This book elucidates new techniques and applications of automotive engine in a multidisciplinary approach. An engine is a machine used to convert chemical energy into mechanical energy through combustion of fuel. It is characterized by a high power-to-weight ratio. The different types of engines are heat engines, electric motors, clockwork motors, molecular motors, pneumatic motors, fire engines, etc. This book is designed to discuss in detail the various motors and their uses and functionality. Most of the topics introduced in it cover new techniques and the applications of engines. It studies, analyses and upholds the pillars of this subject area and its utmost significance in modern times. The various subfields of engines along with technological progress that have future implications are glanced at in it. This textbook is a complete source of knowledge on the present status of this important field.