Intake system in multi-cylinder type internal combustion engine

An intake system in a multi-cylinder type internal combustion engine according to claim further including communication passages with which said ports commonly communicate, said communication passages being disposed above said ports.

An intake system in a multi-cylinder type internal combustion engine, comprising a plurality of intake passages independently leading to cylinders in an engine body and commonly connected to an air cleaner, throttle valves independently disposed in the intake passages, and fuel injection valves independently disposed in the intake passages at positions downstream of the throttle valves in an intake direction in correspondence to the cylinders, wherein

• each of said intake passages comprises an intake manifold connected to the engine body and a throttle body having opposite ends directly connected to the intake manifold and the air cleaner, respectively, said throttle body including constrictions provided therein and opened into the intake passages between a coupled surface of the throttle body to the intake manifold and the throttle valves, respectively, said constrictions being commonly connected to an intake pressure detector.

An intake system in a multi-cylinder type internal combustion engine, comprising a plurality of intake passages independently leading to cylinders in an engine body and commonly connected to an air cleaner, throttle valves independently disposed in the intake passages and fuel injection valves also independently disposed in the intake passages at positions downstream of the throttle valves in an intake direction in correspondence to the cylinders, wherein

• each of said intake passages comprises an intake manifold connected to the engine body and a throttle body having opposite ends directly connected to the intake manifold and the air cleaner, respectively, said throttle body including first and second ports provided therein and opposed to each other in a plane in the intake direction, including rotational axes of the throttle valves, so that they are opened into the intake passages between a coupled surface of the throttle body to the intake manifold and the throttle valves, and
• said intake system further includes a first communication passage commonly communicating with the first ports, and a second communication passage commonly communicating with the second port, said first and second communication passages being disposed above said first and second ports, respectively.