Patent ID: 6854439

Claim:
In an internal combustion engine having a cylinder and a piston movably disposed in said cylinder for reciprocal motion, a cylinder head secured over said cylinder and piston to form a combustion chamber, at least one intake port extending in said cylinder head and at least two intake valves mounted in said cylinder head for allowing air to be admitted into said combustion chamber, at least one exhaust port extending through said cylinder head and at least one exhaust valve mounted to said cylinder head for allowing exhaust gases to exit said combustion chamber, and a precombustion chamber housing an injector, the improved combustion system characterized by: said pre-combustion chamber having a plurality of transfer passages communicating with said combustion chamber; said transfer passages being circumferentially spaced about a centerline of said pre-combustion chamber; said centerline of said transfer passages being angularly inclined in two different planes about said centerline of said pre-chamber to provide rotation of air entering said prechamber about its centerline; said centerline of said pre-combustion chamber being approximately aligned with a centerline of said combustion chamber; said prechamber having its bottom tip facing said combustion chamber formed as a cup protruding into said combustion chamber; said piston has a deep central bowl, and a pair of open cavities separating the outside walls of said bowl from the interior walls of the piston skirt; said cavities being exposed to the crankcase of said engine block.