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The Exhaust System:
Exhaust Manifold
The exhaust manifold collects the burned gases expelled from the engine cylinders and directs them into the exhaust pipe.
Manifolds may be made of cast iron or be assembled from steel tubing. Usually, flanges are made on the manifold where it connects to the engine and to the exhaust pipe. The mating surfaces of the flanges are machined to a smooth finish for an airtight seal against the engine and the exhaust pipe to prevent exhaust gases from leaking. Sometimes metal-to-metal contact provides the seal, but most of the time asbestos gaskets are used. Nuts made of brass are used to secure the manifold flanges because brass does not rust. The extreme heat causes steel nuts to rust very rapidly and then they are hard to remove.
While not as common, some vehicles use exhaust manifolds with water jackets. The liquid coolant used to cool the engine passes through the exhaust manifold water jackets before returning to the radiator. This aids in reducing the temperature of the exhaust gases, reducing the amount of noise, and reducing the damage that exhaust heat causes to the exhaust system and other nearby parts.
Exhaust passages inside the manifold must be fairly smooth and free of any obstructions that would slow the flow of exhaust gases. |
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1. Exhaust System
2. Exhaust Introduction
4. Exhaust Pipe
5. Muffler
6. Tailpipe
7. Single Or Dual Exhaust Systems
8. Turbocharger
9. Special Bypasses
10. Exhaust System Inspection
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