The four phase Otto Cycle is a cycle used within internal combustion engines, and in particular in petrol engines. It is named after the German engineer, Nikolaus August Otto (1832-1891) who conceptualised the method in 1876. It is still fundamental to almost all petrol engines in the world today.

Induction and compression

combustion engine induction and compression stroke

Power and exhaust stroke

combustion engine power stroke and exhaust stroke
Amazon item
Image of Introduction to Internal Combustion Engines
Author: Richard Stone
Publisher: Palgrave Macmillan (1999)
Binding: Paperback, 664 pages