Director plate having smooth exits

摘要

A director plate for a fuel injector for use in an internal combustion engine. A plurality of fuel passages extend through the plate between an inlet surface and an exit surface. The passage and exit surfaces are extremely smooth, having an average surface roughness (R_a) less than about 0.2 mum, and preferably less than about 0.1 mum. The corners of the exits are sharp and are free of features such as break-edges, burrs, and remelt. The surface quality may be obtained via any means of surface finishing.