An internal combustion is defined as an engine in which the chemical energy of the fuel is released inside the engine and used directly for mechanical work. The internal combustion engine was first conceived and developed in the late 1800’s. The man who is considered the inventor of the modern IC engine and the founder of the industry is Nikolaus Otto (1832-1891).

Over a century has elapsed since the discovery of IC engines. Excluding a few development of rotary combustion engine the IC engines has still retained its basic anatomy. As our knowledge of engine processes has increased, these engines have continued to develop on a scientific basis. The present day engines have advances to satisfy the strict environmental constraints and fuel economy standards in addition to meeting in competitiveness of the world market. With the availability of sophisticated computer and electronic, instrumentation have added new refinement to the engine design.

From the past few decades, automobile industry has implemented many advance technologies to improve the efficiency and fuel economy of the vehicle and i-VTEC engine introduced by Honda in its 2002 Acura RSX Type S is one of such recent trend in automobile industry.