These are usually thin, so have little insulatory properties however, they reduce engine bay heating by lessening the heat output via radiation. Ceramic paint is sprayed or brushed onto the manifold and then cured in an oven.There are a few types of thermal insulation but three are particularly common: This decreases the amount of heat given off into the engine bay, therefore reducing the intake manifold temperature.
Polished stainless steel will also color (usually a yellow tint), but less than chrome in most cases.Īnother form of modification used is to insulate a standard or aftermarket manifold. Chrome plated headers are available but these tend to blue after use. They may be coated with a ceramic-type finish (sometimes both inside and outside), or painted with a heat-resistant finish, or bare. The most common types of aftermarket headers are made of mild steel or stainless steel tubing for the primary tubes along with flat flanges and possibly a larger diameter collector made of a similar material as the primaries. Headers that do not have collectors are called zoomie headers.
These consist of individual exhaust headpipes for each cylinder, which then usually converge into one tube called a collector. For many engines, there are aftermarket tubular exhaust manifolds known as headers in American English, as extractor manifolds in British and Australian English, and simply as "tubular manifolds" in British English. The word manifold comes from the Old English word manigfeald (from the Anglo-Saxon manig and feald ) and refers to the folding together of multiple inputs and outputs (in contrast, an inlet or intake manifold supplies air to the cylinders).Įxhaust manifolds are generally simple cast iron or stainless steel units which collect engine exhaust gas from multiple cylinders and deliver it to the exhaust pipe. In automotive engineering, an exhaust manifold collects the exhaust gases from multiple cylinders into one pipe. Ceramic-coated exhaust manifold on the side of a performance car
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