Patent attributes
A two stroke crank case scavenged two-stroke internal combustion engine, the engine including: —a cylinder (2) configured to reciprocatingly receive a piston (6) therein defining a combustion chamber (8), the combustion chamber comprising an ignition means (5) for igniting an air/fuel mixture and an exhaust port (40) for evacuating the exhaust fumes, —a crank case (3) including a crank shaft (18), —an indirect fuel supply system (4), such as a carburettor (12) or a low pressure fuel-injection system, for supplying fuel to the crank case (3) to be scavenged to the combustion chamber (8), —at least one transfer duct (20, 20′) each extending from the crank case (3) to at least one corresponding transfer port (21, 21′) for connecting to the combustion chamber (8), —additional air filling means (25, 24, 27, 23, 23′, 22, 22′,26, 26′) for at least partly filling the transfer duct/s (20, 20′) with additional air from the transfer port (21, 21′) towards the crank case (3), —and a direct injection means (7) for injecting fuel directly into the combustion chamber (8).
