Improving the efficiency and reducing the exhaust gas emission have been the goals in the research of internal combustion engines. This thesis presents the fundamental theory in computational modeling of lubrication, piston ring wear and oil consumption in an engine, which play significant roles in influencing the efficiency and emission of the engine. This thesis also presents the predicted results of a study in which the relationship between the piston ring wear and the oil consumption of a 4.6L, V8 engine was analyzed. A computer program, the CASE system (Cylinder kit Analysis System for Engines), together with WEAR and OILCONSUME models were used to simulate the results for this thesis.; The predicted results show that the engine load and speed affected the piston ring wear and the oil consumption significantly. The transient analysis of the piston ring wear show that the piston ring surface experienced high volume loss due to wear during the first 20 hours simulation and reached steady state value after that time period. The transient results of the oil consumption, which consists of oil vaporization and reverse flow through the upper ring gap, did not show significant variation during the 500 hours simulation. However, blow-by into the crankcase showed a significant increase during the 500 hours simulation under the effect of wear.
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