Ignition

1. Ignition Systems
Or…..
How to be a bright spark

2. IGNITION SYSTEM
IGNITION SYSTEM
Magneto Operation
Coil
Soft Iron
Core
Secondary
Windings
Primary
Windings
Engine
Driven Rotor
and Magnets

3. S N
IGNITION SYSTEM – Faraday Law
S N
S N
S N
S N
S N
S N
S N
Principal -
Each time the magnetic field ‘washes’ through wires
Volt
Meter
An electrical current is produced
Called an EMF – Electro Motive Force
Coil
Windings

4. IGNITION SYSTEM
IGNITION SYSTEM
Magneto Operation
The magnetic
field passes
through soft
iron core
EMF produced in
the coil windings

5. IGNITION SYSTEM
No magnetic
field in soft iron
core
No EMF produced
in the coil windings

6. IGNITION SYSTEM
The magnetic
field passes
through soft
iron core again
EMF produced in
the coil windings
again

7. IGNITION SYSTEM – Magneto System
Ignition
Switch
Distribution
Contact
Breaker
Coil
Magneto
Condenser
Power
Generation
Spark Generation
Magneto Unit Rotor Arm

8. IGNITION SYSTEM – Dynamo/Alternator System
Dynamo/
Alternator
Distributor
Contact
Breaker
Coil
Ignition
Switch
Secondary
Windings
Primary
Windings
Condenser
Battery

9. IGNITION SYSTEM – Distributor
Typical
Distributor
Centrifugal
Advance
Diaphragm Adjustable
Plate
‘Points’
Cam
Cap
Body
Input
Shaft Centrifugal
Weights
Adjuster
Vacuum
Chamber
Vacuum Advance
Inlet
Pressure

10. Ignition
Switch
Coil
Packs
IGNITION SYSTEM – Electronic Systems
Control Unit
Timing
Sensor
Timing
Disc
Engine Speed Sensing Unit
Alternator
Battery

11. IGNITION SYSTEM – Spark Plug
Cap Connector
Outer Casing
Hexagon
Ceramic Body
Copper Sealing Gasket
Outer
Electrode
Gap
Securing Thread

12. IGNITION SYSTEM – Spark Plug
Centre Electrode
These surfaces must be
kept clean
Seal
Change Spark Plugs
at specified times
Make sure the correct
Spark Plug is fitted
Cap Connector
Outer Casing
Hexagon
Ceramic Body
Copper Sealing Gasket
Outer
Electrode
Securing Thread

13. Any Questions?