This book on internal combustion (IC) engines is a part of the curriculum of mechanical engineering in major universities. It is the result of Dr. Thipse’s practical industrial experience and research work, besides teaching the subject for several years in different universities. The subject has been dealt with from all angles and is written in a concise, clear and logical manner. New trends and recent developments in the field of IC engines have been discussed in detail. The book includes solutions to a wide variety of numerical problems appearing in a diverse array of examinations. The book serves a dual purpose as it can be used by both students and engineers. It will serve as a textbook for engineering students studying the subject at the undergraduate level, while automotive engineers can use the book as a reference.