An intake structure of the present invention is applied to a multi-cylinder engine including an electrically controlled throttle integrally including a throttle valve configured to adjust an amount of air to be supplied to the engine and an electronic control unit configured to control the throttle valve. The engine intake structure includes: an air cleaner configured to purify the air; and an intake manifold configured to distribute the air purified by the air cleaner to an intake port of each cylinder of the multi-cylinder engine. The electrically controlled throttle is attached to the intake manifold such that the electronic control unit is separated outward in a radial direction of an engine rotation shaft.

An outboard motor (10) includes a V-engine (20) having a left bank (BL) and a right bank (BR) extending obliquely toward a rear left side and a rear right side, respectively, relative to a crankshaft (21) extending in a vertical direction. An intake device (18) is provided between the left bank and the right bank, and catalyst devices (62L, 62R) that treat exhaust gas are disposed rearward of cylinder heads (24L, 24R) of the left bank and the right bank.

An outboard motor (10) includes a V-engine (20) having a left bank (BL) and a right bank (BR) extending obliquely toward a rear left side and a rear right side, respectively, relative to a crankshaft (21) extending in a vertical direction. An intake device (18) is provided between the left bank and the right bank, and catalyst devices (62L, 62R) that treat exhaust gas are disposed rearward of cylinder heads (24L, 24R) of the left bank and the right bank.

Piston engine updraft and downdraft air intake systems, having a heat exchanger core and first and second intercooler flange structures having the same pattern of bolt apertures. The updraft air intake system has an air inlet component with an air inlet flange bolted to and having the same pattern of bolt apertures as the first intercooler flange structure, with the assembly configured to be mounted over the engine intake manifold with the air inlet component below the heat exchanger core. The downdraft air intake system has an air distribution tray with distribution channels, and an air passage closure tray that mates with the air distribution tray to form air conduits with outlet ports configured to be connected to cylinder air intake ports, and an air tray distribution flange bolted to and having the same pattern of bolt apertures as the second intercooler flange structure.

An intake system of an engine is provided. The intake system may include an intake manifold coupled to a first throttle body and a second throttle body, where the intake manifold is formed from an upper shell and a lower shell. The intake system further includes a vacuum port located in the intake manifold and in an air-flow path downstream of the first throttle body and the second throttle body and upstream of a plurality of intake runners of the intake manifold, the vacuum port including a spigot extending through the upper shell of the intake manifold, and a vacuum passage coupling the vacuum port to a vehicle subsystem.

An intake device for an internal combustion engine configures a flow passage for intake air that is drawn into combustion chambers. The intake device includes an intake manifold configuring multiple runners that respectively distribute intake air to multiple cylinders, a surge tank including a cavity that is connected to the runners and defines a convergence portion, a throttle body incorporating a throttle valve, and a connection pipe connecting the surge tank and the throttle body and configuring a curved flow passage extending between the throttle body and the surge tank. The connection pipe includes a partition plate that divides the curved flow passage into a circumferentially inner flow passage and a circumferentially outer flow passage.

A first throttle body and a second throttle body include valve rotation devices that independently drive respective throttle valves. The first throttle body and the second throttle body are arranged such that the respective valve rotation devices have states rotated around respective bore central axes to cause respective throttle valve rotation shafts to have angles with respect to straight lines parallel to a crankshaft in an engine top view.

A first throttle body and a second throttle body include valve rotation devices that independently drive respective throttle valves. The first throttle body and the second throttle body are arranged such that the respective valve rotation devices have states rotated around respective bore central axes to cause respective throttle valve rotation shafts to have angles with respect to straight lines parallel to a crankshaft in an engine top view.

An intake manifold is connected to a cylinder head, and extends backward therefrom. An injector is attached to either the cylinder head or the intake manifold. At least one of the cylinder head and the intake manifold includes a curve pipe portion shaped to curve backward from a lateral surface of the cylinder head. An injector is attached to the cylinder head at either an outer lateral surface of the curve pipe portion in a right-and-left direction of an outboard motor or a position located forward of the curve pipe potion.

An intake manifold includes a surge tank and left and right intake pipes. On a part of an outer periphery portion of the surge tank that faces a front direction or a rear direction of a vehicle, a pressure measurement portion to measure pressure in the surge tank is provided. A pressure sensor is attached to the pressure measurement portion. A sensing space containing one end side that is opened in the surge tank and the other end side in which a pressure sensing portion of the pressure sensor is disposed is formed on the pressure measurement portion. A bottom surface constituting the sensing space of the pressure measurement portion is inclined downwardly toward an opening portion to the surge tank.