since the use of aluminium cylinder heads was introduced, the importance of valve seat inserts has increased dramatically. Together with the valves, they serve to seal off the combustion chamber of the cylinder head. The valve seat insert prevents the valve from knocking/ digging into the cylinder head. It absorbs part of the combustion heat that is transferred to the valve.
the valve seat insert passes this heat on to the cylinder head. In order to respond to the different conditions to which a valve seat is subjected, the best combination of materials for its production must be found. Not only the operating conditions in the engine have to be taken into account, but the ability of the engine reconditioner to work with the material as well.
valve seat inserts
valve seat inserts made of sintered material (powder metallurgy process) are used in the latest generations of engines produced by well known automotive manufacturers. The increasing extreme thermal and mechancial strain placed on the valve seat inserts in the combustion chamber can scarcely be accommodated by materials manufactured by the conventional casting process. For this reason msi offers sintered valve seat inserts, among other items, made of two different combinations of material to cover the entire range of uses for the engines of the future.