Basic Ignition Timing Control; Starting Ignition Timing Control - SELVA MARINE Kingfish 25 Service Manual

Basic ignition timing control

The ignition signals are output for the ignition timing that has been programmed according to the
engine speed.
Normally, the ignition timing is controlled so that it is between BTDC 6 degrees and BTDC 26
degrees.
In addition, this ignition timing is controlled when the engine is started, during acceleration, and
according to the engine cooling water temperature.
a
30
25
20
15
10
5
0
0 1000 1500
a Ignition timing (BTDC)
b Engine speed (r/min)

Starting ignition timing control

When the engine is started, the ignition timing is set to BTDC 10 degrees for 3 seconds.
Control-starting condition
Engine speed is 150 r/min or
more for 0.5 second
2000 2500 3000
Control time
3 seconds
Ignition control system
3500 4000 4500
Ignition timing
BTDC 10 degrees
b
5000 5500 6200
2-4
2