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

An air intake passage (30) has a third passage (37) that connects an intercooler (36) and a bottom portion of a surge tank (38) such that the intercooler (36) is positioned below the surge tank (38). A pair of wall portions (71, 72) configured to catch moisture is formed in a section from an upstream end portion of the third passage (37) to a connected portion between said third passage (37) and the surge tank (38).

An internal combustion engine (10) fitted with a carburetor (40) is provided with a fire-resistant cover member (62) having a front wall (65A) facing an air inlet port (44) of the carburetor, and a breather tube (60) having an inlet end (60A) connected to a crank chamber (28) of the internal combustion engine main body, and an outlet end (60B) supported by the cover member at a position located between the front wall and the carburetor.

Check valves have a housing defining an internal cavity and a first port and a second port both in fluid communication with the internal cavity and have a hemispherical poppet sealing member within the internal cavity and translatable between a closed position against an annular seat within the internal cavity of the housing and an open position. The annular seat, in a longitudinal cross-section through the check valve, defines a convex spherical radius and, in the closed position, a convex surface of the hemispherical poppet sealing member is sealing engaged with the convex spherical radius of the annular seat.

Embodiments of apparatus for controlling the movement of matter, including but not limited to one-way fluid valves, are disclosed. The apparatus may include a transition nozzle, a funnel nozzle, and a reverse flow blocker arranged in series in a case. A counter-flow area may be disposed about the funnel nozzle. The apparatus may permit matter to flow in a first direction, and discourage or prevent flow in a direction reverse to the first direction. Control over the flow of matter also may enable matter to be harvested, sorted, separated or combined with injected matter.

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.

Embodiments of apparatus for controlling the movement of matter, including but not limited to one-way fluid valves, are disclosed. The apparatus may include a transition nozzle, a funnel nozzle, and a reverse flow blocker arranged in series in a case. A counter-flow area may be disposed about the funnel nozzle. The apparatus may permit matter to flow in a first direction, and discourage or prevent flow in a direction reverse to the first direction. Control over the flow of matter may also enable the matter to be harvested, sorted, separated or combined with injected matter.

A backflow preventer, including one or multiple reducing rings that are disposed in a pipeline, the outer edges of the reducing rings are connected to the inner wall of the pipeline; the multiple reducing rings are arranged along the axis of the pipeline, and the actual internal area of the reducing rings are gradually decreased in the axial direction of the reducing rings. Further disclosed is an engine EGR system including the backflow preventer. The backflow preventer can generate, according to different flowing directions in a pipeline, throttling losses of different degrees, when an air flows in a direction (forward direction) in which the actual internal area of the reducing rings decreases, the throttling loss is small; and when then air flows in a direction (reverse direction) in which the actual internal area of the reducing rings increases, the throttling loss is large.

An internal combustion engine has two cylinder banks, an electrical compressor, and at least one turbocharger, in which a first shut-off valve, which is arranged in the line leading from an e-compressor outlet to air-collecting devices of the cylinder banks, can at least release and block a throughflow through the line. A method operates the internal combustion engine, by which the internal combustion chamber is operated symmetrically or asymmetrically, depending on the engine speed.