Engine exhaust manifold having independent flanges spaced by a rigid spacer

摘要

The engine exhaust manifold 111 comprises at least two gas transfer tubes 113a-d and a common exhaust gas outlet 116. Each tube has a respective flange 112a-d that secures the manifold to an engine, preferably a cylinder head 110B of the engine. A rigid spacer 115a-c is provided between adjacent flanges. The spacer has an interference fit when the manifold is cold, i.e. at ambient temperature, and is intended to resist thermal stresses that would otherwise distort the manifold. The flanges may include recesses specifically for receiving and retaining the spacers. A gasket 119 may be provided between the flanges and the cylinder head of the engine whereby the spacers are attached to the gasket. The engine may be an internal combustion (IC) engine of a motor vehicle, such as a car. A method of manufacture of the engine exhaust manifold is also claimed.