Chapter 10 Ignition Systems Helpful Reading Chapter 10

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Chapter 10 Ignition Systems

Chapter 10 Ignition Systems

Helpful Reading • Chapter 10 • Pages 195 -201 (up to “Switches”) • Pages

Helpful Reading • Chapter 10 • Pages 195 -201 (up to “Switches”) • Pages 208 -211 (Battery Ignition Systems

Additional Helpful Reading • Chapter 4 “Fundamentals of Electricity, Magnetism, and Electronics” • Read

Additional Helpful Reading • Chapter 4 “Fundamentals of Electricity, Magnetism, and Electronics” • Read pages 73 -82 (up to “Switches”) • Pay particular attention to pages 80 and 81

Magneto • A magneto ignition system has no outside energy source • No battery

Magneto • A magneto ignition system has no outside energy source • No battery

Magnetism and Electricity • Key Point #1 • If a wire is moved past

Magnetism and Electricity • Key Point #1 • If a wire is moved past a magnet, the magnetic field is cut by the wire and current will flow in the wire • Source of current in primary windings of coil

Magnetism and Electricity • Key Point #2 • When electrons flow through a conductor,

Magnetism and Electricity • Key Point #2 • When electrons flow through a conductor, a magnetic field is developed around the conductor • Magnetic field developed around the primary windings

Magnetism and Electricity • Key Point #3 • Switch opens (shuts off) primary circuit

Magnetism and Electricity • Key Point #3 • Switch opens (shuts off) primary circuit so current stops • Current stops so magnetic field collapses • Collapses around secondary windings, as well, which are 100 times more than primary windings…increasing voltage

Coil • A “step-up” transformer • Increases the voltage

Coil • A “step-up” transformer • Increases the voltage

Coil • Two sets of wire windings • Primary • Secondary

Coil • Two sets of wire windings • Primary • Secondary

Coil • Primary windings are fewer in number • Heavy copper wire • Circuit

Coil • Primary windings are fewer in number • Heavy copper wire • Circuit opened and closed by a switch of some sort

Coil • Switches • Breaker points in older models • Solid state ignition since

Coil • Switches • Breaker points in older models • Solid state ignition since mid 1980’s • No breaker points

Coil • Secondary windings • Many more turns (windings) of wire (100 Xs more)

Coil • Secondary windings • Many more turns (windings) of wire (100 Xs more) • Very fine copper wire • Connects to spark plug

Spark Plug • The spark plug wire connects the secondary winding to the spark

Spark Plug • The spark plug wire connects the secondary winding to the spark plug • High Tension Lead

Spark Plug • Spark Plug • The center electrode of the spark plug carries

Spark Plug • Spark Plug • The center electrode of the spark plug carries the high voltage current to the spark plug gap

Coil • Auto coil has 20, 000 turns of fine copper wire in secondary

Coil • Auto coil has 20, 000 turns of fine copper wire in secondary windings • 200 turns in primary windings

Coil • 200 turns in primary windings • Current for primary winding circuit comes

Coil • 200 turns in primary windings • Current for primary winding circuit comes from the battery • Battery ignition system • NOT magneto ignition system

Battery • Recharge the battery by forcing DC (direct current) through the battery in

Battery • Recharge the battery by forcing DC (direct current) through the battery in the opposite direction it normally would flow.

Two-Cylinder Engines • Some have a “waste-spark” ignition system • Both plugs fire at

Two-Cylinder Engines • Some have a “waste-spark” ignition system • Both plugs fire at the same time even though one cylinder is near TDC of the exhaust stroke…a “wasted” spark

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