An embodiment of an exhaust handling system for a marine vessel includes a cap connected to a top end portion of an exhaust stack of the marine vessel to form an enclosure at least partially surrounding an outlet of an exhaust pipe extending through the exhaust stack. In addition, the exhaust handling system includes a collection pipe in fluid communication with the cap such that the collection pipe is to receive exhaust from the enclosure, and a coupling connected to the collection pipe that is to connect to an exhaust cleaning assembly. The exhaust cleaning system includes a tank to receive the exhaust. The cap at least partially defines a first flow path for the exhaust that extends from the enclosure to the atmosphere. The collection pipe at least partially defines a second flow path for the exhaust that extends from the enclosure to the coupling via the collection pipe.

An exhaust system for a watercraft with an engine includes an upstream exhaust pipe including an end portion with an outlet, a water lock including an inner space accommodating the end portion, a downstream exhaust pipe connected to the water lock, and a flow direction diverter, such as a baffle. The upstream exhaust pipe guides exhaust gas from the engine to the end portion. The inner space of the water lock receives the exhaust gas from the outlet of the end portion. The downstream exhaust pipe exhausts the exhaust gas from the inner space to an outside of the watercraft body. The flow direction diverter changes a flow direction of the exhaust gas at the outlet to a cross direction which intersects a pipe axis of the end portion.

A stand-up type personal watercraft comprises a body including a deck and a hull; a standing deck which is provided at a rear part of the deck and on which a rider stands; and a pair of deck fins located on a left side and a right side of the standing deck, respectively, protruding upward, and extending in a forward and rearward direction, wherein the standing deck has a substantially rectangular shape when viewed from above.

A stand-up type personal watercraft comprises a body including a deck and a hull; a standing deck provided at the deck and located rearward relative to an engine room; a pair of deck fins located on right and left sides of the standing deck, respectively, and protruding upward; a muffler through which an exhaust gas from the engine flows; a first exhaust pipe which guides the exhaust gas from the engine to the muffler; and a second exhaust pipe which guides the exhaust gas outside from the muffler. The muffler is placed below the deck fin located on one side, and accommodated in the hull. The first exhaust pipe extends rearward on the one side from the engine and is connected to the muffler. A portion of the second exhaust pipe extends in a forward and rearward direction inside the deck fin located on the other side.

A marine vessel includes a hull, an engine, and an exhaust manifold including four upstream exhaust holes connected to four exhaust ports, respectively, one downstream central exhaust hole defined by two central upstream exhaust holes of the four upstream exhaust holes, two downstream side exhaust holes located downstream of the four upstream exhaust holes in an exhaust flow direction and spaced from and adjacent to the downstream central exhaust hole on both sides of the downstream central exhaust hole, and a water jacket. The water jacket is located in the exhaust manifold such that cooling water flows between the downstream central exhaust hole and the downstream side exhaust holes.

A marine vessel includes a hull, an engine, and an exhaust manifold including four upstream exhaust channels connected to four exhaust ports, respectively, one downstream central exhaust channel defined by two central upstream exhaust channels of the four upstream exhaust channels, two downstream side exhaust channels located downstream of the four upstream exhaust channels in an exhaust flow direction and spaced from and adjacent to the downstream central exhaust channel on both sides of the downstream central exhaust channel, and a water jacket. The water jacket is located in the exhaust manifold such that cooling water flows between the downstream central exhaust channel and the downstream side exhaust channels.

An embodiment of an exhaust handling system for a marine vessel includes a cap connected to a top end portion of an exhaust stack of the marine vessel to form an enclosure at least partially surrounding an outlet of an exhaust pipe extending through the exhaust stack. In addition, the exhaust handling system includes a collection pipe in fluid communication with the cap such that the collection pipe is to receive exhaust from the enclosure, and a coupling connected to the collection pipe that is to connect to an exhaust cleaning assembly. The exhaust cleaning system includes a tank to receive the exhaust. The cap at least partially defines a first flow path for the exhaust that extends from the enclosure to the atmosphere. The collection pipe at least partially defines a second flow path for the exhaust that extends from the enclosure to the coupling via the collection pipe.

An embodiment of an exhaust handling system for a marine vessel includes a cap connected to a top end portion of an exhaust stack of the marine vessel to form an enclosure at least partially surrounding an outlet of an exhaust pipe extending through the exhaust stack. In addition, the exhaust handling system includes a collection pipe in fluid communication with the cap such that the collection pipe is to receive exhaust from the enclosure, and a coupling connected to the collection pipe that is to connect to an exhaust cleaning assembly. The exhaust cleaning system includes a tank to receive the exhaust. The cap at least partially defines a first flow path for the exhaust that extends from the enclosure to the atmosphere. The collection pipe at least partially defines a second flow path for the exhaust that extends from the enclosure to the coupling via the collection pipe.