Nitrided Steel Piston Rings For Engines Of High Specific Power PDF Download

Several designs of nitrided-steel piston rings were performance-tested under variable conditions of output. The necessity of good surface finish and conformity of the ring to the bore was indicated in the first tests. Nitrided-steel rings of the same dimensions as cast-iron rings operating on the original piston were not satisfactory. The final design was a lighter, rectangular, thin face-width ring used on a piston having a maximum cross-head area and the proper skirt shape. Results were obtained from tests of single-cylinder and multicylinder engines.