Second Paper: Comparison between Measured and Calculated Thicknesses of the Oil-Film Lubricating Piston Rings

This is the authors' abstract. We don't add key points for this paper.

An iterative method of solving the hydrodynamic equations of lubrication of a piston ring is described. Some results of the calculations are compared with the measured values of the oil-film thickness in an actual engine. It is shown that there are disagreements of up to a factor of 8 between the theoretical and measured values. Further experiments were carried out on a single ring in a motored rig and here it was shown that although the film thickness is considerably greater, it is still not in complete agreement with the theory.