The internal combustion engine examined in terms of the four fundamental disciplines that determine its characteristics: 1) fluid mechanics; 2) chemistry of combustion and of exhaust emission; 3) first and second laws of thermodynamics, and 4) mechanics of reciprocating and rotary motion; high output Otto and Diesel engines for terrestrial, maritime and aerospace environments; normal and abnormal combustion; stratified charge and advanced low emission engines; hybrid and multifuel engines; Sterling and other space engines; free-piston and rotary-piston concepts and configurations.