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The advantages and disadvantages for the current oil consumption measurement systems, including the real-time oil consumption measurement and traditional weight methods, are reviewed. Based on the review, the Smart Oil Consumption Measuring System developed by Cummins Engine Co. in an effort to resolve some of the disadvantages of the systems developed earlier, especially compared to the Gravity Fed oil consumption measurement system, will be discussed. In addition, the uncertainty analysis of the Smart Oil Consumption Measuring System will also be briefly discussed here. The Smart Oil Consumption Measuring System has proven to be an effective tool to measure the oil consumption at almost any engine test conditions, including the steady and cyclic tests in a shorter time than most of traditional oil consumption measurement systems.

Piston ring pack performance is very critical to diesel engine blow-by and oil consumption. As structural analysis tools such as Finite Element Analysis and Boundary Element Analysis can be used to ensure the piston structural integrity, cylinder kit dynamics models are being used to predict power cylinder system performance. In this paper, detail comparisons of engine test measurements and model predictions under various operating conditions and with different ring pack configurations are presented. The cylinder kit model used for this paper is one out of six different models that were evaluated.

Inter-ring gas pressure and piston ring motion are considered important for the control of oil consumption, particulate emissions, and reduced friction. For this reason, inter-ring gas pressure was measured on a diesel engine. Two different ring pack configurations were tested (positive and negative twist second rings). A significant difference in measured inter-ring pressure was observed. The measurements were compared to the predictions of a cylinder kit model with favorable results. Predictions showed that the observed difference between measured inter-ring pressures is caused by a significant difference in ring motion. The reasons for these differences are explained in this paper.

A systematic study of the effects of atmospheric composition and gravity level upon the ignition and propagation of flame has been conducted to provide a better understanding of the phenomena of flammability. The principal purpose of this study was not to evaluate materials but to fill in gaps where information was required to help determine the relative effects of atmosphere composition, pressure level, ventilation rate, and gravity level on flame propagation rate and ignition phenomena. Common materials were selected to determine the effects of atmosphere and gravity on burning phenomena. This paper reports procedures and methods applied during the study, and presents the data obtained.