A manifold assembly includes a clevis-style mounting structure, a first manifold section, a second manifold section, an accessory disposed between the first and second manifold sections, and a plurality of threaded clevis fasteners. The clevis-style mounting structure includes an upper clevis structure and a lower threaded clevis structure. The clevis-style mounting structure may be operatively configured to be mounted on a cylinder head. The first manifold section has distal and proximal ends. The first manifold section is integral to the clevis style mounting structure. The plurality of threaded clevis fasteners operatively configured to mount the clevis-style mounting structure to a cylinder head via a plurality of corresponding passageways defined in the cylinder head.

An assembly for an internal combustion engine may include an intake module of a fresh air system for supplying fresh air to at least one combustion chamber of the internal combustion engine and an attachment part attached to the intake module in a joining direction. The intake module may include at least one retaining surface facing away from the attachment part. The attachment part may include at least one counter retaining surface facing away from the intake module. At least one reinforcing element may be disposed between the intake module and the attachment part and may interact with the at least one retaining surface and the at least one counter retaining surface. The at least one retaining element may be moveable in a movement direction extending transverse to the joining direction between a releasing position and a securing position.

A suction tube of a stratified scavenging engine that can improve the flexibility in designing the shapes and layouts of an air-fuel mixture passage and an air passage; allow for continuous and smooth changes in the shapes of the cross sections of the air-fuel mixture passage and the air passage from the inlet side toward the outlet side; reduce the number of components; and facilitate attachment and assembly; and that is also advantageous in terms of cost is provided. The suction tube includes an air-fuel mixture passage and an air passage, inlet and outlet sides of the passages being connected to a carburetor and a cylinder, respectively; a cylindrical exterior member that mainly forms an outer perimeter portion of each of the air-fuel mixture passage and the air passage; and an interior member for dividing the inside of the cylindrical exterior member into the air-fuel mixture passage and the air passage. With the use of elastic deformation of the interior member or the cylindrical exterior member, the interior member is attached to and integrally formed with the inside of the cylindrical exterior member.

An engine assembly and methods of supporting components of an engine assembly. An internal combustion engine includes an intake port. A charge air cooler is coupled to the intake port. A turbocharger including a charge air output port is fluidly coupled to the charge air cooler. A charge air tube is coupled to the charge air output port of the turbocharger. The charge air tube fluidly couples the turbocharger to the charge air cooler for transfer of compressed charge air from the turbocharger to the intake port of the internal combustion engine. A charge air tube support assembly is coupled to the charge air tube. The charge air tube support assembly is configured to allow axial displacement of the charge air tube along an axis of the charge air tube extending from the output port of the turbocharger to the charge air cooler in response to thermal expansion of the charge air tube. The charge air tube support assembly comprises a wear sleeve and a clamp.

Vehicle engine systems and inserts for such systems are presented. The insert can be positioned between an air intake system and a cylinder bank of an engine. In some arrangements, the insert can be positioned such that a first abutment surface directly contacts portions of a surge tank and a second abutment surface directly contacts portions of a cylinder head cover. The insert can be constructed, positioned, and/or oriented to absorb or transfer forces acting upon the engine system during impacts. For instance, the insert can be arranged such that it extends between the surge tank and the cylinder head cover along an axis that is substantially parallel to a predetermined force direction of a predetermined impact force.

A support structure for an intake manifold that reduces a burden of support on a front side of the intake manifold. The support structure includes a cylinder head and a fixing structure, and supports the intake manifold. An axial length direction of a crankshaft center is defined as a left-right direction, a horizontal direction orthogonal to the left-right direction is defined as a front-rear direction, and one side in the front-rear direction is defined as a front side. The intake manifold includes a collector and a plurality of branch pipes led out to the front side from the collector. An intake outlet at a front end of each of the branch pipes is supported by the cylinder head. The collector is elastically supported by the fixing structure. A throttle body is attached to a left or right end of the collector.

An air intake duct of a motorcycle extends rearwardly from a front portion of a motorcycle body so as to pass laterally of the left side of a motorcycle frame structure, and incoming wind is supplied as an intake air through the air intake duct to a combustion engine. The air intake duct is divided in a widthwise direction of the motorcycle. An upper dividing face of the air intake duct is disposed inward of an intermediate position, in a motorcycle widthwise direction, of the air intake duct.

An engine includes a cylinder head having a first face defining an entrance to an intake port, and an intake manifold having a second face defining an outlet from a runner. The first and second faces mate to fluidly connect the entrance and the outlet, and an area mismatch or offset exists between the entrance and the outlet. A tongue is positioned into the intake port to extend over a floor of the intake port and has an area substantially equal to a difference between the entrance area and the outlet area. The tongue maintains in-charge motion and mixing of intake gases in-cylinder in the engine.

A seal assembly includes an outer member and an annular seal. The outer member includes an outer wall and a landing. The outer wall has a cylindrically shaped inner surface disposed about an axis and configured to oppose an outer cylindrical surface of a port. The landing extends radially inward from the inner surface of the outer wall. The annular seal member is disposed about the axis and has an inner cylindrical surface, a bottom axial surface, an outer cylindrical surface, and a circumferential groove. The inner cylindrical surface of the seal member is configured seal with the outer cylindrical surface of the port. The circumferential groove is open at the outer cylindrical surface of the seal member and extends radially inward. The landing extends into the circumferential groove and is in sealing contact with the circumferential groove.

An air intake assembly configured to direct air into a throttle body of an engine of an automotive vehicle includes an air cleaner enclosure, primary and secondary air intake ducts and a downstream air intake duct. In a first operating condition, inlet air is directed into the air cleaner enclosure unit from the secondary air intake duct and routed (i) through the downstream air intake duct and into the throttle body and (ii) through the primary air intake duct and out of a primary air inlet. In a second operating condition, inlet air is directed into the air cleaner enclosure unit from the primary air intake duct and routed (iii) through the downstream air intake duct and into the throttle body and (iv) through the secondary air intake duct and out of the secondary air inlet. A method of directing the intake air into the throttle body is also provided.