Patent ID: 6691662
Filing Date: 2004-02-17
Classification: F02M

Abstract:
An air intake manifold for an internal combustion engine, the manifold being of the type comprising an upstream plenum, common to all the downstream air ducts feeding the combustion chambers of the engine and supplied with air through an air inlet orifice connected to a device for controlling the intake of air to the engine, such as a throttle body, mounted upstream of said inlet orifice, and, for each combustion chamber of the engine, at least one of the downstream air ducts connecting a respective outlet orifice of the plenum to a corresponding supply orifice of said combustion chamber of the engine, said supply orifice being formed in at least one flange that fixes the manifold to a cylinder head of said engine, the plenum and each of the air ducts at least being made of synthetic material, wherein for each combustion chamber of the engine, at least one corresponding downstream air duct has at least one sudden enlargement of its passage cross section, followed immediately in the downstream direction by a duct portion having a progressive reduction in cross section in the downstream direction, ending upstream of said fixing flange.