinder around the cylinder axis. The engine has, in addition to an intake valve that controls induction of air fuel mixture into the cylinder, a separate air inlet valve which effects the scavenging phase and swirl generating phase.