The Otto cycle is a 4-stroke cycle used in internal combustion engines. It involves intake, compression, power, and exhaust strokes. During intake, air and fuel are drawn into the cylinder. In compression, the mixture is compressed by the piston. In power, the mixture is ignited and expands, pushing the piston. In exhaust, the spent gases are forced out. Otto cycle engines are commonly used in cars and trucks due to their efficiency.

1. OTTO CYCLE
Objective: Explain what is the Otto
cycle, how it works and application
By: Jonathan Tang

2. Otto Cycle
 Also known as 4 stroke cycle in technical
terms
 A Cycle used in internal combustion
engines
 The first such engine was built by the
German engineer Otto in 1861

3. 4 Strokes of the Otto Cycle
 Cycle contains 4 strokes
1)Intake stroke
2)Compression stroke
3)Power stroke
4)Exhaust stroke

4.  Intake stroke
 Compression stroke
- Intake valve opens and a
mixture of air and fuel with a
relatively low pressure (near
atmosphere) is drawn into the
cylinder. As piston begin to move
back up, intake valve closes.
-With both valve closed, the fuel-air
mixture is compressed by the
upward movement of piston,
causing a rise in pressure.

5.  Power Stroke
 Exhaust Stroke
-The mixture is ignited by spark
plugs with the piston staying nearly
fixed, leading to a rise in pressure
and temperature.
-The hot gas is then allowed to do
work by pushing the piston back.
-The exhaust valve is opened and
some exhaust escapes with the
piston remaining fixed.
-The piston forces the remaining
exhaust to escape. The exhaust
valve is then closed, the intake valve
opened, and the cycle repeats

6. Applications
 Common cycle used in internal combustion
engines.
 Otto cycle (4 stroke) engines are commonly
used in most cars and trucks today
Conclusion:
 Otto cycle engines are most commonly used
compare to 2 stroke or Wankel (rotary) engine

7. References
 http://en.wikipedia.org/wiki/Otto_cycle
 http://scienceworld.wolfram.com/physics/OttoCycle.html
 http://www.keveney.com/otto.html
 http://www.grc.nasa.gov/WWW/K12/airplane/engopt.html