An internal combustion engine may include at least one engine block having a plurality of cylinders and at least one flange component. At least one attachment part may be secured to the at least one flange component. An alignment device may be constructed and arranged to align the at least one attachment part relative to the at least one flange component when the at least one attachment part is attached to the at least one flange component. The alignment device may include at least a first alignment unit, a second alignment unit, and a third alignment unit, which may be spaced apart from one another. At least one of the first alignment unit, the second alignment unit, and the third alignment unit may be constructed and arranged to align the at least one attachment part to a cylinder head in relation to a first aligning direction perpendicular to an attaching direction, when the at least one attachment part is attached to the cylinder head. At least one of the first alignment unit, the second alignment unit, and the third alignment unit may be constructed and arranged to align the at least one attachment part to the cylinder head in relation to a second aligning direction perpendicular to the attaching direction and inclined to the first aligning direction. The at least first alignment unit, the second alignment unit, and the third alignment unit may each be constructed and arranged to align the at least one attachment part to the cylinder head exclusively in one of the first aligning direction or the second aligning direction.

An assembling structure for an intake manifold includes: a first downstream portion; a second downstream portion; an upstream portion; a connecting member that connects the first downstream portion and the second downstream portion with each other; and a plate-shaped stay. The connecting member is fixed to the first downstream portion and the second downstream portion by a bolt, and an other member that is a member other than the intake manifold is fixed to the intake manifold through the stay at least either between the connecting member and the first downstream portion, or between the connecting member and the second downstream portion.

A fluid mixing device that includes a housing having a fuel inlet and at least one primary orifice positioned at the inlet, wherein the at least one orifice configured to disperse a stream of fuel into a plurality of fuel droplets. The plurality of fuel droplets contact a fuel impingement surface to break up the plurality of fuel droplets into a plurality of smaller secondary droplets and create a thin film of secondary droplets on the impingement surface. At least one pressurized air channel delivers an airflow into contact with the secondary droplets. The secondary droplets pass through a plurality of secondary outlet orifices to exit the housing. A size of the plurality of secondary droplets is reduced when passing out of the plurality of secondary orifices.

Vehicle engine systems and protectors for such systems are presented. Vehicle engine systems can include one or more engine components associated with an engine. In some embodiments a protector can be attached to an engine system to substantially cover a portion of one or more engine components. The protector can have a shield and a support. In some arrangements, the shield can be operatively connected to two cylinder banks of an engine. The shield can extend over and substantially cover a portion of a fuel line and/or a fuel line connector. In one or more embodiments, the support can include a support end configured to support a vehicle component such as a throttle body.

A straddled vehicle includes a duct part formed integrally with a lower case of an air cleaner and extending forward from the lower case in a vehicle front-rear direction, and a side cover including a duct formation portion placed outward of the duct part in a vehicle width direction. At least a portion of the side cover is assembled onto the duct part. A duct is defined by the duct part and the duct formation portion of the side cover.

A fresh air supply system may include a housing that may include an upper housing part and a lower housing part and delimiting a housing interior. The system may also include at least one bearing part arranged in the housing interior and a shaft at least partially arranged and rotatably mounted in the at least one bearing part. The at least one bearing part, in a cross-section of the housing perpendicular to a rotation axis of the shaft, may be structured in a pot-like manner including a pot base. The lower housing part may include a lower housing part extension resting against a projection of the pot base such that a clamping connection is formable. The upper housing part may include at least one upper housing part extension which the at least one bearing part may rest against.

A fuel atomizer that includes a housing having a fuel inlet and at least one primary orifice positioned at the inlet, wherein the at least one orifice configured to disperse a stream of fuel into a plurality of fuel droplets. The plurality of fuel droplets contact a fuel impingement surface to break up the plurality of fuel droplets into a plurality of smaller secondary droplets and create a thin film of secondary droplets on the impingement surface. At least one pressurized air channel delivers an airflow into contact with the secondary droplets. The secondary droplets pass through a plurality of secondary outlet orifices to exit the housing. A size of the plurality of secondary droplets is reduced when passing out of the plurality of secondary orifices.

An air intake device for an internal combustion engine of the present invention includes a water discharge passage extending from a bottom surface of a control valve housing part recessed in a housing passage forming part of an air intake passage to an air intake port. The water discharge passage is formed independently from the air intake passage, and includes: a water collection groove recessed in the bottom surface; a water discharge hole formed penetrating a cover of a valve control housing; and a water discharge hole penetrating a flange part of an insert inserted into the air intake port. The downstream end of the water discharge hole is connected to a space defined between an air intake port inner wall surface and an insert cylindrical part.

A work vehicle includes an engine, an intake passage through which combustion air flows from an ambient air inlet to an engine, an air cleaner for removing dust contained in the combustion air, a throttle valve for adjusting an intake amount of the combustion air by the engine, a blowby gas returning passage for returning blowby gas discharged from the engine to a mid portion of the intake passage, and an inclined passage portion that assumes a progressively downwardly inclined posture to be located at a lower position on downstream side in a flow direction, the inclined passage portion having a water draining portion at its lowermost end.

A throttle body adapter connects a throttle body and an air intake manifold spaced from the throttle body in a marine engine. The throttle body adapter has an air passage having an inlet and an outlet of different shapes. The throttle body adapter has threaded openings which allow a fuse box, an electronic control module, a hose fitting and a mounting bracket for a beauty cover to be mounted to the throttle body adapter with threaded fasteners. The throttle body adapter further comprises a threaded opening adapted to receive an air inlet temperature sensor.