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TM 9-8000
Figure 2-49. Figure 2-50. Increasing Compression Ratio.
Section V.
B  Measuring Ignition Timing (Fig. 2-51).
Ignition Timing.
The standard way to express the time when the
ignition spark occurs is by citing the respective
a. General. Ignition timing refers to the timing
crankshaft position in degrees. This position is
of the spark at the spark plug gap in relation to the
expressed in terms that use top dead center for the
position of the piston.


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