What among the following is the firing order of a four-cylinder engine?

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RRB ALP Mechanic Diesel 21 Jan 2019 Official Paper (Shift 1)
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  1. 1342
  2. 1243
  3. 1423
  4. 1234

Answer (Detailed Solution Below)

Option 1 : 1342
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Explanation: 

Firing order:

  • The firing order is the sequence in which the power stroke takes place in each cylinder in a multi-cylinder engine.
  • The firing order in which cylinder deliver their power strokes is selected as a part of the engine design to obtain the best engine performance.
  • The firing order is shown by the sequence of the number of cylinders in which the cylinders deliver their power strokes.
  • The nearest cylinder to the radiator is designated as the number one cylinder in an inline engine.

The firing order of the multi-cylinder engine:

  • Three cylinders: 1 - 3 - 2
  • Four cylinders: 1 - 3 - 4 - 2
  • Five cylinders: 1 - 3 - 5 - 4 - 2
  • Six cylinders: 1 - 5 - 3 - 6 - 2 - 4
  • Eight-cylinder inline engine: 1 - 8 - 7 - 3 - 6 - 5 - 4 - 2
  • Eight cylinder V-8 engine: 1 - 3 - 2 - 5 - 8 - 6 - 7 - 4
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