Spark Plugs
Chapter 3 Basics of Ignition
40
Example of
4-cylinder engine
ignition order
a) 1-3-4-2
b) 1-2-4-3
4 cylinders
Crankshaft position
Example of
6-cylinder engine
ignition order
a) 1-5-3-6-2-4
b) 1-4-2-6-3-5
6 cylinders
Crankshaft position
Example of
8-cylinder engine
ignition order
a) 1-8-6-2-7-3-4-5
b) 1-8-4-3-6-5-7-2
8 cylinders
Crankshaft position
5 Comprehensive Test
Comprehensive Test
From the following statements about ignition, select the incorrect one.
The winding ratio between the comparatively thick primary coil and the comparatively thin secondary coil is about 1:100.
1
The primary coil energized duration expressed as the distributor rotation angle is called the dwell angle.
2
When the primary coil current is switched Off, mutual electromotive induction power is generated in the secondary coil.
3
As the engine speed increases, the secondary voltage falls.
4
As the engine speed increases, the primary current falls.
5
4-cylinder engines ignite the cylinders in order from No. 1 to No. 4.
6
1
1
4
4
3
3
2
2
1
1
4
4
3
3
2
2
5
5
6
6
1
1
4
4
3
3
2
2
5
5
6
6
8
8
7
7
Answer on next page
