This book presents a thorough study of a single area of application - internal combustion engines. It breaks new ground by using engines as the means of explaining thermodynamics and combustion processes and it offers a constructive mix of basic engineering science with a real world application. The book is intended to provide a background for engine design, analysis and modelling. This book should be of interest to intermediate and senior undergraduate and early postgraduate students of mechanical engineering on thermodynamics or fluid mechanics courses.