An air intake duct includes a peripheral wall, which is formed by a compressed fiber portion made of a compression molded fiber material. The compressed fiber portion includes high-compression portions having a high compression ratio and low-compression portions having a relatively low compression ratio. The high-compression portions include circumferentially extending sections. Each circumferentially extending section is located in a plane that is perpendicular to an extension direction of the peripheral wall with part of the circumferentially extending section disposed between the low-compression portions. Each circumferentially extending section extends continuously over the entire circumference of the peripheral wall.

A flow control member for a vehicle includes a body, a plurality of mounting tabs, and a panel member. The body has an outer surface and an inner surface. An air passage through the body is defined by the inner surface. A plurality of mounting tabs extends outwardly from the outer surface of the body. Each of the mounting tabs is configured to receive a fastener to connect the flow control member to an intake passage of the vehicle. A panel member is disposed in the air passage. The panel member defines a plurality of openings therethrough.

Various methods and systems are provided for an intake manifold for an engine. In one example, an insert comprises an annular body having a top surface, bottom surface, inner surface, and outer surface. The insert further comprises a first groove for coupling an intake air port of an intake manifold to a cylinder head, a second groove for circulating gaseous fuel received from a gas runner of the intake manifold, and one or more openings to fluidically couple the second groove to an interior of the intake air port. The insert is configured to mix gaseous fuel and intake air at a coupling location between the intake manifold and the cylinder head.

The present invention provides an intake manifold which can improve distribution of a drawn fluid among cylinders of an internal combustion engine without major changes. An intake manifold made of resin includes: an intake port 21 formed by welding together a base member 2 and a cover member 5 and adapted to take in outside air; a chamber 10 connected with the intake port 21 through a connecting passage 25 formed by including a cavity portion 50; and plural discharge ports 27 connected with one another through a branch passage branching from the chamber 10, wherein a shielding member 60 adapted to shield the cavity portion 50 and function as a wall surface of the connecting passage 25 is provided in the connecting passage 25.

An air duct for an air induction system of a combustion engine. The air duct includes an air duct, a frame and a hydrocarbon adsorbing member. The air duct housing including a first end and a second end. A fluid path extends between the first and second ends. The frame is disposed in the fluid path. The hydrocarbon adsorbing member is generally planar and is retained within the frame such that first and second opposing planar sides of the hydrocarbon adsorbing member are exposed to the fluid path. The housing may include a first portion carrying the frame. The hydrocarbon adsorbing element may be retained within the frame by a second portion of the housing.

An intake duct that includes a first flange projecting outward from an edge of the intake duct on a throttle body side. An intake manifold that includes a second flange projecting outward from an edge of the intake manifold on a throttle body side. A plurality of spacers is provided between the first flange and the second flange around the throttle body. The first flange and the second flange are fastened via the plurality of spacers in a state where the throttle body is held between the intake duct and the intake manifold.

A duct includes a circumferential wall. At least part of the circumferential wall is a fibrous portion that includes fibers. The fibrous portion includes a breathable inner layer located on an inner circumferential side in the circumferential wall and an outer layer located on an outer circumferential side of the inner layer in the circumferential wall. The outer layer is less breathable than the inner layer. A boundary between the inner layer and the outer layer is breathable.

An air intake manifold for an internal combustion engine having a top shell and a base weldment. The base weldment is formed by permanent joining of a bottom shell having a plurality of air outlets with a runner assembly having a plurality of runner components each having an air inlet and an air outlet, wherein the plurality of runner components are attached to one another via a support member to form the runner assembly.

An intake duct that includes a first flange projecting outward from an edge of the intake duct on a throttle body side. An intake manifold that includes a second flange projecting outward from an edge of the intake manifold on a throttle body side. A plurality of spacers is provided between the first flange and the second flange around the throttle body. The first flange and the second flange are fastened via the plurality of spacers in a state where the throttle body is held between the intake duct and the intake manifold.

An exemplary intake manifold may include an upper manifold configured to receive fresh air, an EGR tube configured to introduce exhaust gas into the upper manifold to be mixed with the fresh air, and a lower manifold configured to distribute the mixture of the fresh air and the exhaust gas cylinders of the internal combustion engine. The upper manifold may include an upper shell and a lower shell that may cooperate to define at least one channel in which at least a portion of the EGR tube may be secured.