1. The Otto Cycle Jonathan Cheung 4M-F

2. Background Information: The Otto cycle is commonly known as the four-stroke cycle used in internal combustion engines Invented by Nikolaus Otto in 1876 Most commonly used for automotive and industrial purposes today Examples: Conventional gasoline, petroleum, and diesel engine in cars, trucks, and generators

3. The Process of the Cycle: 1.Intake stroke 2.Compression stroke 3.Ignition/Explosion 4.Power Stroke 5.Valve exhaust 6.Exhaust stroke

4. Intake StrokeCompression Stroke Ignition/Explosion Power Stroke Exhaust stroke Starting Position

5. Advantages of an Otto Cycle Engine: Drawbacks: Relatively good thermodynamic efficiency Relatively inexpensive to maintain and build Excellent power-to-weight ratio Good reliability Requires more moving parts and manufacturing expertise Engine is usually larger and heavier than a two-stroke engine or rotary engine of comparable power output. Conclusion: The Otto Cycle continues to be an integral and effective combustion cycle amongst many engines because it provides excellent efficiency and power output.

6. References: http://auto.howstuffworks.com/engine.htm http://home.earthlink.net/~graham1/MyToy otaPrius/Understanding/InternalCombustio n.htmhttp://home.earthlink.net/~graham1/MyToy otaPrius/Understanding/InternalCombustio n.htm http://en.wikipedia.org/wiki/Otto_cycle http://www.keveney.com/otto.html