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Lesson 1 · grade 10+
How an engine works: 4 strokes in 5 minutes
📖 Lesson
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🎯 Quiz — pick the translation
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✅ Lesson done
A petrol engine is a pump turning explosions into motion. 4 strokes: INTAKE (piston down, valve open, mixture in) → COMPRESSION (valves closed, ~10:1) → POWER (spark plug fires, explosion pushes piston — the only stroke doing work) → EXHAUST (exhaust valve opens, gases out). A hundred revolutions per second, millions of times. Diesel works the same without a spark plug: compression (~20:1) ignites the mix.
- ●Oil = engine blood: check monthly, dipstick with engine off
- ●Overheating kills: temp light = stop, never open a hot radiator!
- ●Timing belt failure = valves meet pistons: change on schedule
🔥 An average engine turns ~3000 rpm — the piston travels 100× per second. Billions of cycles over 100,000 km.
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Test yourself!
Quiz — pick the translation →
🖨 Worksheet
Practice the topic with the trainer — like after class