Launch X431 Scopebox - Page 19

LAUNCH X431 PAD Scopebox User’s Manual
17
Four-stroke in-line four-cylinder: 1—2—4—3, or 1—3—4—2
Four-stroke in-line six-cylinder: 1—5—3—6—2—4, or 1—4—2—6—3—5
Four-stroke in-line eight-cylinder: 1—8—4—3—6—5—7—2
Five-cylinder: 1-2-4-5-3
V 6 engine: generally speaking, based on the person sitting on the driver cab,
if the right side
cylinder numbers on the right side, from the front to the back
are as follows: 1, 3, 5; and the cylinder numbers on the left side, from the front
to the back are as follows: 2, 4, 6; then the ignition sequence is: 1－4－5－2－
3－6. If the cylinder numbers on the right side, from the front to the back are as
follows: 2, 4, 6; and cylinder numbers on the left side, from the front to the back
are as follows:1, 3, 5; then the ignition sequence is: 1－6－5－4－3－2.
The Figure 4-1 below shows the normal ignition waveform of distributor ignition
s
y
stem, the upper one is the secondary waveform, and the lower one is the
primary waveform.
The secondary waveform
A section is contact open period; B section is make contact period, which is the
magnetizing field of ignition coil.