A fluid-conduit collector (20, 20.x, 20.sup.a, 20.sup.b) spans across a plurality of collector-inlet interface structures (24, 24.1, 24.2, 24.3, 24, 24) and at least one fluidic diode element (26, 26.1, 26.2, 26.3, 26, 26). A branch inlet portion (20, 20.1, 20.2, 20.3) of at least one collector-inlet interface structure (24, 24.1, 24.2, 24.3, 24, 24), in fluid communication with a corresponding fluid-conduit runner portion (14, 14.x), provides for receiving fluid from a source of fluid (12). A main inlet portion (20.x) of the collector-inlet interface structure in fluid communication with an outlet portion (20.x) thereof defines a portion of the fluid conduit of the collector (20, 20.x, 20.sup.a, 20.sup.b). The branch inlet portion (20, 20.1, 20.2, 20.3) is in fluid communication with the outlet portion (20.x) via a collector inlet port (56, 106) that is at least partially bounded by a relatively-sharp-edged junction (60) with the fluid conduit of the collector (20, 20.x, 20.sup.a, 20.sup.b). The fluidic-diode element (26, 26.1, 26.2, 26.3, 26, 26) located coincident with, or downstream of, the collector inlet port (56, 106) provides for a relatively-higher coefficient of discharge for fluid flowing (34, 64) towards (36) an outlet (38) of the collector (20, 20.x, 20.sup.a, 20.sup.b), than for fluid flowing (32) in a reverse direction (40).

An exhaust manifold comprises a plurality of exhaust intake conduits structured to be fluidly coupled to an engine and receive exhaust gas from a corresponding cylinder of the engine. At least one exhaust intake conduit provides a reduction in an exhaust intake conduit cross-sectional area from an inlet to an outlet. A plurality of bends are each defined by a respective one of the exhaust intake conduit outlets. An exhaust intake manifold is fluidly coupled to the exhaust intake manifold and defines an exhaust intake manifold flow axis. Each of the plurality of bends is shaped so as to define an angle of approach of exhaust gas flowing therethrough. A first angle of approach of the first bend relative to the exhaust intake manifold flow axis is smaller than a second angle of approach of an inner second bend.

A snap-action valve assembly for an exhaust system is provided that includes a first conduit and a second conduit that are joined to together to define an exhaust passageway. A valve flap is disposed within the exhaust passageway for controlling exhaust flow. A shaft supports the valve flap in the exhaust passageway for rotation between open and closed positions. First and second bushings support the shaft. A pad made of wire mesh is attached to the valve flap. The pad includes an end portion that contacts the first or second conduit in the closed position and side wings that contact the first or second conduit in the open position. A resilient tongue may support the pad on an angle relative to the valve flap and a mass damper may be attached to one end of the shaft. These features dampen vibration and reduce valve flap flutter.

A conduit connection assembly including a first conduit part and a second conduit part, adapted to be assembled to form a conduit connection delimiting a first fluid conducting volume, wherein the conduit connection assembly presents a second fluid conducting volume, the first and second fluid conducting volumes being arranged to communicate with each other via a pressure change inducing device so as to form a common fluid guide, whereby during use of the conduit connection assembly the pressure in the first conducting volume is higher than the pressure in the second conducting volume, in that a cavity is formed between the first and second conduit parts at a distance from the first conducting volume, and a draining connection is adapted to provide a communication between the cavity and the second fluid conducting volume.

An exhaust system for an internal combustion automotive engine, such as a V engine or boxer engine, includes a left exhaust tract connectable to a left group of cylinders and a right exhaust tract connectable to a right group of cylinders. Each exhaust tract includes a tract structure defining a tract inlet for receiving exhaust gas ejected from the group of cylinders to which the exhaust tract is connectable, at least one exhaust outlet opening into the atmosphere, and a connection pipe extending between the tract inlet and the exhaust outlet. The connection pipe includes an inlet aperture for receiving exhaust gas from the tract inlet and an outlet aperture for transferring exhaust gas towards the exhaust opening. The left and the right connection pipes are joined to realize a pipe junction such that the connection pipes form a common connection aperture for transferring exhaust gas and the exhaust system includes at least one valve member for opening or closing the common connection aperture

The invention relates to line elements (600) consisting of a multi-layer inner element (IE) and an outer element (AE), wherein the inner element (IE) and the outer element (AE) are in contact with each other at points, at lines, over part of the surfaces thereof, or over the full surfaces thereof. Furthermore, a frictional contact protection means extending over the component length is provided, or a frictional layer (121) is provided in the contact region of the inner element (IE) and the outer element (AE). The wear of the outer element (AE) caused by friction can thereby be minimized.

An exhaust component comprises a main casing and at least one partial casing pressed against the main casing. In a developed state, the partial casing has an elongated shape along a longitudinal line and is defined along a transverse direction, substantially perpendicular to the longitudinal line, by two side edges opposite one another. The partial casing has a given developed longitudinal length. The partial casing has no fastening to the main casing on at least one longitudinal segment, and the longitudinal segment extends from one side edge to the other and extends in total over a cumulative developed longitudinal length of at least 20% of the given developed longitudinal length.

An exhaust gas pressure regulator for a combustion engine includes a regulator housing and an inner diffuser assembly arranged inside the regulator housing so that an exhaust gas flow duct is formed between an inner surface of the regulator housing and an outer surface of the inner diffuser assembly. The inner diffuser assembly includes a front portion and a regulating piston that is moveable relative to the front portion and the regulator housing between an idle position in which the exhaust gas flow duct is open, and a pressurized position in which the regulating piston at least partly closes the exhaust gas flow duct. The inner diffuser assembly includes at least one throttled flow passage between the gas flow duct and an exhaust gas pressure chamber defined by the regulating piston and an interior surface of the front portion.

The present disclosure relates to an engine system comprising an ICE; an exhaust system; and an engine control unit for controlling operation of the engine system between at least a first operating state resulting in a first exhaust temperature range, and a second operating state resulting in a second, higher, exhaust temperature range. The exhaust system comprises a low frequency sound attenuation portion including a first tubing section having a first flow area; a second tubing section, having a second flow area smaller than the first flow area; and a third tubing section having a third flow area greater than the second flow area. The low frequency sound attenuation portion is dimensioned to achieve laminar flow through the third tubing section when the engine system is in the first operating state; and turbulent flow through the third tubing section when the engine system is in the second operating state.

A snap-action valve assembly for an exhaust system is provided that includes a first conduit and a second conduit that are joined to together to define an exhaust passageway. A valve flap is disposed within the exhaust passageway for controlling exhaust flow. A shaft supports the valve flap in the exhaust passageway for rotation between open and closed positions. First and second bushings support the shaft. A pad made of wire mesh is attached to the valve flap. The pad includes an end portion that contacts the first or second conduit in the closed position and side wings that contact the first or second conduit in the open position. A resilient tongue may support the pad on an angle relative to the valve flap and a mass damper may be attached to one end of the shaft. These features dampen vibration and reduce valve flap flutter.