Four-Stroke Cycle and Ignition System
Detailed study of the four-stroke cycle and the ignition system that initiates combustion.
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Safety notice
- The ignition system generates high voltage; never touch spark plug wires or coils while the engine is running or the ignition is on.
- Allow the engine to cool before removing spark plugs to avoid burns.
What you will learn
- Describe each stroke of the four-stroke cycle in detail.
- Explain the purpose and operation of the ignition system and spark plugs.
- Understand the importance of ignition timing and its effect on engine performance.
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Key points
- The four strokes are intake, compression, power, and exhaust.
- The ignition system must deliver a high-voltage spark at the correct moment.
- Ignition timing directly affects power, efficiency, and emissions.
All values shown are training examples. Real thresholds depend on the manufacturer, engine, temperature and system — always confirm with the vehicle service documentation.
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