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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:
Instantaneous value: shown in ( )
n
Cylinder average value: cavg
n
FROM THE
HOME SCREEN
PRESS
F1
TO VIEW
NEXT
CYLINDER
PRESS
NEXT
TO VIEW
NEXT
CYLINDER
CPU-95EVS OI 7-13
All rights reserved © ALTRONIC, LLC 2013
TO VIEW
PRESS
F3
GRAPH OF
TO ADJUST
CURRENT
SPARK
CYLINDER
OFFSET
PRESS
ESC
TO
EXIT
PRESS
F1
TO VIEW
DISPLAY
SCREEN
F4
31
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