Patent ID: 8726881

Claim:
An inlet passage structure of a V-type internal combustion engine in a vehicle body, the engine having a pair of front and rear banks disposed in a shape of V, with a cylinder center line CA of in a front-to-back direction of the vehicle body being offset in a right direction of the vehicle body, and a cylinder center line CB of the rear bank in the front-to-back direction of the vehicle body being offset in a left direction of the vehicle body, an inlet chamber downstream of a throttle body commonly shared by the front and rear banks, and an inlet pipe branched from the inlet chamber to a combustion chamber of each of the front and rear banks, the inlet passage structure comprising: an inlet port provided to each of the front and rear banks and having a nearly identical inlet passage length, wherein the inlet chamber is connected to a top end opening of the inlet port; the throttle body includes two inlet paths, the throttle body and the inlet chamber are offset on a side leading to a cylinder on a side away from the throttle body, the throttle body being arranged being offset so that the two inlet paths have identical lengths; and an inside of the inlet chamber is formed with a nearly straight inlet passage from the throttle body to the top end opening of the inlet port leading to the cylinder on the side away from the throttle body and a curved inlet passage to the top end opening of the inlet port leading to a cylinder on a close side.