Cylinder sleeve for two-cycle engine

摘要

A cylinder liner and method for forming it for a reciprocating machine including a sleeve having one or more port openings that have stepped diameters so as to form a shoulder. The shoulder lies approximately at the finished outer diameter of the sleeve and a resist or stop layer is positioned on the larger diameter portion of the port opening and the sleeve is plated so that the plating layer will extend only over the inner surface, first portion of the port opening and the shoulder. As a result, removal of the outer sleeve periphery will not upset the plating layer nor will it leave edges of the plating layer exposed to flow through the port as might cause erosion.