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11.0 UNDERSTANDING AND USING THE SECONDARY SPARK
DIAGNOSTICS
11.1. The spark reference number is a unitless number which correlates with voltage
demand at the spark plug and is calculated for every firing of each cylinder.
As the voltage increases, the reference number also increases. The number
is non-linear and will increase faster at higher voltages (above 20kV). The
usefulness of the number lies not in its absolute value, but rather in how the
number changes over time as the spark plugs erode. With a little experience,
the engine operator will be able to tell when spark plugs require changing.
Abnormal conditions in the ignition system, such as open or short circuits in
the primary and secondary wiring, can also be detected.
11.2 The reference “cylinder spark data” number can be viewed separately for each
ignition output (cylinder) in two ways, and compared to the average of the
entire engine:
n Instantaneous value: shown in ( )
n Cylinder average value: cavg
FROM THE PRESS
HOME SCREEN TO VIEW
DISPLAY
SCREEN
PRESS TO VIEW PRESS
TO VIEW GRAPH OF TO ADJUST
NEXT CURRENT SPARK
CYLINDER
F1
CYLINDER OFFSET
PRESS PRESS
TO VIEW TO
NEXT EXIT
CYLINDER
NEXT
ESC
F1
F3
F4
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