Patent ID: 6511356
Filing Date: 2003-01-28
Classification: B63H,F01N,F02B,F02F,F02M

Abstract:
An outboard motor comprising an internal combustion engine and a support member arranged to support the engine, the engine including a cylinder block defining a plurality of cylinder bores, the cylinder bores extending generally horizontally and spaced apart vertically from each other to form a cylinder bank, the cylinder block further defining first and second exhaust manifolds extending generally vertically along side the cylinder bank, the first exhaust manifold being interposed between the cylinder bank and the second exhaust manifold, pistons reciprocating within the cylinder bores, and a cylinder head closing ends of the cylinder bores to define combustion chambers together with the cylinder bores and the pistons, the cylinder head further defining a plurality of exhaust ports and a plurality of exhaust passages, each one of the combustion chambers having at least one of the exhaust ports, each one of the exhaust passages communicating with one of the combustion chambers through at least one of the exhaust ports, at least one of the exhaust passages being connected to the first exhaust manifold, at least another one of the exhaust passages being connected to the second exhaust manifold, a top of the first exhaust manifold being positioned higher than a top of the second exhaust manifold.