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The development of I.C. engines is a sophisticated process bringing together a multitude of specialists. It is important that all of these specialists work together as a team and communicate effectively. One tool of communication can be an integrated engineering software package that simulates many of the important facets of engine operation, and describes their essential interactions. Then, if changes are made in one part of the hardware or in operating conditions, their effects on other components of the system can be assessed. This paper describes initial efforts made in that direction through the development of a comprehensive engine simulation code, IRIS, which permits a coupled analysis of engine performance and component thermal and structural state.