Haltech E6M User Manual
Page 122
116
Pattern 1
The first pattern has trigger windows that are related to the cylinder number which they
precede and can be calculated using the following equation:
4
1))
-
Number
(Cylinder
-
cylinders
of
(Number
Pulses
of
Number
×
=
For Example: A 4 cylinder engine that is to be triggered by cylinder 2 would have a trigger
window as follows:
12
4
1))
-
(2
-
(4
Pulses
of
Number
=
×
=
Cyl. 4 Window
Cyl. 6 Window
Cyl. 1 Window
6-Cylinder Nissan Trigger 1
Pattern 2
The second pattern is similar to the first but instead of having different size trigger windows
for each cylinder it has pairs of trigger windows matching the two cylinders that are
approaching TDC together on opposite strokes (i.e. compression-combustion and exhaust-
induction). The first pair is not a true pair; the two windows differ by a number of home
pulses in size, all successive pairs are identical in trigger window size so a 4 cylinder engine
has one odd pair and one true pair