Inertia charge intake manifold for multi-cylinder internal combustion engine

摘要

A method is provided for connecting an end (11b-14b) of a branch pipe (11-14) of an intake manifold (8) to another member (10) of the intake manifold (8), wherein the branch pipe (11-14) and said another member (10) are made of a hard thermoplastic synthetic resin. The method comprises the steps of: providing the end (11b-14b) of the branch pipe (11-14) with a flat end surface (22) which is generally perpendicular to an axis of the end (11b-14b) of the branch pipe (11-14); providing said another member (10) with a connecting surface (23) for fixing the flat end surface (22); forming a ring-shaped protrusion (24) on at least one of the flat end surface (22) and the connecting surface (23); arranging a heating wire (25) around the ring-shaped protrusion (24); causing the flat end surface (22) and the connecting surface (23) to be pressed against each other; and applying a voltage across the heating wire (25).