Tumble type hollow mold bent intake pipe for raw cylinder head of spark ignition engine, has lower surface provided on part of its length and connected to housing of seat by transition zone to form return in mass of head of heat engine

摘要

The pipe (1) has a flat lower surface (6a) provided on a part of its length and connected to an annular housing (4) of a valve seat by a round transition zone (7b) to form a round shaped return (7a) in the mass of a raw cylinder head (2) of a heat engine i.e. spark ignition engine. The return is formed at the base of the surface and is symmetric with respect to a symmetric plane of the cylinder head. The return is disengaged by an ogive (8). An independent claim is also included for a method of manufacturing a cylinder head of a heat engine.