Spark Plugs
Chapter 2 Spark Plugs
20
U-groove
7
●
Making a U-shaped groove on the
inside of the ground electrode secures
the large volume required for flame
core formation and growth and makes
it possible to obtain large ignition
energy.
●
Since it is possible to reduce the
spark voltage without enlarging the
spark plug gap, superior ignition
performance is attained.
K16R-U11
Platinum ZU
8
●
This spark plug uses 0.7-mm
diameter ultra-fine special platinum
alloy for the center electrode to
improve sparking and uses a U-groove
and taper cut for the ground electrode
to improve ignition.
8
7
Platinum
1
1
1
1
W31ES-ZU