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What type of spark plug is the
?
This is a new generation of high-performance spark
plug that uses the world’s smallest
(*1)
iridium center
electrode that is a mere 0.4 mm in diameter.
Q
1
A
■
Tapered Cut
■
U-Groove
A U-groove has been cut inside the ground electrode
to maintain the large volume of space required to
form the nucleus of a flame.
While still keeping the required voltage low, this
technology enables excellent firing performance
without increasing the spark gap.
■
Ultra-fine 0.4 mm diameter iridium
electrode
Use of a “new iridium alloy” that has a high melting
point has enabled miniaturization of the center
electrode. Required voltage has been lowered and
firing performance improved.
(All types): Japan (2877035, 2921524, 3000955),
U.K. (2302367), U.S.A. (5977695, 6078129, 6093071,
6094000, 6262522), People's Republic of China
(961022841), Republic of Korea (0292083)
■
Highly corrosion-resistant
(*2)
bright nickel plating
Bright nickel plating, as used in racing car
spark plugs, is used in the housing to give
the plug high resistance against corrosion.
The tip of the ground electrode has been cut
to form a taper. This greatly improves firing
performance by reducing quenching.
*1: As of Nov. 1999, this excludes flush type electrodes that do not
protrude from the insulator.
*2: Excluding some types
