Post on 21-May-2020
Ignition Systems
Small Gasoline Engines:
Operation, Repair and
Maintenance
Ignition Systems:
The first phase of small gasoline theory
of operation.
Group of component parts which
delivers the spark to the spark plug at
the precise moment to fire the
compressed air-fuel mixture.
IGNITION SYSTEM
MAGNETO POWERED (MAGNETO IN FLYWHEEL)
BATTERY POWERED (12 VDC STORAGE BATTERY)
With Breaker- Points
Solid-State
Without Breaker-
Points
Solid-State
Without Breaker-
Points
With Breaker- Points
Magneto-Ignition Systems:
Induced electrical current originates from a rotating magnet.
There are two types of Ignition Systems:
– With Breaker-points
– With/out Breaker-points
Magneto-Ignition System with
Breaker-points
Contains 2 Circuits:
Primary:
– Breaker-points
– Condenser
Secondary:
– Spark Plug
– Spark Plug Wire
Magneto-Ignition Systems:
An understanding of each part of the
magneto-ignition system is required to
comprehend how the system delivers a
spark to the combustion chamber at eth
precise moment.
It will be most helpful to become familiar
with the general component parts.
Magneto-Ignition Systems:
Flywheel Magnet: Produces electrical energy
Magneto-Ignition Systems:
Armature: “Pick Up” of a magnetic field from a moving magnet, and assists the coil in “Building Up” a stronger magnetic field.
Two types:
Magneto-Ignition System
Solid-State Ignition System
Magneto-Ignition Systems:
Coil: Transformer that converts low
voltage to high voltage.
Magneto-Ignition Systems:
Breaker-points: Two contact surfaces
that open and close to control the flow
of electricity.
Magneto-Ignition Systems:
Condenser: A device that stores a
surge of electrical current for late
discharge.
Magneto-Ignition Systems:
Spark Plug
Spark gap
Center Electrode
Shell
Ground Electrode
Reach
Insulator
Terminal
Ignition Timing:
Is an aspect of small
gasoline operation
that is very crucial.
Is the point in the
crankshaft revolution
circle at which the
spark plug is fired.
A Complete Magneto System:
THE END