Catalyzer arrangement for engine

An internal combustion engine for an outboard motor having a protective cowling surrounding the engine, comprising a cylinder body in which a plurality of cylinder bores are spaced apart from each other, an exhaust manifold gathering exhaust gases from the respective cylinder bores, an exhaust passage being coupled to the exhaust manifold, the exhaust passage extending along the exhaust manifold so as to interpose the exhaust manifold between the exhaust-passage and the bores, the exhaust passage being positioned, at least in part, within a space defined between a side surface of the cylinder body and the protective cowling, and at least one catalyzer disposed in the exhaust passage.

An internal combustion engine for an outboard motor having a protective cowling surrounding the engine, comprising a cylinder body in which a plurality of cylinder bores are spaced apart from each other, an exhaust manifold gathering exhaust gases from the respective cylinder bores, an exhaust passage coupled to the exhaust manifold and extending, at least in part, within a space defined between a side surface of the cylinder body and the protective cowling, and a plurality of catalyzers disposed in the exhaust passage, the catalyzers being disposed in parallel with each other.

An internal combustion engine for an outboard motor having a protective cowling surrounding the engine, comprising a cylinder body in which a plurality of cylinder bores are spaced apart from each other, an exhaust manifold gathering exhaust gases from the respective cylinder bores, an exhaust passage coupled to the exhaust manifold and extending, at least in part, within a space defined between a side surface of the cylinder body and the protective cowling, and a plurality of catalyzers disposed in the exhaust passage, the catalyzers being disposed in series with each other.

An internal combustion engine for an outboard motor having a protecive cowling surrounding the engine, comprising a cylinder body in which a plurality of cylinder bores are spaced apart from each other, an exhaust manifold gathering exhaust gases from the respective cylinder bores, an exhaust passage coupled to the exhaust manifold and extending, at least in part, within a space defined between a side surface of the cylinder body and the protective cowling, the exhaust passage including a horizontal section extending generally horizontally along the side surface of the cylinder body, and a vertical section extending generally vertically along the side surface of the cylinder body, and at least two catalyzers, one of the catalyzers being disposed in the horizontal section, and another one of the catalyzers being disposed in the vertical section.

An exhaust gas purifying system for an internal combustion engine having a side surface, the system comprising an exhaust passage disposed on the side surface of the engine for catalytic exhaust treatment, the exhaust passage including a vertical section that extends generally vertically along the side surface of the cylinder body, and a horizontal section that extends generally horizontally along the side surface of the cylinder body, a catalyzer disposed within the vertical section, and an additional catalyzer disposed within the horizontal section.

An internal combustion engine for an outboard motor comprising an engine block defining multiple bores spaced apart from each other to form a bank, moveable members moveable within the respective bores to form multiple combustion chambers together with the engine block and the bores, the engine block defining an exhaust manifold gathering exhaust gases from the respective combustion chambers, the exhaust manifold extending generally along the bank to define first and second ends, the engine block further defining an exhaust passage coupled with the exhaust manifold at the first end of the exhaust manifold and extending generally along the exhaust manifold toward a location positioned adjacent to the second end of the exhaust manifold so that the exhaust manifold is interposed between the bank and the exhaust passage, and a catalyzer disposed in the exhaust passage.

An internal combustion engine for an outboard motor comprising an engine block defining multiple bores spaced apart generally vertically from each other, moveable members moveable within the respective bores to form multiple combustion chambers together with the engine block and the multiple bores, the engine block defining an exhaust manifold gathering exhaust gases from the respective combustion chambers, and an exhaust passage member extending along the engine block to define an exhaust passage communicating with the exhaust manifold, the exhaust passage comprising a horizontal section and a vertical section, the exhaust passage containing at least two catalyzers, one of the catalyzers being disposed within the horizontal section, and another one of the catalyzers being disposed within the vertical section.

An outboard motor comprising an engine having a cylinder body defining a plurality of cylinder bores, an exhaust manifold connected to the cylinder bores and configured so as to guide exhaust gases upwardly toward an upper end of the engine, an exhaust passage connected to the exhaust manifold and extending downwardly adjacent to the exhaust manifold so that the exhaust manifold is interposed between the cylinder bores and the exhaust passage, and a catalyzer being disposed in the exhaust passage.