Internal Combustion Engines

What the page covers

The page opens with mind maps on how engines are classified. Combustion Engines Classification separates external combustion engines, such as steam engines and steam turbines, from internal combustion engines. It then splits the internal group into spark-ignition and compression-ignition types and sets out the four-stroke and two-stroke cycles.

Where to start

Begin with the classification maps, then read the note titled Internal Combustion Engines. It points out that a two-stroke engine of a given size and speed is more powerful than a four-stroke one, because it has twice as many power strokes per unit time. Next, open IC engines 2, a mind map comparing spark ignition and compression ignition. It covers fuel and air intake, weight and the speeds each type can reach. Basic Engine operation follows, with engine geometry, power and torque.

Parts and systems

Once the basics are clear, move on to the component maps. These include PISTON, CONNECTING ROD, Crankshaft, ENGINE HEAD and Lubrication Overview. There are also maps on turbochargers, diesel engine emissions and aircraft engines. The Yamaha R6 Dry Sump System map shows one real lubrication layout.

Using quizzes and maps together

1. Read a map and cover the branches you think you know.
2. Take a quiz such as 4 SI Engine or 4.6 Internal Combustion Engines. Questions there ask about superchargers, scavenging and closed-cooling systems.
3. Return to the map for any answer you missed.
4. Run through the flashcards, including IC Engines - equations and Parts of an SI Engine.

Where it sits

This unit belongs to the Energy Conversion Systems strand of Mechanical engineering. Pick the map that matches what you are studying today, then finish with a quiz and see what sticks.