Abstract: An intake system in a multi-cylinder type internal combustion engine comprises throttle valves disposed in a plurality of intake passages commonly connected to an air cleaner, and fuel injection valves disposed in the intake passages downstream of the throttle valves in an intake direction. In such intake system, a plurality of funnel-shaped portions are provided in a throttle body having opposite ends directly coupled to an intake manifold and an air cleaner, respectively, and each of the throttle valves is disposed in the throttle body, so that its upstream end in the intake direction is located at least on the corresponding funnel-shaped portion, when the throttle valve is fully opened. The throttle body includes ports provided therein, which are opened into the intake passages between a coupled surface of the throttle body to the intake manifold and the throttle valves, respectively, and which communicate with one another.

Abstract: An intake manifold system for a V-type multiple cylinder engine comprising an upstream intake passage, a plenum intake chamber, an intake manifold and downstream intake passages. The upstream intake passage which is directly connected to a throttle body curves downwards towards the intake chamber while the downstream intake passages are connected to the upper end of the intake chamber by way of the intake manifold and after being curved in the shape of inverted letter U are connected to the intake ports of the engine. The intake manifold system as a whole can be accommodated within a gap defined between the two cylinder banks of the engine in a highly compact manner. The advantageous arrangement of the overall intake passage produces favorable ram effect and assures high volume efficiency particularly in low speed range of the engine.