Abstract: An internal combustion engine having a pollution control system with a catalytic converter using a two-phase fuel system in which a small supply of flammable gaseous fuel is used for ignition and initial start-up of the engine. As the engine is warmed up and the catalytic converter is heated, the gaseous fuel is phased out and the liquid fuel is phased in.

Abstract: A lightweight engine block fabricated from a unitary, thermally conductive casting having at least one cylinder formed with a cylindrical wall in the casting with an upper cylinder section having an outer housing wall displaced from the cylinder wall around the upper cylinder section, wherein a reduced capacity annular water jacket is formed, and, a lower cylinder section having a plurality of outwardly directed cooling fins projecting from the cylinder wall at the lower cylinder section, wherein the cylinder is adapted to receive a piston and be enclosed by a cylinder head forming a combustion chamber with an upper high temperature section and a lower reduced temperature section, the upper high temperature section being encompassed by the upper cylinder section with the water jacket and the lower reduced temperature section being encompassed by the lower cylinder section with the cooling fins.

Abstract: An improved engine block and crankshaft bearing assembly with an arrangement of the engine block and the bearing assembly that simplifies casting of the engine block, with the block having cylinders and a crankcase with opposed spaced support structures in the crankcase for mounting thin profile, forged steel upper bearing caps between adjacent cylinders with the upper bearing caps spanning the spaced support structures and coupling to conventional bearing caps for at least the main bearings of the crankshaft between the end bearings.