Page 92 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

than the density at atmospheric pressure specially at higher altitudes, turbo charges helps the engine to get the
sufficient air. An engine may have one or more turbo chargers.

A turbocharger is mounted on the exhaust manifold. It has a turbine wheel (1) and a compressor wheel (2) on the
same shaft (3). Exhaust gases enter in turbine housing (4) and rotate the turbine wheel (1). Compressor housing’s
(5) inlet is connected to the air cleaner and compressed air is discharged to inlet manifold through the outlet (6).

Types of Turbochargers

The following types of turbochargers are used in automobiles:
1 Single-turbo
2 Twin-turbo
3 Twin-scroll turbo

4 Variable geometry turbo
5 Variable Twin Scroll Turbo
6 Electric Turbo
1 Single-turbo
Single-turbo - types of turbochargers The most common type of turbocharger is the single turbocharger.
Different torque characteristics can be obtained by changing the size of the components in the turbo. Larger
turbos provide higher-end power, while smaller turbos can spool faster and produce better low-end power.

They are expensive to increase engine power and efficiency, and as they become more popular, they allow
smaller engines to increase efficiency by naturally producing the same power as larger engines, but with less
weight.
However, they work best in a narrow RPM range, and drivers will usually feel “turbo-lag” until the turbo begins to
operate in its peak rev band.

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CITS : Automotive - Mechanic Diesel - Lesson 25 - 28 CITS : Automotive - Mechanic Diesel - Lesson 25 - 28