An intake duct for an internal combustion engine includes a tubular side wall. The side wall includes a first molded body and a second molded body that are separate from each other in a circumferential direction of the side wall. The first molded body includes first and second joints. The second molded body includes first and second joints. The first and second joints of the first molded body and the first and second joints of the second molded body are joined to each other. The first molded body includes a rib protruding toward the second molded body and extending in an axial direction of the side wall. The rib is located inward from the first and second joints of the first molded body. The second molded body includes an accommodation recess that accommodates the rib. The accommodation recess is located outward from the rib.

An intake system component for an internal combustion engine includes a tubular curved portion extending in a curved manner. The curved portion includes an inner wall located on an inner side of a curve relative to an inner passage. The inner wall is made of a breathable fibrous molded body. A part of the curved portion excluding the inner wall includes a portion having a lower breathability than the inner wall.

A turbo duct is disclosed that includes a primary body having an inlet end, an outlet end, and an internal air passageway that communicates therebetween. An anti-crush ring is operably associated with at least one of the inlet and outlet ends. The inlet and outlet ends of the primary body are dimensioned to receive a cuff for connection of the turbo duct within an engine assembly. The anti-crush ring is situated on an outside surface of the turbo duct so as to form an intermediate anti-crush structure between the contact surfaces of the turbo duct and the cuff attached thereto. Also provided is a process for manufacturing the turbo duct.

An inlet duct for an internal combustion engine includes a duct member made of a compression molded fiber material. The duct member includes a main body and end portions provided on opposite sides in an axial direction of the main body. The main body includes at least one high-compression portion and at least one low-compression portion, which is made through compression molding at a compression ratio lower than that of the at least one high-compression portion. The at least one low-compression portion extends throughout a length in the axial direction of the main body.

To provide a compact intake manifold which can easily and reliably hold the flame arrester (25) to the base member, the base member (21) having the flame arrester (25) incorporated therein has the recessed body portion (31) and the annular fitting holding portion (32) for fitting the flame arrester (25) in the axial direction. The fitting holding portion (32) includes an abutment surface (32a) and a fitting inner wall peripheral surface (32b). The flame arrester (25) includes a flame suppressing structure (26), an outer cylinder body (27) surrounding the flame suppression structure (26), and an elastic holder member (51) which covers the outer peripheral surface and both end faces of the outer cylindrical body (27). The elastic holder member (51) has an outer peripheral fitting portion (52) fitted to the fitting holding portion (32) while being held in close contact with the outer cylindrical body (27).

An engine component includes an intake manifold of stratified layers defining a plurality of runners each having a gas outlet leading to a cylinder head, and a plenum including partial walls that form channels radiating from a common gas inlet and transitioning into the runners such that there is no seal between the plenum and runners. The partial walls form endoskeletal structure configured to support the intake manifold.

An intake duct for an internal combustion engine includes a plastic molded first split body and a fibrous molded second split body. The first split body includes a first flange. The second split body includes a body and a second flange that protrudes from the body. The first flange and the second flange are joined to each other through welding so that the intake duct includes a tubular shape. The second flange includes a joint joined to the first flange. The joint includes a low-compression portion formed at a lower compressibility than the body of the second split body.

An intake passage structure for an engine includes an intake port in a cylinder head of the engine, and connected to a combustion chamber to define an intake passage. The intake passage structure further includes a heat insulating member disposed along an inner surface of the intake port, and including a bulge having an upstream end surface which is a portion of an upstream end surface of the heat insulating member, the bulge has a radially outwardly protruding radially outer surface and has an increased wall thickness. The wall thickness of the bulge increases from downstream to upstream of the intake port. The upstream end surface of the bulge includes an injection machine connecting portion facing an injection gate configured to inject resin for forming the heat insulating member into the intake port.

An intake duct for an internal combustion engine includes a pipe-shaped shell. The shell includes a first molded product and a second molded product. The first molded product is formed by a plastic molded product and includes an opening extending through the first molded product in the thickness direction. The second molded product is formed by a fiber molded product produced through compression molding. The second molded product includes an air-permeable fitting projection fitted into the opening, and the second molded product is joined with an outer surface of the first molded product.

Blow molded plastic components are disclosed having integrally formed brackets, formed together with the component in the molding step. A method of blow molding is disclosed for integrally forming brackets onto a blow molded component. More specifically, the disclosures relates to a blow molded plastic component having a bracket formed integrally in the blow molding process and configured to rotate onto and lockably engage undercut features or lugs formed integrally on the outer surface of the blow molded component, all features formed during the molding process.