Posted by : Sayantan Mandal Mar 25, 2010

The biggest difference to notice when comparing figures between a 2-stroke engine and 4-stroke engine is that the spark-plug fires once every revolution in a two-stroke engine but in case of four-stroke engine the spark fires once every other revolution. First of all lets discuss about the working of four-stroke engine...

 Today most of the cars use what is called Four-Stroke Combustion Cycle to convert gasoline into motion. The four-stroke approach is also known as the Otto cycle, in honor of Nikolaus Otto, who invented it in 1867. They are-

  • Intake Stroke
  • Compression Stroke
  • Combustion Stroke
  • Exhaust Stroke

Step 1
The piston starts from the top, the intake valve is opened by the Camshaft, and the piston moves down to let the engine take in a cylinder-full of gasoline and air. Only the tiniest drop of gasoline needs to be mixed into the air for this to work.--------This all Process is called Intake Stroke.
Intake Stroke of Four Stroke Engine

Step 2
Then the piston moves back to compress this fuel & air mixture. This all makes the mixture more denser, internal temperature of the cylinder increases. Hence--------Compression Stroke makes the Explosion more powerful.
Compression Stroke of Four Stroke Engine

    Step 3
    And when the piston reaches the top of the cylinder, the spark plug emits a spark and ignites the gasoline. The gasoline charge in the cylinder explodes, driving the piston downwards.-------This is called as Combustion Stroke.
    Power Stroke of Four Stroke Engine

    Step 4
    Once the piston hits the bottom of its stroke, the exhaust valve opens and the exhaust leaves the cylinder to go out the tailpipe.-------This is called Exhaust Stroke.
    Exhaust Stroke of Four Stroke Engine
      Now, in the next section we'll learn about two stroke engines and diesel engines, what's the basic difference and similarities between them---

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