Two Stroke Internal Combustion Engines - PowerPoint PPT Presentation

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Two Stroke Internal Combustion Engines

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Two Stroke Internal Combustion Engines *How a two stroke engine works *Advantages/Disadvantages About this lesson. This lesson contains hypertext links to www ... – PowerPoint PPT presentation

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Title: Two Stroke Internal Combustion Engines


1
Two Stroke Internal Combustion Engines
  • How a two stroke engine works
  • Advantages/Disadvantages

2
About this lesson.
  • This lesson contains hypertext links to
    www.howstuffworks.com.
  • If you are connected to the internet, click on
    the link icon and scroll to the animation at the
    sight.

3
Introduction to the Two Stroke Engine
  • This type of engine is commonly found in
    applications such as
  • lawn and garden equipment
  • dirt bikes
  • small outboard motors

4
Introduction to the Two Stroke Engine
  • Two stroke engines have advantages over four
    stroke
  • simplified construction (no valves)
  • fire once every revolution for a significant
    power boost
  • Great power to weight ratio

5
The two stroke cycle
  • The two stroke engine ignites every revolution of
    the crankshaft. These engines overlap operations
    to reduce parts while maintaining power.

6
The two stroke cycle
  • After the fuel air explosion, the piston is
    driven down. As the piston reached the bottom of
    its stroke, the exhaust port is uncovered. Most
    of the gases are driven out.

7
The two stroke cycle
  • When the piston has bottomed out, the intake port
    is uncovered. The new fuel enters and is ready
    for compression and combustion.

8
The two stroke cycle
  • When the fuel mixture is being compressed a
    vacuum is created in the crankcase. The vacuum
    opens a reed valve and sucks air/fuel/oil in from
    the carburetor.

9
The two stroke cycle
  • Simply put, in a two stroke engine you have only
  • Compression
  • Combustion
  • Thus, Two Strokes.

10
2 stroke compared to 4 stroke
  • In two stroke engines the crankcase is a
    pressurization chamber to force fuel/oil/air into
    the cylinder. Here you mix oil and gas to
    lubricate internal parts.
  • In four stroke engines the crankcase is separate
    from the compression chamber. This allows the
    use of heavy oil for lubrication.

11
Disadvantages of a two stroke
  • The engines do not last as long due to poor
    lubrication.
  • You have to mix two cycle engine oil with
    gasoline.
  • The engines do not use fuel efficiently.
  • These engines produce a lot of pollution.

12
Summary
  • Two stroke engines are great for the power to
    weight ratio and their simple design, however,
    due to there pollution concerns these engines
    will be harder to find.

13
Source
  • www.howstuffworks.com
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