Lesson Notes By Weeks and Term v4 - SHS 2
INTRODUCTION TO ENGINE TECHNOLOGY
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INTRODUCTION TO ENGINE TECHNOLOGY
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Subject: Applied Technology
Class: SHS 2
Term: 1st Term
Week: 2
Grade code: 2.1.1.LI.2
Strand code: 1
Sub-strand code: 1
Content standard code: 2.1.1.CS.1
Indicator code: 2.1.1.LI.2
Theme: AUTOMOTIVE TECHNOLOGY
Subtheme: INTRODUCTION TO ENGINE TECHNOLOGY
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Good day, students. We all know that when a car, a trotro, or even an okada runs for a while, its engine becomes very hot. Have you ever been stuck in traffic in Accra or Kumasi and seen a car on the side of the road with steam pouring from under the bonnet? That is a car with an overheating engine, a very serious problem. Today, we are going to learn about the system that prevents this from happening: the engine cooling system. Understanding this system is crucial for anyone who wants to drive, own, or repair a vehicle. It helps us keep our vehicles running efficiently, saves money on costly repairs, and ensures safety on our roads. We will focus on two main types of water-cooling systems.
A. The Purpose of the Engine Cooling System
An internal combustion engine generates a massive amount of heat. This heat comes from two main sources: Combustion: The explosion of the air-fuel mixture in the cylinders can reach temperatures over 2000°C. Friction: The rapid movement of internal parts like pistons, bearings, and gears creates heat through friction.
If this heat is not removed, it will cause major damage: The engine oil will break down and stop lubricating properly. Metal parts will expand, potentially causing pistons to seize (get stuck) in the cylinders. The cylinder head can warp (bend), and the head gasket can fail, leading to expensive repairs.
The cooling system's job is to manage this heat, keeping the engine at its most efficient operating temperature (usually between 85°C and 100°C). It removes about one-third of the heat generated by the engine. B. The Thermosyphon Water-Cooling System ("The Natural Flow System")