how the four-stroke engine

History, four-stroke engine, Otto cycle, Diesel cycle, Thermodynamic Analysis, Fuel octane rating, Diesel Engines, Design and engineering principles.

You can read it in http://en.wikipedia.org/wiki/Four-stroke_cycle


Animated Engines, Four Stroke Engine, Intake, Compression, Power, Exhaust and Ignition System.

You can read it in : http://www.animatedengines.com/otto.html

Okay, hopefully this information useful.