Level 1 · Fundamentals
Petrol and Diesel Engines
Combustion, the four-stroke cycle and the essential differences between SI and CI engines.
5 Lessons
45 min
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1
The Four-Stroke Cycle
beginner
Intake, compression, power and exhaust — the beating heart of the engine.
9 min
1 Exercise
2
Petrol vs Diesel
beginner
Spark ignition versus compression ignition, and what changes for the technician.
8 min
3
Combustion and Emissions Basics
beginner
Air-fuel ratio, lambda and the three main pollutants.
8 min
1 Exercise
4
Firing Order and Valve Timing
intermediate
Why cylinders fire in a set sequence, how the camshaft is timed to the crankshaft, and what a slipped belt or chain really costs.
11 min
1 Exercise
5
Two-Stroke vs Four-Stroke
beginner
How a two-stroke engine makes power every revolution, and why the four-stroke dominates cars.
9 min
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Module quiz
6 Questions · Pass mark: 70%