Exhaust system for engine powering a watercraft

A watercraft and exhaust system for a internal combustion engine powering said watercraft, said watercraft having a hull having a front end and a rear end and a water propulsion device, said engine connected to said hull and having an output shaft arranged to drive said water propulsion device, said engine having a body defining at least two cylinders, said cylinders having their axes lying in a common plane lying at an acute angle to a vertical plane and on one side thereof, an intake system extending from said body of said engine at an angle on the opposite side of said vertical plane from said common plane of said axes of said cylinders, said engine having an exhaust system for routing exhaust from each of said cylinders forwardly within said hull from said engine and then rearwardly to a discharge through said hull contiguous to said propulsion device, said exhaust system including at least one exhaust pipe extending under a portion of said engine between said engine and a bottom of said hull and through which the exhaust passes pass in a rearward direction relative to said watercraft.

A watercraft and exhaust system for a internal combustion engine powering said watercraft, said watercraft having a hull having a front end and a rear end and a water propulsion device, said engine connected to said hull and having an output shaft arranged to drive said water propulsion device, said engine having a body defining at least two cylinders, all of said cylinders of said engine having their axes parallel to each other and lying in a common plane offset from a vertical plane containing a rotational axis of said engine output shaft and on one side thereof, an intake system extending from said body of said engine at an angle on an opposite side of said vertical plane from said axes of said cylinders, said engine having an exhaust system for routing exhaust from each of said cylinders to a discharge, said exhaust system including at least one first exhaust pipe extends from said engine for routing exhaust from at least one of said cylinders, said at least one first exhaust pipe extending towards said front end of said watercraft and communicating with a second exhaust pipe extending in the direction from said front end of said watercraft to said rear end, a portion of said second exhaust pipe extending under a portion of said engine.

A watercraft and exhaust system for a internal combustion engine powering said watercraft, said watercraft having a hull having a front end and a rear end and a water propulsion device, said engine connected to said hull and having an output shaft arranged to drive said water propulsion device, said engine having a body defining at least two cylinders, said cylinders having an axis offset from a vertical plane and on one side thereof, an intake system extending from said body of said engine at an angle on an opposite side of said vertical plane from said axes of said cylinders, said engine having an exhaust system for routing exhaust from each of said cylinders to a discharge, said exhaust system comprising a first exhaust pipe and a second exhaust pipe and at least a portion of said first exhaust pipe extends along and vertically above a portion of said second exhaust pipe.

A watercraft comprised of a hull with a front end and a rear end, a water propulsion device for propelling said hull through a body of water, said water propulsion device positioned at least in part within said hull and near said rear end of said hull, an engine supported by said hull and positioned generally towards a front end of said watercraft from said water propulsion device and having an output shaft arranged to drive said water propulsion device, said engine having a body defining at least two cylinders formed in a common cylinder bank with their respective axes lying in a common plane, a first of said cylinders positioned towards an end of said body towards said front end of said hull and a second of said cylinders positioned towards an end of said body towards said rear end of said hull, said engine having an exhaust system defining an exhaust flow path from each of said cylinders to a discharge at said rear of said watercraft, said exhaust system including a waterlock arrangement positioned forwardly in said hull from said engine body, first and second exhaust conduits extending from said first and said second cylinders respectively to said waterlock arrangement for delivering exhaust gasses thereto, and an exhaust discharge conduit extending from said waterlock arrangement to the atmosphere through said hull at an area contiguous to said water propulsion device.