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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.

Performance and emission tests have to be carried out on range of engines having wide applications and varied specifications. In this context situation compels to adopt critical measures and revamp the methodologies in the area of design and development / matching of cardon shafts, rubber couplings and development of test bed systems for testing of single / two cylinder engines. Considering this need, a new strategic design approach has been formulated, which have reduced cost, loss of time and serious damages. This paper outlines a modern and practical approach used along with in-house available tools for controlling various dynamic behavioral issues involved. Redesign of shafts and couplings is done based on the comprehensive mass elastic data obtained from variety of engines. Apart from conventional torsional and bending vibration theories, FE and experimental tools are used to understand the modal behavior of engine coupled systems.