WAEC SSCE Auto Mechanics
Study notes for EXHAUST SYSTEM — part of the WAEC SSCE Auto Mechanics syllabus. 1 learning objectives with explanations and exam tips.
The exhaust system removes burnt gases from the engine after combustion. It starts at the exhaust manifold, which collects hot gases from all cylinders, then passes through the silencer to reduce noise, and finally exits through the tailpipe. Think of it like a drainage system for your engine's waste gases.
The exhaust manifold is made of cast iron and withstands extreme heat. Common silencers in Nigeria are absorption types that use fibreglass material, and reflective types that bounce sound waves back. Most Nigerian commercial vehicles like Dangote trucks use reactive silencers because they're durable and affordable.
The whole system prevents noise pollution, protects the environment by managing emissions, and improves engine performance. Without it, your vehicle would sound like a generator and create terrible fumes.
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