Exhaust system for 4-cycle engine of small watercraft

A water vehicle comprising a hull defining an engine compartment, an internal combustion engine having an engine body and disposed within the engine compartment, a propulsion device driven by the engine, the engine including a plurality of exhaust ports arranged along first side of the engine body, an exhaust system configured to guide exhaust from the exhaust ports to the atmosphere, the exhaust system comprising an exhaust conduit extending from the exhaust ports to an exhaust discharge, the exhaust conduit comprising a plurality of individual exhaust passages communicating with the plurality of exhaust ports, respectively, the individual exhaust passages extending along the first side of the engine body and terminating in the vicinity of a longitudinal end of the engine body.

A water vehicle comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment, the engine having an engine body defining a plurality of exhaust ports arranged on a first side of the engine body, an exhaust system comprising an exhaust conduit extending from the exhaust ports to an exhaust discharge for discharging exhaust gases to the atmosphere, the exhaust conduit comprising an exhaust manifold connected to the exhaust ports, and a first exhaust passage extending from the exhaust manifold through a high point defining a highest elevation in the first exhaust passage, the first exhaust passage comprising a plurality of individual exhaust passages extending from the exhaust ports, respectively, the individual exhaust passages extending to the high point.

A water vehicle comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment, the engine having an engine body defining a plurality of exhaust ports arranged on a first side of the engine body, an exhaust system comprising an exhaust conduit extending from the exhaust ports to an exhaust discharge for discharging exhaust gases to the atmosphere, the exhaust conduit comprising an exhaust manifold connected to the exhaust ports, a first exhaust passage extending from the exhaust manifold through a first elevation and a second elevation, and a watertrap device connected to a downstream end of the first exhaust passage, the first elevation being lower than the exhaust ports, the second elevation being at least as high as the exhaust ports.

A water vehicle comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment, the engine having an engine body defining at least one exhaust port, an exhaust system comprising an exhaust manifold communicating with the at least one exhaust port, a first exhaust conduit extending from the exhaust manifold, a watertrap device connected to the first exhaust conduit, a second exhaust conduit connecting the watertrap device with an exhaust gas discharge, the first exhaust conduit extending to a first elevation defining a high point in the first exhaust conduit when the watercraft is inverted, the first exhaust conduit extending to a second elevation defining a high point in the first exhaust conduit when the watercraft is upright, the first and second elevations in the first exhaust conduit being disposed upstream from the watertrap device.

A water vehicle comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment and having an engine body defining a plurality of exhaust ports, an exhaust system comprising an exhaust manifold defining a plurality of exhaust runners communicating with the exhaust ports, respectively, a first cooling jacket member defining a cooling jacket around an exterior of the exhaust runners, a first exhaust conduit assembly having a plurality of individual exhaust gas conduits communicating with the plurality of exhaust runners, respectively, the individual exhaust gas conduits being connected to each other and having first and second ends, and a flexible cooling jacket member defining a cooling jacket around an exterior of the first exhaust conduit assembly, the cooling jacket member having a first end attached to the first end of the first exhaust conduit assembly, the second end of the first exhaust conduit assembly not directly attached to the second end of the first exhaust conduit assembly.

A water vehicle comprising a hull defining an engine compartment, an internal combustion engine disposed within the engine compartment and driving a propulsion device, the engine having an engine body defining at least first and second exhaust ports, an exhaust system comprising at least first and second exhaust passages having inlet ends communicating with the first and second exhaust ports, respectively, a downstream exhaust gas conduit having an inlet, the first and second exhaust passages having outlet ends connected to the inlet of the downstream exhaust gas conduit, the first and second exhaust passages having first and second lengths, respectively, the first and second exhaust passages having first and second diameters, respectively, the first length being greater than the second length, the first diameter being greater than the second diameter.

A water vehicle comprising a hull defining an engine compartment, an internal combustion engine disposed within the engine compartment and driving a propulsion device, the engine having an engine body defining at least first and second exhaust ports, an exhaust system comprising at least first and second exhaust passages having inlet ends communicating with the first and second exhaust ports, respectively, a downstream exhaust gas conduit having an inlet end, the first and second passages having outlet ends connected to the inlet end of the downstream exhaust gas conduit and defining first and second lengths, respectively, and a first restriction disposed at the outlet end of the first exhaust passage, the first length being greater than the second length.

