Intake-pipe arrangement for in-line internal combustion engines

Abstract

An intake-pipe assembly is provided for use with internal combustion engines of the type including four to six cylinders arranged in line. The intake assembly includes an intake manifold and a plurality of intake pipes opening into respective opposite sides of the intake manifold and extending to engine inlet channel means. The intake pipes are configured so as to have substantially equal lengths and so as to extend from openings at one plane at the manifold to openings at the engine inlet channel means in a plane at right angles to the manifold connection plane. In order to optimize the utilization of space while also optimizing and maximizing the radius of curvature of the intake pipes, the pipes are arranged with intermediate curved segments which overlap one another and extend in respective planes which intersect with one another in the vicinity of a common intersection area for the intermediate curved segments and connecting end portions leading therefrom to the engine inlet channel.