Lesson Notes By Weeks and Term v4 - SHS 3
INTRODUCTION TO ENGINE TECHNOLOGY
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INTRODUCTION TO ENGINE TECHNOLOGY
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Subject: Applied Technology
Class: SHS 3
Term: 1st Term
Week: 3
Grade code: 3.1.1.LI.3
Strand code: 1
Sub-strand code: 1
Content standard code: 3.1.1.CS.1
Indicator code: 3.1.1.LI.3
Theme: AUTOMOTIVE TECHNOLOGY
Subtheme: INTRODUCTION TO ENGINE TECHNOLOGY
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This lesson introduces the engine's air intake system, which can be thought of as the engine's "respiratory system." Just as humans need to breathe clean air to live and perform well, an engine needs a constant supply of clean air to burn fuel efficiently and produce power. We will explore how a car, a trotro, or an okada gets the air it needs to move. Understanding this system is crucial for vehicle maintenance, improving fuel economy, and reducing pollution, all of which are important issues for drivers and the community in Ghana. A poorly maintained air intake system can lead to higher fuel costs at the pump and more smoke from the exhaust pipe.
Introduction: Why Does an Engine Need to "Breathe"?
An internal combustion engine creates power by burning a mixture of fuel (petrol or diesel) and air. This is a chemical reaction called combustion. For this reaction to be efficient, the engine needs a very specific ratio of air to fuel, approximately 14.7 parts of air to 1 part of fuel (14.7:1) for petrol engines. The air intake system has two main jobs: To provide a clean supply of air. To control the amount of air entering the engine.
Think of it like making a fire. If you starve the fire of air, it smoulders and produces a lot of smoke (incomplete combustion). If you give it the right amount of air, it burns brightly and hot (efficient combustion). The engine is the same. The Path of Air: Components and their Functions
The air follows a specific path from the atmosphere into the engine's combustion chamber. Let's follow this journey step-by-step.