The dual function exhaust system attachment, which is preferably used with an all-terrain vehicle, includes a muffler, a silencing cap, and a sound-enhancing plug. In a quiet configuration, the silencing cap is mounted to conceal a primary outlet of the muffler. In a loud configuration, the sound-enhancing plug is mounted to conceal a secondary outlet of the muffler. A set of screw threads or sealing mechanism may be used to mount the silencing cap and the sound-enhancing plug. A primary perforated barrier, a solid barrier, at least one secondary perforated barrier, and a pipe section are positioned within a hollow structural body of the muffler to guide the exhaust gas flow from an inlet of the muffler to the primary outlet or the secondary outlet.

A muffler for an engine is provided. A muffler (50) according to an embodiment of the present invention includes a box-shaped housing (51), and a partition (56) that divides the inside of the housing (51) into a first chamber (61) and a second chamber (62). The partition (56) includes a main body portion (56a) in the form of a flat plate, and a concave portion (56b) that protrudes toward the second chamber (62). Exhaust gas, having flowed from an inlet (52a) of the housing (51) into the first chamber (61), passed a through hole (57) of the main body portion (56a), and reached one side in the second chamber (62), flows inside the second chamber (62) so as to bypass a second concave portion (56b2) of the concave portion (56b) and then passes the other side in the second chamber (62) to reach an outlet (53a) of the housing (51).

Systems and methods for an exhaust system for a gas turbine engine are provided. The exhaust system includes an eductor system adapted to receive a primary exhaust fluid. The eductor system includes a body that extends along a first axis, with a plurality of ducts spaced apart about a circumference of the body. Each of the plurality of ducts extend from the body along a second axis transverse to the first axis to define a plurality of eductor primary flow paths that terminate in a mixing chamber. The mixing chamber is adapted to receive a secondary cooling fluid and to mix the primary exhaust fluid with the secondary cooling fluid to create a mixed fluid flow.

A gas turbine engine includes a combustion section that generates combustive gases that form a primary exhaust flow and an exhaust system downstream from the combustion section. The exhaust system includes an eductor system that includes a body that extends along a first axis, and a plurality of ducts spaced apart about a circumference of the body. Each of the plurality of ducts define a plurality of eductor primary flow paths that terminate in a mixing chamber. The exhaust system includes a muffler system downstream from the mixing chamber that includes a plurality of baffles that cooperate to define a tortuous path and attenuate sound generated by the gas turbine engine. The exhaust system includes a housing that surrounds the eductor system and the muffler system such that the eductor system and the muffler system are contained within the housing.

An engine capable of reducing the content of hydrocarbon in exhaust gas is provided. When viewed parallel to cylinder center axes, tangential virtual lines extending from endpoints of curved port central axes along tangent lines of the endpoints pass intake valve ports, straight port central axes extending from the endpoints of the curved port central axes are further away from a partition wall than the tangential virtual lines, and intake air bent through curved ports passes straight ports and is sucked through the intake valve ports along the wall between the cylinders.

A muffler assembly including a central common active control valve may include a central body for guiding exhaust gas discharged from an engine to flow in bilateral directions in a branched manner, the central body comprising the active control valve disposed in a flow path of exhaust gas, and a pair of main mufflers, each separately disposed at opposite sides of the central body to exhaust exhaust gas introduced from the central body, in which the flow path and an exhaust path of the exhaust gas may be variable based on opening and closing of the active control valve.

An exhaust muffler to be attached to an engine body includes a casing that includes: a rear member facing the engine body and a front member opposing to the rear member while maintaining a gap between the front member and the rear member, the gap forming a path in which exhaust gas discharged from the engine body flows; at least one guiding member that is disposed in the gap of the casing, extends from the rear member to the front member, and has a through-hole into which a fastening member that fastens the casing to the engine body is inserted; and a catalyst holding member that holds a catalyst that purifies the exhaust gas and is accommodated in the gap of the casing while being supported by the at least one guiding member.

An air exhausting device includes a muffler internally divided into a plurality of chambers by a separator, an inlet pipe that couples an exhaust pipe of an engine to the muffler, and an outlet pipe that is a path to discharge an exhaust gas inside the muffler to outside air. The muffler is configured of an expansion chamber to which a downstream end of the inlet pipe opens, and a resonator chamber communicated with only the expansion chamber via a plurality of resonator pipes. Any of or both of lengths and thicknesses of the plurality of resonator pipes are different.

An exhaust silencer includes a housing defining an interior and a tube disposed in the interior and defining an opening. A gas-flow deflector is configured to heat shield an interior wall of the housing from exhaust gases exiting the opening. The deflector has a deflector plate and a riser. The riser has a first portion connected to the interior wall and a second portion connected to a backside of the deflector plate to suspend the deflector plate in the interior such that the backside is completely spaced from the interior wall to form an insulating airgap therebetween.

A muffler includes a first chamber, a second chamber, an extender tube, a reverse flow tube, and a separation chamber. The first chamber is coupled to an exhaust inlet of the muffler. The extender tube is coupled to the first chamber and the second chamber. The exhaust gas flows from the first chamber to the second chamber through the extender tube in a first direction. The reverse flow tube coupled to the second chamber. The exhaust gas flows through the second chamber from the extender tube to the reverse flow tube in a second direction different than the first direction. The separation chamber that provides spatial separation between the first and second chamber.