INTAKE MANIFOLD OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To improve engine performance by making the cylinder head and surrounding portions compact, while equalizing the swirl between cylinders. SOLUTION: A hanging width W of a manifold passage 3 from a cylinder head end face 1a is made narrower to the extent that, at least, flaking off of the main current of suction air occurs. As a result, the cylinder head and surrounding portions can be made compact. In addition, an air inlet angle adjustment projection 40 that decreases an air inlet angleθ3 of the suction air main current relative to the normal of the surface of a furthermost inlet port 23 is provided near the furthermost suction air outlet 33 so that the swirl ratio of a cylinder 13 corresponding to the furthermost inlet port 23 becomes the same extent as that of another cylinder 11. As a result, the equalization of the swirl ratio between cylinders is achieved.