Page 332 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

Pre-heater helps to warm up the engine faster during cold weather. It is typically installed in the intake manifold of
the engine, which is the part that distributes the air-fuel mixture to the cylinders.

The engine produces power by combusting air and fuel mixture and a heat source, and today we shall discuss the
component responsible for passing air into the engine.
Intake Manifold can be defined as a series of tubes that are attached forming a single body and placed overhead
of engine head, the air enters the engine passing through the air filter then through the throttle body and then
finally paving its way into the intake manifold.
As the air enters the intake manifold it is passed through a series of sensors that are located to determine various
components of air coming in, for example, its density, oxygen amount, moisture and various other characteristics
that are very important for achieving proper air-fuel mixture and hence highly optimized engine performance.

The intake manifold consists of mainly 2 components
1 Plenum
The plenum is the large cavity at the top of the manifold.
2 The runners.
Runners are individual tubes running each to the cylinder head.
Working

The design of the intake manifold is very important for achieving good volumetric efficiency.

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CITS : Automotive - Mechanic Diesel - Lesson 98 - 103 CITS : Automotive - Mechanic Diesel - Lesson 98 - 103