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A major task ahead of engine manufacturers today is to extract the maximum power output from the engine while improving the reliability and durability, this is even more significant in case of applications such as power generation where engine experiences high loads for a prolonged period of time. Durability of valve train components in such cases greatly affects the overall engine life and service intervals. Majority of power generation engines running at medium speed employ pushrod type valve train. The high valve train inertia along with continuous operation at high loads poses as different set of problems for such engines. A significant amount of wear can occur at various valve train part interfaces which eventually leads to change in valve lash. A large change in valve lash beyond a certain point deteriorates the engine performance and emissions; it also accelerates the wear further.

In order to meet emission norms, modern day diesel engines rely on methods of in cylinder emission reduction and expensive exhaust after treatment devices. Engine manufacturers across the world are finding it hard to maintain balance between customers' demand for better fuel consumption and obeying the stringent legislative emission regulations. Optimum combination of variables such as piston bowl shape, compression ratio, fuel injection and turbo charging systems precisely matched with engine, Exhaust Gas Re-circulation (EGR) rate etc can result in refined combustion leading to better engine out emissions as well as fuel efficiency. Optimization of piston bowl geometry and EGR rate would require a lot of experiments, which involves cost and time. If the numbers of variants of piston bowl shapes or EGR rates are more, so would be the expensive and require more testing time.