Exhaust system for outboard motor
AssigneeYamaha Motor Co., Ltd.
InventorsMasafumi Sohgawa, Atsushi Isogawa, Hiroaki Fujimoto
Life of this patent
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Abstract
A number of embodiments of exhaust systems for outboard motors wherein the exhaust ports of the engine discharge the exhaust gases to the atmosphere through an underwater high speed exhaust gas discharge. A trap device is provided for precluding the water from the underwater exhaust gas discharge entering the engine through its exhaust ports. This trap device includes a section that extends above the highest exhaust port of the engine for this purpose.
Claims40
An outboard motor comprised of a power head having an internal combustion engine having at least one exhaust port and a surrounding protective cowling and a drive shaft housing and lower unit depending from said power head and containing a propulsion device driven by said engine, an underwater exhaust gas discharge for discharging exhaust gases to the atmosphere beneath a body of water in which the associated watercraft is operating, and means for delivering exhaust gases to said underwater exhaust gas discharge from said exhaust port comprising a section extending vertically above the highest exhaust port of said engine for forming a trap to preclude water from entering said exhaust ports from said underwater exhaust gas discharge.
Dependencies are inferred from the claim text.