WS8 PRIMARY AND SECONDARY IGNITION PATTERNS

Make :: Toyota

Model:: 4A-FE

Ws8 Primary and Secondary Ignition Patterns.

• To check the primary voltage i connected the oscillescope to the negative side of the primary coil and the negative to the body of the engine.
• All the primary voltages are normal according to the specifications.
• Below are the specs.

Cyl1	Cyl2	Cyl3	Cyl4	Primary Ignition
244.5v	244.5 V	244V	244.2 V	Firing Voltage
27.8 V	22.2 V	27.8 V	25.9 V	Burn Voltage
1.65 ms	2.4 ms	2.3 ms	1.3 ms	Burn Time
4.4 ms	7 ms	6.8 ms	7 ms	Dwell Time

• The average Dwell period is shown on the graph below and we are going to measure this using "Micro seconds, or milliseconds".
• Firing time shows the .5 sec of time in the graph which is expectable under the specs for this engine..
• Firing voltage is the long string from the bottom, rite to the top. this is the voltage used to keep burning the fuel, mixture.
• Burn time shows how many seconds the mixture burnt for ,
• By obtaining these readings we can tell the small details in the ignition system.
• For example if the burn time is longer then it is ,then this shows us that this is happening because for a faulty spark plug, ignition coil, or there could be a high pressure in the fuel line, having these readings makes it easy to Narrow down the problems that could occur.,.

Afet a QUik rev of the engine i recorded the Secondary Voltage pattern shown in he graph below

Cyl1	Cyl2	Cyl3	Cyl4	Secondary Ignition
10	11	12	14.	Firing Voltage(KV)
0.52	0.51	0.48	0.46	Burn Time(ms)
1168	1168	1168	1168	Snap Acceleration

• All these readings of snap accelerations in the secondary ignition voltage are accurate and smiler with oneanother,
• In this reading it is easier to read the dwell time because it shows the next firing pattern,,
• The next ignition pattern is copied by the same pattern as the previous , this
• carries on.
• This shows what is happening inside the combustion chamber when the engine is running, (ignition pattern, coil working,and spark leads.

FOr then next experiment I shorted the 2nd spark pug wire to the engine with a jumper wire.

The readings are recorded in the table below.

Cyl1	Cyl2	Cyl3	Cyl4	Secondary Ignaition
8	24	9	9	Firing Voltage(KV)
1.00	0.02	0.28	0.40	Burn Time (ms)

• This reading clearly shows that in cylinder 1 .. it takes time for the spark to jump across therefore more burning time and firing voltage requierd.
• Reading of cylinder 2 is taken as a picture for closer observation.

• The burn voltage shoots higer as shown in the graph.
• The firing time takes a bit longer than usual as well.

For the next test I turned the engine off and attached a spark tester to another spark plug. and recorded the readings below.

Cyl1	Cyl2	Cyl3	Cyl4	Secondary Ignition With Spark Tester
7	16	6	9	Firing Voltage (KV)
6.40	6.16	7.04	5.65	Burn Time(ms )

The gap we put was between 5mm - 30mm,

• The reading clearly shows that it takes more firing voltage to fire the spark over to the other side.
• in comparison the burning time increases .
• below is a comperd picture of the jumping spark and the normal ones.
•