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Recent trends towards design of High Performance Diesel engines creating more challenges in the area of design, durability and NVH aspects of components and systems. In particular, Valvetrain system of High Speed application engines is one of the most critical and complicated dynamic system in terms of precise control of events, max. Lift, control over accelerations and vibration related issues. This can be tackled by designing the cam profile for better valve train dynamics. High frequency components and/or excessive jerks in a cam profile are important sources of cam-follower vibrations. There are various techniques of designing cam profile to achieve controlled valve train dynamic behavior at high speed operations. Present paper discuss the impact of various cam profile options designed using Polydyne, N-Harmonic and B-Spline methodologies on a field problem of cam wear for high speed engine application.

Small power diesel engines are most demanding product in Indian market for stationary applications like power genset, agricultural purpose etc. The upcoming 2013 CPCB emission norms for diesel genset engines below 19 kW power rating are the most stringent one in the world. There is a need not only to upgrade technologies pertinent to the latest emission norms but also to reduce the product cost. This paper presents various design strategies used to meet the desired engine performance and emission levels for development of a series of small power diesel genset engines having bore dia. ranging from 76 mm to 120 mm.

The intensifying needs demanded by the legislation, shorter product development cycle and utmost attention given to durability aspects of product have surfaced out various complex technical areas in the field of engine out emissions, FIP hydraulics, computational fluid dynamics, thermal analysis and structural design of components. This paper is an endeavour to present the gesticulations used in one of the upgradation program for improving engine performance to meet desired emission and performance levels with the help of simulation tools and statistical database. The single cylinder air cooled D. I. engine under development is explored first for possible improvements in induction and exhaust systems, FIP performance and combustion package, valve train layout, cylinder head design, fin layout and pattern, features for improvement in oil consumption, modifications in engine block and crankcase etc.