Ignition SystemsIgnition Systems

Or…..Or…..

How to be a bright sparkHow to be a bright spark

IGNITION SYSTEMIGNITION SYSTEM

Magneto OperationMagneto Operation

CoilCoil

Soft Iron Soft Iron CoreCore

Secondary Secondary WindingsWindings

Primary Primary WindingsWindings

Engine Engine Driven Rotor Driven Rotor and Magnetsand Magnets

S N

IGNITION SYSTEM – Faraday Law

S NS NS NS NS NS NS N

Principal -Principal -

Each time the magnetic field ‘washes’ through wiresEach time the magnetic field ‘washes’ through wires

Volt Volt MeterMeter

An electrical current is producedAn electrical current is produced

Called an EMF – Electro Motive ForceCalled an EMF – Electro Motive Force

Coil Coil WindingsWindings

IGNITION SYSTEMIGNITION SYSTEM

Magneto OperationMagneto Operation

The magnetic The magnetic field passes field passes through soft through soft iron coreiron core

EMF produced in EMF produced in the coil windingsthe coil windings

IGNITION SYSTEM

No magnetic No magnetic field in soft iron field in soft iron core core

No EMF produced No EMF produced in the coil windingsin the coil windings

IGNITION SYSTEM

The magnetic The magnetic field passes field passes through soft through soft iron core iron core againagain

EMF produced in EMF produced in the coil windings the coil windings againagain

IGNITION SYSTEM – Magneto System

Ignition Switch

Distribution

Contact Breaker

Coil

Magneto

Condenser

Power Generation

Spark GenerationMagneto Unit Rotor Arm

IGNITION SYSTEM – Dynamo/Alternator System

Dynamo/ Alternator

Distributor

Contact Breaker

Coil

Ignition Switch

Secondary Windings

Primary Windings

Condenser

Battery

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

Ignition Switch

Coil Packs

IGNITION SYSTEM – Electronic Systems

Control Unit

Timing SensorTiming

Disc

Engine Speed Sensing Unit

Alternator

Battery

IGNITION SYSTEM – Spark Plug

Cap Connector

Outer Casing

Hexagon

Ceramic Body

Copper Sealing Gasket

Outer Electrode

GapSecuring Thread

IGNITION SYSTEM – Spark Plug

Centre Electrode

These surfaces must be kept clean

Seal

Change Spark Plugs Change Spark Plugs at specified timesat specified times

Make sure the correct Make sure the correct Spark Plug is fittedSpark Plug is fitted

Cap Connector

Outer Casing

Hexagon

Ceramic Body

Copper Sealing Gasket

Outer Electrode

Securing Thread

Any Questions?Any Questions?