An engine is a device which can be used to convert one form of energy into mechanical energy. Automotive engines are those which can be used for propelling an automobile. According to the energy conversion method, they are broadly classified into heat engines, electric motors and physically powered motors. Heat engines are thermodynamic systems which can convert thermal energy of fuel into mechanical energy. They are further categorized into internal combustion engine, external combustion engine and air breathing combustion engine. Ramjet, pulse jet, scramjet, gas turbines, steam turbines and reciprocating engines are some of its prominent examples. This book unfolds the innovative aspects of automotive engines which will be crucial for the holistic understanding of the subject matter. The topics included herein on this subject are of utmost importance. Those in search of information to further their knowledge will be greatly assisted by this book.