HMS Performance Ceramic Coating
Exhaust manifolds can either be a cast iron, factory-type manifold or a tube steel header typically
used in performance applications, though these are becoming very common in OEM applications.
There are a numerous reasons for ceramic coating an exhaust manifold header. #1 Corrosion
protection. The manifold will have a longer lifespan as a nicer look. Whether it is for performance
or show, coating an exhaust manifold is a valuable asset. #2 The coating is a thermal barrier,
thus keeping the heat within the manifold or header. There are a number of benefits for this
contained heat. First, by keeping the heat within the manifold, you're going to accelerate the
exhaust gas velocity which reduces back pressure and reduces fuel contamination due to reversion.
This is a performance benefit. Second, you'll reduce the surface temperature of the manifold so
if a person is to come into contact with it, they are less likely to be burned and leave smoking skin
behind. If there is a component close to it, it will not see as much heat as it would with an uncoated
manifold. In addition, not as much heat will be radiated under the hood or into the engine compartment.
This reduces the under-hood temperature which, again, reduces the temperature of surrounding parts,
such as, alternators and starters. It also reduces the amount of heat that can be drawn in through the
carburetor, which is a secondary performance benefit. There are a variety of coatings that can be
used on exhaust manifolds or headers. Ceramic coatings offer protection from 1300 to over 2000
degrees.
