PISTON ENGINE PROPULSION

Chapter 6

Ignition Systems

1933 Alvis Engine

2014HyundaiEngine

IGNITION SYSTEMMagneto Operation

CoilCoil

Soft Iron Core

Secondary Windings

Primary Windings

Engine Driven Rotor and Magnets

IGNITION SYSTEM – Faraday Law

S NS NS NS NS NS NS NS N

Principal -

Each time the magnetic field ‘washes’ through wires

Volt Meter

An electrical current is produced

Called an EMF – Electro Motive Force

Coil Coil WindingsWindings

IGNITION SYSTEMMagneto Operation

The magnetic field passes through soft iron core

EMF produced in the coil windings

IGNITION SYSTEM

No magnetic field in soft iron core

No EMF produced in the coil windings

IGNITION SYSTEM

The magnetic field passes through soft iron core again

EMF produced in the coil windings again

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 – DistributorTypical Distributor

Centrifugal Advance

Diaphragm Adjustable Plate

‘Points’

Cam

Cap

Body

Input Shaft Centrifugal

Weights

Adjuster

Vacuum Chamber

Vacuum Advance

Inlet Pressure

IGNITION SYSTEM – Electronic Systems

Ignition Switch

Coil Packs

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 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

Any Questions?Any Questions?

IGNITION SYSTEM