Exhaust manifold

Exhaust Manifold

An engine manifold is a cast iron/cast alloy component that acts as a passage to collect the hot exhaust gases from the engine exhaust port and direct it into the turbocharger or to the silencer. The engine manifold is nothing but a set of pipes that connects all engine cylinder exhaust ports and acts as the first component in the exhaust system.

Type of Exhaust Manifold:

Types of exhaust manifolds are based on the type of engine.

  1. Single Cylinder Exhaust Manifold
  2. V-type twin-cylinder exhaust manifold
  3. Multi-cylinder exhaust manifold
  4. Gasoline engine exhaust manifold
  5. Diesel engine exhaust manifold
  6. Cast Iron manifold
  7. Stainless steel fabricated manifold

Design Consideration for Exhaust Manifold:

Following application, requirement is considered for designing an exhaust manifold

  • Engine exhaust gases temperature (900-degree Centigrade to 1100 degree centigrade)
  • Space in engine compartment
  • Engine exhaust gas pressure (max and min operating range)
  • Turbo Charger / Without Turbocharger design

Application Requirement of exhaust manifold:

An exhaust manifold must have,

  • Good thermal fatigue strength
  • High oxidation resistance
  • Minimum restriction to the flow of the exhaust gases
  • The exhaust manifold should not generate backpressure
  • Good heat dissipation ability
  • Ability to withstand in high vibration & cyclic load

The following animation helps you to understand the application/function of the exhaust manifold. The exhaust manifold directs hot exhaust gases from the engine exhaust port to the turbocharger.

Another important function of the exhaust manifold is to maintain a leak-proof connection between,

  • Engine exhaust port inlet of the exhaust manifold
  • Exhaust manifold outlet and turbocharger/silence input

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