By Nick Johnson

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Engines

• By Nick Johnson

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How Engines Work

• Gasoline is poured into the engine.
• It is then compressed by the piston.
• Then the gasoline is ignited by the spark plug.
• The exploding gasoline creates motion in the
  engine.
• The exhaust is pushed out of the engine and the
  process repeats.

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Octane Ratings

• Your octane rating describes how much your
  gasoline can be compressed.
• In simple terms the higher your octane rating is
  the lower chance your engine has of knocking.
• There are three types of gasoline are regular,
  mid-grade, and premium.
• Regular is the lowest and Premium is the highest.

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Octane ratings continued

• Regular has a rating of 87.
• Mid grade and Premium gasoline arent constant.
• One state may require a minimum premium octane
  level different then other states.
• Some people believe that higher octane gasoline
  cleans your engine, this is not true all gasoline
  has the same detergents.

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Effects of Compression

• The more compressed the gasoline the more
  powerful the explosion is.
• If you compress the gasoline to much it may
  explode (this is called knocking).
• Knocking can harm your engine.
• If you have a higher octane rating you have less
  of a chance of knocking.

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4 Stroke

• The four strokes of the cycle are intake,
  compression, power, and exhaust.  Each
  corresponds to one full stroke of the piston,
  therefore the complete cycle requires two
  revolutions of the crankshaft to complete.

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2 Stroke

• The two stroke engine employs the crankcase as
  well as the cylinder to achieve all the elements
  of the Otto cycle in only two strokes of the
  piston.

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Here is some more animated engines

• Wankel Engine Atkinson Engine