A system for enhancing performance of a carburetor engine and peripherals of an all-terrain vehicle.

Vehicle Engine Air Intake System and Method (to be accompanied by FIGS. 1 and 3) In a motor vehicle (12), an air filter housing (14) is at least partially defined by a cross-member (28) forming part of a structural front end module of the vehicle body. The cross-member (28) defines a recess (44) for receiving an air filter (90) and at least one air inlet aperture opening into the recess. An air filter enclosure assembly is mounted to the cross-member over an open face of the recess. The air filter enclosure assembly may include an air filter enclosure (42) and an air filter (90).

A system for enhancing performance of a carburetor engine and peripherals of an all-terrain vehicle.

A vessel propulsion apparatus includes an engine and a propulsion unit to be driven by the engine. The engine includes a cylinder head including a combustion chamber and a pair of intake openings to communicate with the combustion chamber. The engine further includes a pair of intake ports respectively including a pair of downstream portions respectively connected to the pair of intake openings. A distance between the pair of downstream portions decreases toward the pair of intake openings.

A snowmobile includes an engine including an engine head including a cylinder head, a supercharger, an intake manifold, throttle bodies, first joints that connect the intake manifold to the throttle bodies, second joints that connect the throttle bodies to the cylinder head, and a restrictor that connects the engine head to the first joints. The restrictor includes an engaging member that fits into grooves of the first joints, and connectors that connect the engaging member and the engine head to each other. A steering shaft is inserted between two mutually adjacent first joints which have a distance from each other greater than a distance between the other two mutually adjacent first joints.

An air intake system for a vehicle comprises an exterior air inlet disposed on the vehicle that receives air from an exterior of the vehicle. An air outlet is disposed on the vehicle that supplies air to an engine of the vehicle. A conduit network connects the exterior air inlet and the air outlet. An interior air device disposed on the vehicle is connected to the conduit network allowing air from an interior of the vehicle into the engine. A base plate with an opening is attached to the conduit network. A hatch connected the base plate allows air from the interior of the vehicle through the opening.

A vehicle including an air intake system for an engine component includes a vehicle frame including one or more frame components, at least one of the one or more frame components includes an engine air passage and at least one intake port in communication with the engine air passage. At least one duct port of the frame component is in communication with the engine air passage. An engine component is coupled with the vehicle frame, and an intake duct extends from the at least one duct port to the engine component.

A gasket arrangement for use between an intake manifold and a cylinder head of an internal combustion engine is provided. Individual runner grooves are formed around each of the manifold runner openings. A collective runner groove is formed around all of the individual runner grooves. A relatively compressible sealing gasket material is placed in each of the runner grooves and a barrier gasket material placed in the collective runner groove. The relatively compressible sealing gasket material provides an effective seal at low engine operating temperatures. The barrier gasket material provides an effective seal against the passage of hydrocarbons. The relatively compressible sealing gasket material is preferably silicone rubber. The barrier gasket material is preferably a fluorine elastomer having a high fluorine content of preferably at least 66.0%. Accordingly, the silicone gasket provides a seal while the fluorinated polymer gasket is relatively impermeable to hydrocarbons and satisfies emission requirements.

The invention relates to a gas distribution manifold (3) in the cylinder head of a heat engine of a motor vehicle, said manifold (3) comprising a manifold housing (31) provided with an inflow face for the inflow of an admission gas (G) and an outflow face (3B) entering the cylinder head of the engine, and an injection spout (6) for injecting a recirculated exhaust gas flow (H) of the engine into the admission gas flow (G), the manifold housing (31) and the injection spout (6) forming a single component. As the injection spout (6) comprises an open face, the manifold (3) is configured such that said open face is closed by an element outside the manifold (3), especially the cylinder head, in such a way as to form a tubular injection pipeline.

An intake swirl gasket is disclosed herein. It is installed between a cylinder head and an intake manifold and comprises plural airflow holes for respectively communicating with plural intake passages of the cylinder head; and plural diversion devices respectively disposed in the plural airflow holes and each having an axis and plural splitter blades extended from the axis for connecting to an inner wall of each of the plural airflow holes, wherein each of the plural splitter blades is shaped as an arc to form a recessed surface towards the intake manifold at one side thereof and a convex surface towards the cylinder head at the other side thereof, and wherein an included angle between each of the plural splitter blades and an end face of the intake swirl gasket oriented towards the cylinder head ranges from 50 to 80 degrees.