UNIT 4 UNDER THE BONNET copy

Unit 4 UNDER THE BONNET By the end of the lesson, students will be able to: Master some new words Know how to use phrases to talk about the things under the bonnet of a car. Be able to explain how a car engine works. Improve listening, reading, writing and speaking.

Unit 4: UNDER THE BONNET

What do these abbreviations means? Work with a

partner to see how many you know.

Brake horsepower Grams per kilometre Gasoline Direct Injection Miles per gallon

Miles per hour Newton metre Revolutions per minute Rear-wheel drive

Spark ignition Turbo direct injection

Label the diagram with words from the box

Clutch crankshaft engine gearbox piston propeller shaft

piston crankshaft

engine

clutch gearbox

Propeller shaft

• An engine produces power by burning air and fuel The fuel

is stored in a fuel tank (This is usually at the back of the

car.) The fuel tank is connected to a fuel pipe The fuel pipe carries the fuel to a fuel pump The fuel pump is connected

to the carburettor The fuel pump pumps the fuel into the

carburettor In the carburettor the fuel is mixed with air

The fuel and air are drawn into the engine In the engine

the fuel and air are burned to produce power

Are these statements true or false?

Correct them if they are false.

1 An engine produces fuel by burning air and power.

2 The fuel tank is usually at the back of a car.

3 Fuel is stored in a fuel tank.

4 The fuel pump pumps fuel to the fuel tank

5 The carburettor is connected to the fuel pump.

6 The carburettor mixes fuel and air

F T

T

T T

F

• The power from the engine turns the flywheel The flywheel

then turns the clutch The clutch is connected to the gearbox The clutch turns the gears in the gearbox The gearbox is

filled with oil The gears decrease the speed of the engine

• The gears turn the propeller shaft The propeller shaft then

turns the gears in the differential The differential is also filled with oil The gears in the differential turn the half shafts and

the half shafts turn the wheels

Answer the following questions:

1 What does the flywheel turn?

2 What is connected to the clutch?

3 Where does the clutch turn the gears?

4 What do the gears do?

5 Does the propeller shaft turn the gears in the gearbox?

6 What do the half shafts do?

The flywheel turns the clutch.

The clutch is connected to the gearbox.

In the gearbox.

the gears decrease the speed of the engine.

No, it doesn't The halfshaft turns the wheel.

distribution

Verb Noun Adjective

4 Find words in exercise 3 to complete the table Use

your dictionary if necessary.

transmitted

ignites explosion

powerful

combustion

2

3

Triangular

Rectangular

Square conical

Cuboid

spherical

Cylindrical

8 Listen to seven questions customers and match them with the answers (a-g) given by a technical support hotline employee.

8 Listen to seven questions customers and match them with the answers (a-g) given by a technical support hotline employee.

9 A potential customer is visiting the stand of a major car manufacturer at an international car show Listen to the dialogue and put these key features in the order in which they are mentioned.

2

2

3 4

5 6

7

10 Now listen again and note down what these numbers refer to.

Engine size in litres Engine power in brake horse power

Top speed in miles per hour

The new engines available later in the year

Fuel consumption around town in miles per gallon Fuel consumption for everyday driving

Price in pounds Wheel size in inches

11 Match the two parts to make sentences from the dialogue (listen again if necessary).

P I S O

Y L

N D R

W

S H E R

C I D

P A R K P L U G