A water vehicle comprising a hull defining an engine compartment, an internal combustion engine disposed within the engine compartment and driving a propulsion device, the engine having an engine body defining at least first and second exhaust ports, an exhaust system comprising at least first and second exhaust passages having inlet ends communicating with the first and second exhaust ports, respectively, a downstream exhaust gas conduit having an inlet, the first and second exhaust passages having outlet ends connected to the inlet of the downstream exhaust gas conduit, each of the first and second exhaust passages including a balance passage aperture defined between the inlet and outlet ends thereof, a cooling jacket in thermal communication with at least the first and second exhaust passages, and a balance passage connecting the balance passage apertures of the each of the first and second exhaust passages, at least a portion of the cooling jacket being upstream of the balance passage.

An exhaust manifold for an internal combustion engine having an engine body and a plurality of exhaust ports defined along a first side of the engine body, the exhaust manifold comprising a first exhaust runner assembly having at least two exhaust runners, each exhaust runner having an inlet end configured to engage a corresponding exhaust port and an outlet end, a second exhaust runner assembly having an inlet end configured to engage at least one of the exhaust ports.

A water vehicle comprising an internal combustion engine having an engine body and a plurality of exhaust ports defined along a first side of the engine body, and an exhaust system comprising a plurality of individual exhaust passages extending from the exhaust ports, respectively, and terminating in the vicinity of a forward end of the engine.

An exhaust system for an internal combustion engine having an engine body defining a plurality of exhaust ports arranged on a first side of the engine body, the exhaust system comprising an exhaust conduit extending from the exhaust ports to an exhaust discharge for discharging exhaust gases to the atmosphere, the exhaust conduit comprising a first exhaust passage extending through a high point defining a highest elevation in the first exhaust passage, the first exhaust passage comprising a plurality of individual exhaust passages having inlet ends configured to engage the exhaust ports, respectively, the individual exhaust passages extending to the high point.

An exhaust system for an internal combustion engine having an engine body defining a plurality of exhaust ports arranged on a first side of the engine body, the exhaust system comprising a first exhaust passage extending from exhaust ports through a first elevation and a second elevation, the first elevation being lower than the exhaust ports, the second elevation being at least as high as the exhaust ports.

An exhaust system for an internal combustion engine of a watercraft, the engine having an engine body defining at least one exhaust port, the exhaust system comprising an exhaust manifold communicating with the at least one exhaust port, and an exhaust conduit extending from the exhaust manifold to a first elevation defining a high point in the exhaust conduit when the watercraft is inverted, the exhaust conduit extending to a second elevation defining a high point in the exhaust conduit when the watercraft is upright.

An exhaust system for an internal combustion engine having an engine body defining a plurality of exhaust ports, the exhaust system comprising an exhaust passage having a plurality of individual exhaust gas conduits communicating with the plurality of exhaust ports, respectively, the individual exhaust gas conduits being connected to each other and having first and second ends, and a flexible cooling jacket member having first and second ends and defining a cooling jacket around an exterior of the individual exhaust gas conduits, the first end of the cooling jacket member being connected to the first end of the individual exhaust gas conduits, the second end of the cooling jacket member not being directly connected to the second end of the individual exhaust gas conduits.

An exhaust system for an internal combustion engine having an engine body defining at least first and second exhaust ports, the exhaust system comprising at least first and second exhaust passages communicating with the first and second exhaust ports, respectively, the first and second exhaust passages having first and second lengths, respectively, the first and second exhaust passages also having first and second diameters, respectively, the first length being greater than the second length, the first diameter being greater than the second diameter.

An exhaust system for an internal combustion engine having an engine body defining at least first and second exhaust ports, the exhaust system comprising at least first and second exhaust passages communicating with the first and second exhaust ports, respectively, first and second exhaust passages having first and second links, respectively, and a first restriction disposed at an outlet end of the first exhaust passage, the first length being greater than the second length.

An exhaust system for internal combustion engine having an engine body defining at least first and second exhaust ports, the exhaust system comprising at least first and second exhaust passages having outlet ends and inlet ends communicating with the first and second exhaust ports, respectively, each of the first and second exhaust passages including a balance passage aperture defined between the inlet and outlet ends thereof, a cooling jacket in thermal communication with at least the first and second exhaust passages, and a balance passage connecting the balance passage apertures of the each of the first and second exhaust passages, at least a portion of the cooling jacket being upstream of the balance passage.