Factors Controlling the Performance of Pistons and Piston-Rings 350115

THIS paper points out how the problems of decreasing oil-consumption and blow-by and preventing piston-slap are affected by different piston and piston-ring characteristics, and some of the things that can be done toward solving them.
Improvements made in pistons-as to design, materials and construction-are cited. Problems concerning oil-control are stated, and means for solving them are set forth.
Interesting figures on piston-ring-wear tests are presented and the conclusion regarding them is that the wear of pistons, piston-rings and cylinders, is due almost entirely to factors which, though usually present, are outside influences.
These include abrasive material entering with the intake air, crankcase sludge, excessive choking, cold starting, and blow-by.
Wear inside the cylinders cannot be eliminated without the use of improved air-filters and oil-filters, and by improved cold-starting conditions.


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