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The research work focus on the occurrence of incylinder peak pressure variation and fuel spray characteristics on piston seizure. The study has been carried out for direct injection diesel engine of heavy duty off-highway application. The well optimized and normal combustion results into the peak cylinder pressure variation within 3.5 bar to 4 bar, whereas the abnormal combustion signposts the peak cylinder pressure almost double of normal combustion. The research work has been carried out to study the effect of different peak cylinder pressure variation and its effect on the start of piston seizure. The three different range of peak cylinder pressure variation have been selected for the study. The selected range of peak cylinder pressure depicts normal to abnormal combustion characteristics. The effect on piston motion dynamics and start of piston seizure has been carried out successfully.

The stringent emission norms and increasing demand for engines with higher power density lead to an extensive investigation of parameters affecting combustion performance. Recent emission norms have forced the engine manufacturers to reduce the Particulate matter (PM) emissions along with other emissions substantially. In order to achieve lo PM emissions the lubrication oil consumption need to be controlled by optimizing piston group design with low liner bore distortion. Bore Distortion is the deviation of actual profile from perfect circular profile at any plane perpendicular to axis of cylinder. Liner bore distortion in engines causes' number of problems like deterioration of piston ring performance, liner-ring conformability issues, high lubricating oil consumption and emissions.

As per pieces of literature, 40 to 60 % of friction losses of Internal combustion engines occur in their piston-piston rings-liner assemblies and, there is a significant supportive role of simulation in improving this assembly. Literature is also available which tells, how changes in pistons affect oil consumption. Thus, piston dynamics is also important for oil consumption. Furthermore, the results from the simulation module of piston movement also serve as a significant input for postprocessing to calculate piston ring dynamics. This research is conducted to understand the piston secondary motion effect on oil consumption, friction, and blow-by. In this work, the results of ring dynamics and oil consumption simulation modules are studied with consideration and non-consideration of piston secondary motion results. The results like minimum oil film thickness, lubricating oil consumption, friction, friction power loss, and blow-by are investigated.