A Diesel Engine Ring Pack Performance Assessment 04-17-03-0013

Demonstrating ring pack operation in an operating engine is very difficult, yet it is essential to optimize engine performance parameters such as blow-by, oil consumption, emissions, and wear. A significant amount of power is lost in friction between piston ring–cylinder liner interfaces if ring pack parameters are not optimized properly. Thus, along with these parameters, it is also necessary to reduce friction power loss in modern internal combustion engines as the oil film thickness formed between the piston ring and liner is vital for power loss reduction due to friction. Hence, it has also been a topic of research interest for decades. Piston and ring dynamics simulation software are used extensively for a better ring pack design. In this research work, a similar software for piston ring dynamics simulation reviews the ring pack performance of a four-cylinder diesel engine. Each piston ring performance is reviewed by studying gas pressure at lands, ting position in the groove, oil film thickness, ring friction, ring twisting, and ring pack blow-by trend. As per the ring pack study, the top ring is experiencing ring collapse for some crank angle duration while the second ring is experiencing ring fluttering and reverse blow-by for some crank angle durations. This behavior has caused fluctuation in blow-by. Also, in the end, the oil consumption and blow-by measurements are done on the actual engine and compared with simulation results.