Douwe EgbertsEgberts CAFITESSE 300, Руководство по обслуживанию

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53
Tell me about the required voltage in the
.
The required voltage is reduced by the use of the
ultra-fine 0.4 mm diameter center electrode.
Q
12
A
Good
10
15
20
25
(kV)
Required voltage
When started Idling Fast acceleration Full load driving
Normal spark plug
The required voltage in the is between 3 and 5 kv less
than in normal plugs.
Test engine: 660 cc, Carburetor, 3-cylinders
Recently, there has been a trend to increase the compression ratio to increase
output in engines. This means that the required voltage of spark plugs tends to
increase and high compression is required in highly tuned engines. When this
occurs, the required voltage increases and, in the worst case, sparking ceases
while the engine is running. Minimization of the electrode diameter is an effective
way of avoiding this. (Refer to the answer for
Q2
.)
In the , the center electrode has a diameter of 0.4 mm.
Because required voltage is kept low, this enables the to
be used in high performance engines and for high response driving.
The following graph gives examples of required voltage measurements for
and normal spark plugs.
(The above is analyzed in DENSO.)