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AssigneeHonda Motor Co., Ltd.
InventorsJunichi ISHIDA, Masaaki NEGORO, Yosuke ARIGA, Takanori OSUKA, Tomiyuki SASAKI
Estimating the term…
A motorcycle includes an engine configured to expel an exhaust from combustion chambers of cylinders in a cylinder head through exhaust ports. Each of the cylinders is provided with a recessed portion provided in an exhaust passage wall surface in a central portion of an exhaust passage of a corresponding exhaust port. This makes it possible to maintain flow rate and flow velocity of the exhaust gas, and to decrease exhaust loss. As a result, it is possible to increase engine torque by use of a simple structure. In addition, no restriction is imposed on the layout of parts around the engine, because the recessed portions are provided in the exhaust ports.
An internal combustion engine which is configured to expel exhaust from a combustion chamber of a cylinder through an exhaust port of a cylinder head which is operatively connected to an exhaust pipe,
A cylinder head for an internal combustion engine, said cylinder head comprising an exhaust passage having a wall surface with a recessed portion formed therein and spaced away from adjacent parts of the exhaust passage wall surface, said recessed portion provided in a central portion of said exhaust passage.
A cylinder head for a multi-cylinder internal combustion engine having a plurality of cylinders, said cylinder head comprising an exhaust passage having a wall surface with a recessed portion formed therein for each of said cylinders, wherein each of said recessed portions is spaced away from adjacent parts of the exhaust passage wall surface, said recessed portion provided in a central portion of said exhaust passage for each of said cylinders.
Dependencies are inferred from the claim text.