55
In many cases, fuel consumption is improved.
When
spark plugs are used, accidental fire and misfiring rarely
occur under various driving conditions. Therefore, combustion is extremely good. In
turn, a healthy engine can be maintained and fuel consumption is improved.
In the idling examples given in the answer to
Q13
, combustion improved and therefore
the revolution count increased. However, if the engine’s idling revolution control is
operated, control that returns an increased revolution count will be operated and the
throttle constricted, thus improving fuel consumption during idling.
The following graph is the comparison of fuel consumption during idling.
Spark plug
Center electrode
(mm)
Normal plugs
Fuel consumption
（
/h
）
φ0.4
φ2.5
0.53
0.54
0.57
0.55
0.56
Good
Spark plug
Center electrode
(mm)
Normal plugs
Fuel consumption
（
/h
）
φ0.4
φ2.5
2.23
2.24
2.27
2.25
2.26
Good
What happens to fuel consumption when
is used?
Q
14
A
In many cases, fuel consumption will also improve for the same reason during
actual running.
The following graph is an example that shows an improved fuel consumption
when a car is being driven at 60 km/h on flat ground.
Test engine: 1600 cc 4-valve 4-cylinder
Test engine: 1600 cc 4-valve 4-cylinder
(The above is analyzed in DENSO.)
(The above is analyzed in DENSO.)
