Abstract: A casting core for an intake pipe assembly for an in-line four to six cylinder internal combustion engine. Core parts for each two similar individual intake pipes form, together with the core parts for the intermediate part of the intake manifold, an integral core segment. The core segments are permanently connected to one another in a vicinity of their core parts for the intake manifold.

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.

Abstract: The invention provides an air induction system or manifold for a multi-cylinder internal combustion engine, which is arranged in two parts, the first having portions of the induction passages for each cylinder formed therein, and the second attached to the first to form a housing therewith in communication with each of the induction passages, at least the first part being arranged so that it may be pressure die cast in manufacture.

Abstract: The invention provides an air induction system or manifold for a multi-cylinder internal combustion engine, which is arranged in two parts, the first having portions of the induction passages for each cylinder formed therein, and the second attached to the first to form a housing therewith in communication with each of the induction passages, at least the first part being arranged so that it may be pressure die cast in manufacture.