An air intake port (10) for a lean-burn gasoline engine (110) comprises an air inlet (14), two air outlets (15a, 15b), and an air channel connecting the air inlet (14) to the two air outlets (15a, 15b) and comprising an upstream common duct (11) and two downstream port legs (12a, 12b), the two downstream port legs (12a, 12b) branching off from the common duct (11) at a bifurcation point (13). A total cross section of the air intake port (10) gradually decreases between the air inlet (14) and the two air outlets (15a, 15b). A gradient of decrease of the total cross section is locally reduced in a region adjacent the bifurcation point (13).

An improved internal combustion engine air intake system that operates in tandem with the original equipment air intake system and does not endanger the vehicle warranty and provides improved airflow to the engine which improves engine performance and efficiency. The improved internal combustion engine air intake system also provides one or more additional air inputs taken from a different location than the original equipment air intake which improves the likelihood of providing additional cooler, denser, air to the engine air intake which will improve engine efficiency.

A dual compressor turbocharger includes two compressors. One compressor supplies fuel pressure, and one compressor supplies air pressure. The dual compressor turbocharger includes a turbine driven by exhaust of an engine and a shaft coupled to the turbine. The first compressor is mounted on the shaft and includes a first inlet coupled to an air supply and a first outlet coupled to an air intake of the engine. The second compressor is mounted on the shaft and includes a second inlet coupled to a fuel supply and a second outlet coupled to a fuel supply rail of the engine.

A partition plate is configured to separate an intake passage formed by an intake pipe to be coupled to a combustion chamber into a first intake passage and a second intake passage. The first intake passage is openable and closable by a valve. A shape of a first cross section orthogonal to an extending direction of the intake pipe is set on the basis of a shape of a surface of the intake pipe that faces the partition plate with the second intake passage interposed therebetween.

The present disclosure provides air intake ports and/or intake manifolds having an altered configuration to improve the efficiency of the air intake ports, intake manifolds, and by extension, the engine.

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 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 forming channels radiating from a common gas inlet extending into a gooseneck conduit having an incorporated throttle body. The gooseneck conduit transitions into the channels and runners such that there is no seal between the gooseneck, plenum, and runners.

An engine air intake duct includes a duct wall and an orifice cap. The duct wall extends between an air inlet and an air outlet and has at least one orifice disposed therethrough. The duct wall has an integrally-formed closure mechanism adjacent the orifice. The orifice cap is moveable relative to and securable to the closure mechanism to substantially cover the orifice.

To provide an engine device with high reliability and high safety in which a pipe conduit in a portion where a blow-by gas having leaked from a combustion chamber is merged with intake air (outdoor air) is not blocked with ice coating even in use in a cold region, especially an arctic region at 20 C. or less, a blow-by gas mixed joint configured to introduce a blow-by gas flowing in a returning hose to an intake pipe includes a blow-by gas guide plate that defines introduction space expanding upstream and downstream of a blow-by gas inlet in an intake direction of an intake passage. The blow-by gas guide plate closes an upstream end of a part of the introduction space expanding upstream of a blow-by gas inlet and opens a downstream end of a part of the introduction space expanding downward of the blow-by gas inlet in the intake passage.

A motorcycle intake air guide for guiding an intake air volumetric flow from a front region of a motorcycle to a motorcycle internal combustion engine includes a front air guiding duct, a rear air guiding duct arranged downstream of the front air guiding duct, and a steering head bypass region arranged between and connecting the front and the rear air guiding ducts to one another. The front and the rear air guiding ducts have a closed profile. The steering head bypass region preferably has, in a steering head cross-sectional plane which is arranged orthogonally with respect to a main flow direction of the intake air volumetric flow in the steering head bypass region, a non-closed profile for guiding the intake air volumetric flow around a steering head recess through which a steering head of the motorcycle extends. The steering head may close the non-closed profile at the steering head recess.