Module 7,8,9

Question 1

List the 3 major components of the ignition system

Answer 1

• Magneto
• Ignition leads
• Spark plugs

Question 2

What is Flashover and what is a common cause of it?

Answer 2

Cracked distributor block causes sparks to jump between electrodes

Question 3

What is the purpose of the breaker points?

Answer 3

To collapse the field of the primary circuit

Question 4

What is the purpose of the condenser?

Answer 4

• prevents arcing across points

- Increases intensity of collapsed field across secondary winding

Question 5

When the magnetic poles line up with the pole shoes, the rotor position is referred to as:

Answer 5

Full register

Question 6

The spark is created when the breaker points_______.

Answer 6

Open

Question 7

This breaker points are opened with by a__________.

Answer 7

cam

Question 8

What is “E-Gap”?

Answer 8

Greatest stress exists on a magnetic field (Efficiency Gap)

Question 9

How is the internal timing of a magneto (E-Gap) adjusted?

Answer 9

Bendix Timing kit

Question 10

The high tension voltage travels from the secondary winding to the distributor gear, to the __________, to the spark plug lead, then to the __________.

Answer 10

• Distributor block

- Ignition lead

Question 11

What is the purpose of an impulse coupling?

Answer 11

Helps create a spark closer to TDC with a fast rotating spring on the rotor

Question 12

What is the purpose of an ignition lead leakage test?

Answer 12

Checks integrity of insulation

Question 13

How does an all weather ignition spark plug lead differ from a regular lead?

Answer 13

Larger barrel nut

Question 14

Name 2 types of spark plugs (identified by electrode end)

Answer 14

• Massive electrode

- Fine Wire

Question 15

What is the difference between a “hot” and a “cold” spark plug?

Answer 15

• Hot = may cause pre ignition or engine run on

- Cold = May cause fouling with carbon or lead deposits

Question 16

What action should be taken if a spark plug is dropped onto the floor?

Answer 16

It must be replaced cause the ceramic insulator may have cracked

Question 17

If the spark plugs on a 4 cylinder engine are to be rotated, and the firing order is 1, 3, 2, 4, where would the spark plug be installed if it was removed from the
bottom of #3 cylinder?

Answer 17

Top of 2

Question 18

If the spark plugs on a 4 cylinder engine are to be rotated, and the firing order is 1, 3, 2, 4, where would the spark plug be installed if it was removed from the
bottom of #3 cylinder?

Answer 18

Top of 2

Question 19

List the 3 engine controls for a carbureted engine

Answer 19

• Throttle
• Mixture
• Carburetor Heat

Question 20

Does the main metering jet have a fixed or variable orifice?

Answer 20

Fixed

Question 21

According to Bernoulli’s Principle, what happens to air velocity, static pressure and temperature in a venturi

Answer 21

As velocity = up, static and temp = down

Question 22

What causes the fuel from the float bowl to flow out of the main discharge nozzle?

Answer 22

Ambient Pressure

Question 23

As altitude increases, air density __________.

Answer 23

decreases

Question 24

The main valve in a carburetor that controls airflow to the cylinders, is call the __________ valve.

Answer 24

Throttle valve

Question 25

When is the manifold pressure highest with the engine running?

Answer 25

Full Throttle

Question 26

When is the manifold pressure lowest with the engine running?

Answer 26

Idle

Question 27

What is the purpose of the accelerator pump

Answer 27

Injects a shot of fuel into the airstream to prevent the lag from the throttle rapidly advancing and the increase in RPM

Question 28

What is the purpose of the mixture control

Answer 28

Allows to lean out the mixture for a given amount of air

Question 29

Precipitation in the air could cause

Answer 29

Carb ice

Question 30

When carburetor heat is selected will the engine initially run rough or smooth?

Answer 30

It will run rough at first

Question 31

On a fuel injected engine, where is the fuel injected?

Answer 31

intake port of the cylinder

Question 32

A turbocharger will increase:

Answer 32

volumetric efficiency

Question 33

What is the difference between upper deck pressure and manifold pressure on a turbocharged engine? Where would the pressures be measured?

Answer 33

Upper deck pressure = pressure in induction system at the discharge of compressor but before fuel metering device Manifold pressure = After the fuel metering device, just before the cylinders

Question 34

The waste gate of a turbocharger is actuated using__________ pressure

Answer 34

spring pressure

Question 35

As altitude increases, will the waste gate need to move more open or closed?

Answer 35

closed