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Automotive Ignition Systems Ignition System Purpose Create a high voltage spark Create a high voltage spark Deliver the spark at correct time Deliver.

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Presentation on theme: "Automotive Ignition Systems Ignition System Purpose Create a high voltage spark Create a high voltage spark Deliver the spark at correct time Deliver."— Presentation transcript:

1

2 Automotive Ignition Systems

3 Ignition System Purpose Create a high voltage spark Create a high voltage spark Deliver the spark at correct time Deliver the spark at correct time

4 H o w St uf f W or ks.c o m H o w St uf f W or ks.c o m

5 Ignition Timing BTDC BTDC ATDC ATDC Engine RPM Engine RPM Engine Load Engine Load Firing Order Firing Order Retard Retard Advance Advance

6 Firing Order

7 1,3,4,2 1,3,4,2 1,2,5,4,3,2 1,2,5,4,3,2 1,5,6,3,4,2,7,8 1,5,6,3,4,2,7,8

8 Firing Order

9 Ignition System Circuits Primary Circuit Primary Circuit (Low Voltage) (Low Voltage) Ignition Switch Ignition Switch Resistor Resistor Coil Primary Winding Coil Primary Winding Ignition Module Ignition Module Pick-up Assembly Pick-up Assembly Secondary Circuit (High Voltage) Coil Secondary Winding Coil Wire Distributor Cap & Rotor Plug Wires Spark Plugs

10 Ignition Primary Circuit Battery Battery Ignition Switch Ignition Switch Resistor Resistor Coil Winding Coil Winding Ignition Module Ignition Module Pick-up Assembly Pick-up Assembly Low voltage side Low voltage side

11 Ignition Coils Step-up transformer Primary winding Secondary winding Uses electro- magnetic induction to operate Magnetic field must be built up and then collapsed

12 Ignition Coil High Voltage wire High Voltage wire + Battery + Battery - ign module - ign module Primary Windings Primary Windings Secondary Windings Secondary Windings

13 Making & Breaking Fields

14 Ignition Modules Old Systems Used Breaker Points Old Systems Used Breaker Points Modules Contain a Switching Transistor Modules Contain a Switching Transistor Externally Mounted Externally Mounted Distributor Mounted Distributor Mounted

15 Ignition Pick-up Assemblies Can be mounted in one of five different locations: #1 Distributor #2 Vibration Damper #3 Flywheel #4 Crankshaft #5 Camshaft

16 Distributor A mechanical timing device A mechanical timing device Drives off engine camshaft Drives off engine camshaft Can controls both primary and secondary circuits Can controls both primary and secondary circuits May contain advance units May contain advance units

17 The Rotor at Work Rotates around to DISTRIBUTE voltage to each spark plug Rotates around to DISTRIBUTE voltage to each spark plug tuffworks.com/igni tion-system4.htm tuffworks.com/igni tion-system4.htm tuffworks.com/igni tion-system4.htm tuffworks.com/igni tion-system4.htm

18 Ignition Secondary Circuit Coil Winding Coil Wire Distributor Cap & Rotor Spark Plug Wire Spark Plug

19 Distributor Cap & Rotor Cap fits on top of the distributor housing Cap fits on top of the distributor housing Made of lexon plastic Made of lexon plastic Has an index mark for proper installation Has an index mark for proper installation Rotor fits on top of distributor shaft Rotor fits on top of distributor shaft Also is indexed Also is indexed

20 Spark Plug Wires Very high resistance wire 1000 ohms per inch Mostly insulation material Small conductor material Must follow firing order

21 Spark Plug Placement

22 Spark Plugs Shell w/threads Shell w/threads Ceramic insulator Ceramic insulator Center electrode Center electrode Side electrode Side electrode Plug gap Plug gap Heat range Heat range Plug designation Plug designation

23 Resistor Plugs

24 Heat Rages of Plugs The difference between a "hot" and a "cold" spark plug is in the shape of the ceramic tip. The difference between a "hot" and a "cold" spark plug is in the shape of the ceramtip. The carmaker will select the right-temperature plug for each car. Some cars with high-performance engines naturally generate more heat, so they need colder plugs. If the spark plug gets too hot, it could ignite the fuel before the spark fires; so it is important to stick with the right type of plug for your car.

25 Spark Plugs tell a story Normal Worn Lead ErossionInsulator Breakage Minor MeltingMelting Over HeatingHeating Carbon Fuel/Additive Deposits Lead Fouled Oil

26 Old Breaker Point Ignition Used 1920s mechanical switch in distributor build-up - collapse coil magnetic field Points wear out Must be replaced each year

27 Breaker Point (dwell angle)

28 Breaker Point Parts

29 Making & Collapsing field

30 Electronic Ignition with Distributor (HEI) 1970s 1970s Transistor in ignition module turns coil on/ off Transistor in ignition module turns coil on/ off Module mounted externally or in distributor Module mounted externally or in distributor Pick-up in distributor Pick-up in distributor

31 High Energy Ignition (HEI)

32 Trigger Wheel No Points No Points Rotating Reluctor Wheel Rotating Reluctor Wheel Fewer Tune-Ups Fewer Tune-Ups More Efficient More Efficient

33 Optical Trigger (Chrysler) Photo Electric Sensor Photo Electric Sensor (Photo = Light) (Photo = Light)

34 CKPS (crankshaft position sensor) Fewer Parts Fewer Parts No Points No Points No Distributor No Distributor No Rotor No Rotor Computer Controlled Computer Controlled More Efficient More Efficient

35 Crank Trigger Wheel

36 Direct Ignition No Distributor One Coil for Two Cylinders Waste Spark System One Plug Fires Backwards

37 Wasted Spark 1 st plug fires forward 1 st plug fires forward 2 nd fires backwards 2 nd fires backwards Sister cylinders Sister cylinders

38 Direct Ignition

39 Coil Over

40 Business End of the Ignition System Size Size Reach Reach Heat Range Heat Range Spark.Air Gap Spark.Air Gap

41 Ignition System Maintenance Replace Spark Plugs every 30,000mi/36mo Replace Spark Plugs every 30,000mi/36mo Inspect Cap and Rotor (replace if necessary) Inspect Cap and Rotor (replace if necessary) Inspect Spark Plug wires (replace if necessary) Inspect Spark Plug wires (replace if necessary) Check Firing Order Check Firing Order Check Ignition Timing (if necessary) Check Ignition Timing (if necessary)

42 Timing Engine Warm Engine Warm At Idle At Idle Defeat Advance Defeat Advance #1 Plug wire #1 Plug wire

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