Outboard Marine Corporation

George T Gillespie

Gregory J Binversie

Paul W Breckenfeld

Wolfram Hellmich

Theodore J Holtermann

Peter W Brown

Francis A McGinnity

Robert L Niemchick

Erik R Jorgensen

Two-stroke engine piston bowl configurations

Disclosed herein is an internal combustion engine comprising a cylinder block, a cylinder, an exhaust port, an inlet port, and a cylinder head fixed to the cylinder block including a recess, a spark plug fixed in the cylinder head along an axis located in a plane bisecting the inlet port and the exhaust port and extending at an acute angle to the cylinder axis, a fuel injector fixed in the cylinder head between the cylinder axis and the inlet side and along an axis located in the bisecting plane and extending in parallel and offset relation to the cylinder axis in the direction from the inlet port to the exhaust port, and a piston moveably axially in the cylinder and comprising an outer surface extending in opposing relation to the cylinder head and including a deflector extending diametrically from and between the cylindrical wall in transverse relation to the plane bisecting the inlet port and the exhaust port and including a centrally located raised crown having therein an axially inwardly extending bowl, an exhaust side wall extending from and between the cylindrical wall and defining an axially inwardly extending exhaust pocket extending between the exhaust side wall and the cylindrical wall, and an inlet side wall extending from and between the cylindrical wall and in spaced relation to the exhaust side wall and defining an axially inwardly extending inlet pocket extending along the inlet side wall and the cylindrical wall.

Stratified combustion chamber for a cross-scavenged, two stroke,

Disclosed herein is a method of operating a two-stroke internal combustion engine so as to promote reduction in engine exhaust emissions, which two-stroke internal combustion engine includes a combustion chamber, a pump operable to periodically pump air unmixed with fuel into the combustion chamber, a fuel injector communicating directly with the combustion chamber and operable to periodically inject fuel unmixed with air directly in the combustion chamber to provide a fuel charge, an ignition system operable to periodically ignite the fuel charge in the combustion chamber, and an exhaust system including an exhaust manifold communicating with the combustion chamber and operable to produce, in the engine exhaust gas, a thermal reaction so as to reduce engine exhaust emissions, which method includes the steps of pumping air unmixed with fuel to the combustion chamber, injecting fuel unmixed with air directly into the combustion chamber so as to provide a fuel charge and at an injecting timing which is retarded from the optimum injection timing for minimum fuel emissions and fuel consumption in an engine without thermal reaction within the exhaust system and in an amount so as to provide an air to fuel ratio which is richer than the optimum air to fuel ratio for minimum HC emissions without a thermal reaction in the exhaust system, and igniting the fuel charge at an ignition timing which is retarded from minimum spark advance for best torque.

Reduced emission two-stroke engine and method of engine operation to

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Littlehampton, United Kingdom

George T Gillespie