VALVE SEAT FOR ENGINE, METHOD OF MANUFACTURING THE VALVE SEAT, AND CYLINDER HEAD FOR ENGINE

摘要

A valve seat for an engine capable of solving a problem with a conventional one wherein since an engine fuel formed mainly of alcohol may contain a rather large quantity of water as compared with conventional gasoline and light oil, there is the possibility of entry of water content in a clearance between an intake valve seat and the fitted receiving part of a cylinder head to which the valve seat is fitted when the engine fuel formed mainly of alcohol is led, together with air, into a cylinder through an intake port having the intake valve seat. A plating layer (14) is formed on the surface of a ferrous valve seat body (17) fitted to the fitted receiving part (13) formed in the intake port (6) of the aluminum alloy cylinder head (2). Since the plating layer (14) is provided between the cylinder head (2) and the valve seat body (17), galvanic corrosion can be prevented by reducing, through water, a potential difference between dissimilar metals, i.e., between the fitted receiving part (13) and the valve seat body (17).