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The distortion of the cylinder liners of internal combustion engines has a significant affect on engine operation. It can affect the lubrication oil consumption, the blow-by, the wear behaviour and due to the friction, the fuel consumption. In order to achieve future requirements regarding exhaust emissions and fuel consumption, the requirements for low cylinder distortion engine blocks will play a significant role. Hence, a new technique to determine liner distortion during fired engine operation was developed.

Modern passenger car engines are designed to operate at increasingly higher rated engine speeds with more internal parts (multi-valve engines) requiring lubrication. There is a higher probability for the oil quality to deteriorate due to an unfavorably high level of oil aeration. The high oil aeration can cause hydraulic lash adjuster misfunction and connecting rod bearing failure. This paper presents results of recent research and development work concerning the occurence of oil aeration within the lubricant system of modern combustion engines. In particular, the work has concentrated on the following: How oil aeration affects engine operation How cavitation occurs in the supply bore to the connecting rod bearings What causes air entrainment in lubricants

Lubrication networks in today's passenger car engines are complex systems managing the interactions between the manufacturers' demand for long engine-life, low friction characteristics and sufficient heat-transfer work of the lubricant. Modern engines work harder and run hotter and consequently place more demands on the engine oil and the design of the lubrication system. The paper presents an overview of the influences of various oil pump parameters as oil pump suction port, rotor geometry and oil pump component clearances on the engine's operating behavior. The results of detailed investigations, intended to design the oil pump capacity exactly to the requirements of the optimized lubrication system, are shown in combination with the analysis of the oil draining system, aimed to reduce the hydraulic losses. A potential is presented that engine manufacturer can obtain in terms of saving energy.