RHEOLOGICAL RESEARCH REGARDING INTERNAL COMBUSTION ENGINES OILS

Andreea Mirela TELEAȘĂ, Alexandru Valentin RĂDULESCU, Sorin CĂNĂNĂU, Geanina Mihaela MATEESCU, Andreea Ștefania STAN

Abstract


The purpose of this work is to study the degradation of lubricants used in internal combustion engines, using experimentally determined measurements of rheological parameters, namely, viscosity, flow index, consistency index, as well as the variation of apparent viscosity with temperature.

Proper lubrication of the internal combustion engine is fundamental to minimize energy loss and wear, helping to increase fuel efficiency and extend engine life. One of the most important characteristics influencing the flow behavior of substances is viscosity. Changes in pressure and temperature can alter oil viscosity, and these changes are critical to the properties of the oil as it is used in the engine. Viscosity has a significant impact in the engine lubrication process because, with its help, we reduce the friction between the surfaces and after the friction, we avoid wear, and it can also register increases or decreases during the operation of the engine.

The tested oils in this work are BMW 5W30 and Castrol 5W30 engine oils, both fresh and used state, after a mileage of 10000 km for the first car and 12000 km for the second one. These were tested using the Brookfield CAP2000+ rotary cone and plate viscometer.


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