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Estimation of the ignition delay and concentration of exhaust emissions carries great importance in engine development process. In direct injection (DI) diesel engines, ignition delay has direct effect on startability, noise and pollutant formation. Hydrocarbon (HC) emissions are mainly due to the unburnt or partially burnt fuel leaving the engine exhaust system. In the present work, correlations have been developed for ignition delay and HC emissions. Satisfactory comparison of predicted and experimental values of ignition delay and HC emission under different operating conditions for various engines, widely varying in dimensions, method of aspiration and rated speeds validated the correlations. These correlations are useful as design tools for engine development.

Two stage turbo charging provides a suitable method to achieve a significant increase of the boost level, as well as a wider operating range for a diesel engine. This paper describes detailed and easily applicable method for two stage turbocharger matching for constant speed engine, in view of finding an optimal combination of turbochargers - low and high pressure ones. It also describes technique that can be used for optimizing solution with better fuel consumption and boosting together with satisfying of all given constraints such as maximum before turbine and compressor out temperatures, maximum turbocharger speed, peak cylinder pressures and smoke limit. This paper presents evaluation of potential for two stage turbocharger for power generation application by simulation and then experimental results.

A new high performance 1.4 litre naturally aspirated IDI engine with advanced comet type precombustion chamber has been designed and developed within a duration of 2.5 years for Tata Minicar. The prototype could be developed in a short time of 8 months due to extensive use of CAD/CAM facilities and close interaction with suppliers along with simultaneous engineering methods. A power rating of 40.5 hp/lt could be achieved due to extensive optimisation of combustion parameters such as geometry of precombustion chamber and fuel injection parameters. This paper describes the features of this engine along with development strategy adopted to achieve the performance and durability targets.