Practice question

What is meant by 'ignition timing' in a petrol engine?

  1. The time it takes for the starter motor to crank the engine
  2. The precise crankshaft angle (before Top Dead Center) at which the spark plug fires to ignite the air-fuel mixture for maximum power and efficiency
  3. The interval between oil changes
  4. The time required to charge the battery

Answer: B — The precise crankshaft angle (before Top Dead Center) at which the spark plug fires to ignite the air-fuel mixture for maximum power and efficiency

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