IGNITION SYSTEMS

Mr. Lombardi, Lombardo, Setter

DI and DIS

DI DIS

Distributor Ignition Distributorless Ignition

Distributor

Mechanical device which controls spark timing to the different cylinders through plug wires.

DI Components

Distributor Body Distributor Shaft Distributor Cap Rotor Pick-up Module Coil Distributor Gear Advance Mech

Distributor Body

Hollow aluminum housing that contains all the necessary parts like the shaft, pick-up, advance, rotor, etc…..

Distributor Shaft

The actual spinning part of the distributor

Connected to cam Spins pick-up Spins rotor

Distributor Cap

Molded plastic cap that covers the distributor and distributes electricity to the spark plugs via spark plug wires

Underside of Cap

Rotor

Mounts to shaft Conducts spark from

coil terminal to individual cap terminals

Pick-up Coil

The pick up coil's purpose is to create the pulses of the distributor

The pulses tell the ignition module when to fire the secondary coil.

Ignition Module

Amplifies and reshapes the pick-up coil wave

Coil

The Coil multiplies voltage from the battery

12V in 30,000V to 100,000V out

Distributor Gear

Usually driven off Camshaft

Advance Mechanisms

As RPM increases the combustion process must begin sooner

Two types of advance Mechanical/Centrifugal Vacuum

Mechanical/Centrifugal Advance

As RPM increases Centrifugal Force pushes weights outward advancing the timing

Vacuum Advance

In Ported Vacuum as vacuum increases so does timing. Increase RPM – Increase Vacuum

In Manifold Vacuum as vacuum decreases so does timing. Increase RPM – Decrease Vacuum

Spark plug wires

There are several different Wire types and Manufactures depending on the application

High Tension Ignition Wires There are three basic wire types

CARBON SUPPRESSION CONDUCTORS SOLID CORE CONDUCTOR WIRES "LOW-RESISTANCE" SPIRAL WIRES

Spark Plugs

Spark plugs come in different .. heat ranges Shapes Sizes

Chevy Runs deep