Secondary Ignition

Will need crossfire demo

11/2001 VHS Auto 2

11/2001 VHS Auto 3

Points close or transistorturns on. . .

Primary circuit is completecurrent flows

11/2001 VHS Auto 4

Magnetic field builds tosaturation

11/2001 VHS Auto 5

Points open or transistorturns off. . .

If using points, condenserabsorbs electrons until

points get all the way open

11/2001 VHS Auto 6

Magnetic field collapsesfrom primary winding. . .High voltage is inducedIn secondary winding

11/2001 VHS Auto 7

Yea, we have heard that enough times!

Now what does it do?

11/2001 VHS Auto 8

Secondary ignition Primary ignition’s job was to make

the high voltage Secondary ignition’s job is to get

the high voltage to push current to the right spark plug at the right time

11/2001 VHS Auto 9

High voltage pushesCurrent (less than 10 mA)

to spark plug throughsecondary circuit

11/2001 VHS Auto 10

Secondary ignition components

Coil secondary winding

Rotor Distributor cap Spark plug wires

including coil wire (high tension wires)

Spark plugs

Ignition Coil secondary winding

Positive TerminalLabeled: “+” “Batt”

Negative TerminalLabeled: “-” “Dist”

Secondary WindingConnects from –to center of coil

Has about 25,000windings StandardResistance is 8,500 to12,000 ohms

Can create approximately30,000 volts (30 KV)

11/2001 VHS Auto 12

Distributor caps

Electronic ignition Point type ignition

Can have maleOr female terminals

May have a vent

May have #1 marked

11/2001 VHS Auto 13

Distributor caps

Electronic ignition Point type ignition

May have a vent

Ridges areto increaseinsulation

11/2001 VHS Auto 14

Inspecting distributor cap Underside

Look for cracks Look for worn or missing center carbon

button Look for carbon tracks Look for build-up on terminals Look for moisture

Outside Look for corrosion on terminals

11/2001 VHS Auto 15

Carbon tracks (replace cap)

Don’t try to clean, will come right back

11/2001 VHS Auto 16

External corrosion

Prevent by usingDiaelectric grease

11/2001 VHS Auto 17

Internal corrosion

11/2001 VHS Auto 18

Missing carbon button

11/2001 VHS Auto 19

Arcing cap

11/2001 VHS Auto 20

Rotors

Connect to distributor shaft Can (should) only go on one

way Only touches distributor

cap carbon button Doesn't touch distributor cap

terminals Usually .060” to .100”

Some have resistor built in

11/2001 VHS Auto 21

How rotors should only go on one way

11/2001 VHS Auto 22

11/2001 VHS Auto 23

Inspect rotors for: Wearing thru on spring that

touches carbon button Signs of spark jumping thru to

bottom side Wearing away of tip

11/2001 VHS Auto 24

Spark jumping thru (hole burned in rotor)

11/2001 VHS Auto 25

Burnt off spring

11/2001 VHS Auto 26

Plug & Coil wires (high tension wires)

Come with Different amounts of insulation

7mm (point type) 8mm, 8.5mm, 10mm (electronic and

computerized ignition) Different kinds of cores

Carbon string (up to 7000 ohms per foot) Spiral wound (up to 1000 ohms per foot) Wire core (no resistance)

11/2001 VHS Auto 27

Removing wires

Grasp boot and twist and pull Do not pull on wire

Can use plug wire removing tool if there is room to get down under

11/2001 VHS Auto 28

Use factory routing of wires

Improper routing and separation can cause pre-ignition and holes in pistons

Wire separators

11/2001 VHS Auto 29

Firing orders that cause problems

GM’s & Chrysler

11/2001 VHS Auto 30

Demonstration of cross fire

31VHS Auto11/2001

11/2001 VHS Auto 32

Inspect wires for: Resistance Damage to insulation Damaged boots Signs of burning thru

insulation Corrosion to terminals Proper routing and

separation

11/2001 VHS Auto 33

Checking wire resistance

11/2001 VHS Auto 34

Checking boots

11/2001 VHS Auto 35

Proper routing and separation

11/2001 VHS Auto 36

Checking wire insulation under load Mist water onto plug wires with

spray bottle Load engine or give vacuum leak Look and listen for spark jumping

out of wires to common Works best at night

11/2001 VHS Auto 37

Spark plugs We will do later in a separate

presentation

11/2001 VHS Auto 38

Nissan’s dual coil set-upDual carbonbutton

Makes contact on dualLevel rotor $$$

11/2001 VHS Auto 39

Secondary ignition review High voltage, low amperage (up to

50,000v, .010a)

Requires excellent insulation Parts include

Secondary winding in coil Distributor cap Rotor High Tension wires Spark Plugs

11/2001 VHS Auto 40

Secondary ignition questions