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Flashcards in Air Induction And Exhaust Systems Deck (36)
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1

What is central purpose of an air induction system?

Supply the engine with an ample supply of cool, clean air for combustion

2

An air induction can be composed of what parts?

Air cleaner(s), Pre-cleaner(s), Air filter(s), Dust ejection system(s), restriction indicator, filter housing(s), Inlet tubing, Clamp, Hoses, Cold/hot air intake systems, Manifold(s) and gaskets, Shutdown devices

3

What are the main functions of the air induction system?

Cleans the air supply, Silences the inlet airflow, Provides air for combustion, Cools air, it allows extra airflow when blowers and turbo's are used.

4

Maximum engine performance occurs when air is less then?

33 C

5

2 stroke engines are considered to be:

Naturally aspirated, unless equipped with turbo

6

Engines without a turbocharger are considered to be?

Naturally aspirated

7

What factor can limit the volumetric efficiency of a engine?

Engine operating speed, Air humidity, Air temperature, Altitude, Liner and ring condition, Valve adjustment and cam condition, Air filter and inlet tubing condition

8

Naturally aspirated engines may have a volumetric efficiency of?

75-85%

9

Pre cleaners may be able to remove what percentage of large particles?

80%

10

What is called when exhaust gases cause the dust ejectors to dump?

Exhaust gas aspirator

11

What are the two types of air filter assemblies?

Wet or Oil bath
Dry type

12

How effective are each of the different types of air filter assemblies ?

Oil bath - up to 98.5%
Dry type - up to 99.5%

13

Dry filters are commonly constructed of what?

Pleated paper

14

Screw on constant torque clamp must extend how far?

1/4"

15

Seals and gaskets should:

Be replaced when components are disconnected

16

Air shutdown devices should only be used when?

In a emergency situation

17

Air shutdown devices should be inspected on a regular basis for?

Condition and freedom of movement

18

Components used in an exhaust system can include?

Manifolds and gaskets, Piping, Mufflers, Catalytic converters, particulate traps, Heat shields, Spark arrestors

19

When an exhaust system is routed past a cab or sleeper:

Components must be secure, leak free, quiet and not create vibrations

20

Exhaust manifolds are commonly constructed of what?

Cast iron

21

Straight through muffler

Allows exhaust gases to pass directly through a central tube in the muffler

22

Reverse flow muffler

Cause the exhaust gases to change direction as they pass through the inside of the muffler

23

Mufflers are typically constructed of?

Mild steel although stainless is becoming more common

24

Exhaust stack

is the point at which the exhaust gases leave the exhaust system

25

Stacks can sometimes have what? what is purpose?

Rain cap. Keep water and other contaminates out of the exhaust system

26

80% of cylinder wear related to contaminated air can be prevented by?

An effective pre-cleaner

27

When ideal combustion does not occur exhaust gases can include?

Carbon monoxide, Unburned fuel, Oxides of nitrogen, Carbon

28

12 ounces of dirt has the ability to?

Destroy an engine

29

Loose, missing or incorrect fasteners on an exhaust system are likely to cause?

Leakage problems

30

A faulty induction or exhaust system can cause what 3 major problems?

Lack of power
Black smoke
Premature engine wear