Small Engine Function

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Small Engine Function

• Senior 1
• Mr. Lang

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We will cover

• The two types of small engines.
• What small engines are used in
• The major components of the engine
• The operation of an engine
• What you need to know

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What we will be working with..

• There are 2 types of small engines. A 2 stroke
  and a 4 stroke. 2 Stroke engines complete the
  intake, compression, power and exhaust strokes in
  one revolution of the engine. 4 stroke engines
  use 2 revolutions or 4
• This is a Briggs and Stratton 3 horsepower 4
  stroke engine. We will be learning and working
  with these engines.

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Small Engines

• Used in..
• Motorcycles
• Lawnmowers
• ATVs
• Marine
• Etc.

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The Components

• A Intake Valve, Rocker Spring
• B Valve Cover
• C Intake Port
• D Cylinder Head
• E Coolant Jacket
• F Crankcase (Block)
• G Oil Pan
• H Sump
• I - Camshaft
• J Exhaust Valve, Rocker Spring
• K Spark Plug
• L Exhaust Port
• M Piston Rings
• N Connecting Rod
• O Connecting Rod Bearing
• P - Crankshaft

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The Operation (Outside)

• These engines have 4 different strokes to
  complete one cycle of the engine.
• Intake, Compression, Power and Exhaust strokes.
• On the left is the recoil cord. This starts the
  engine. On the right is the output end of the
  crankshaft, which turns whatever is hooked up to
  it.

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The Intake Stroke

• Intake valve opens, fuel/Air mixture sucked in by
  engine vacuum through intake port. The vacuum is
  created by the piston heading downward. (Blue
  bubbles Fuel/Air Mixture)

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Compression Stroke

• Intake valve closes, fuel/Air mixture is
  compressed by the piston coming up.

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Power Stroke

• Compressed fuel/air ignited by spark plug. Piston
  driven downward giving power to the crankshaft.
  (Orange)

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Exhaust Stroke

• Exhaust valve opens, burnt fuel/air mixture
  (exhaust) pushed out of cylinder through exhaust
  port by piston coming up. (Grey)

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The Operation (Inside)

• Intake Fuel/Air mixture sucked in by engine.
  (Blue bubbles)
• Compression Fuel/Air compressed by piston
  coming up.
• Power Compressed fuel/air ignited by spark
  plug. Piston driven down. (Orange)
• Exhaust Burnt fuel/air pushed out by piston
  coming up. (Grey)

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Things to know

• All parts of the engine
• The four strokes of the engine cycle
• The explanation of what happens in each stroke
• The different applications for small engines

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Resources

• http//www.findsounds.com/ISAPI/search.dll?keyword
  sFerrari
• http//www.keveney.com
• http//www.google.ca