Difference between Battery Ignition System and Magneto Ignition System in SI Engine

battery vs magneto ignition

🔗Working of Battery ignition system, advantages and disadvantages
🔗Magneto ignition system construction, working, applications, advantages and limitations

Comparison between battery ignition system and magneto ignition system
Battery Ignition System
Magneto Ignition System
Current required for spark or primary is circuit is obtained from a battery.
It produces the electricity required for spark plug or primary with its own electric generator.

This type of ignition system Battery is a necessary component.
Magneto ignition system does not need a battery.

The problem of discharged battery.
Since it does not require a battery there is no problem of discharged battery.

It is heavy and requires more space than a Magneto type.
 It occupies less space when compared to battery type.

Quality of spark does not depend on the engine speed.
The quality of spark depends on the engine speed.

Good quality spark is obtained at low speed.
At low speed or at starting the quality of spark is poor because the generator produces less energy than required.

At high speed, the spark intensity reduces, and hence the efficiency of system decreases.
As speed increases the spark intensity also increases. It improves the efficiency of the system.

Since this system contains battery it requires high maintenance.
Less maintenance is required when compared to battery type.

It finds application in SI engines of cars and light commercial vehicle.
They are mainly used in racing cars and two-wheelers.

Magneto Ignition System Construction, Working, Applications, Advantages and Limitations

schematic magneto ignition system

Working of magneto ignition system

Working Magneto ignition similar to the battery ignition system except in the source of energy for operation. The magneto ignition system has its own generator (magneto) to supply necessary energy for the system. There are three types of magnet ignition system

  • Rotating magnet
  • Rotating armature
  • Polar inductor type

Advantages of 12V Ignition System over 6V Battery Ignition

battery cells voltage comparison in ignition system

🔗Coil ignition system construction and essential components
🔗Difference between battery ignition system and magneto ignition system

12V battery ignition versus 6V battery ignition

Until the 1950s the motor vehicle used 6V ignition system since it requires only three cell (of 2V) battery to create 6 Volts system. They are lighter than the 12V battery of same watt-hour capacity. As compression ratio and engine speed increased, the voltage requires to satisfactory ignition of the engine is also increased.

Battery Ignition System/ Coil Ignition System Working, Advantages and Disadvantages

Battery ignition system

Read: Battery ignition system construction and essential components

The main components of a battery ignition system are battery, ignition switch, ballast resistor, ignition coil, contact breaker, capacitor, distributor and spark plug. The source of high voltage/energy for the spark plug is the ignition coil, hence it is also called ignition coil system. Following figure shows a diagram of a conventional battery ignition system.

Battery Ignition System/ Coil Ignition System Construction and Essential Components

Car_ignition_system battery

🔗Difference between battery ignition system and magneto ignition system

Battery ignition is the most common type of ignition system. Since ignition coil plays a major role in this system, it is also called Coil Ignition System. They are used in cars, light trucks and in some two-wheelers. The above figure shows a battery ignition system for four-cylinder petrol engine.

Introduction Ignition Systems of SI Engine, What Are the Requirements of an Ignition System?

SI engine ignition

SI engine ignition systems

In a CI engine, air-fuel mixture gets ignited at a high compression ratio. But in an SI engine, it is not the case. The SI engine works the pressure ratio lower than that of CI engine. The SI engine requires an external source of an energy to initiate the combustion process. Engine ignition systems are the tools that used to ignite SI engine.