70
What is the difference between
and ?
The , with its 0.4mm iridium center electrode and
U-groove
+
tapered cut ground electrode, is a high performance plug providing ultimate running results.
The , with its 0.4mm iridium center electrode and platinum
ground electrode, is a high performance plug with an emphasis on longer life.
What patented technologies are
used with ?
The 0.4mm ultra-fine iridium center electrode used in
is original technology from DENSO covered by the following patents.
The ground electrode of the
has a tapered cut and a U-shaped
groove on its underside, reducing the quenching effect during flame formation and
providing exceptional ignitability.
The ground electrode of the
has a platinum at the discharge point,
suppressing electrode wear at discharge and providing the working life of a platinum plug.
Tapered cut
U-groove
Platinum
■
Material composition of iridium
By adding a small amount of rhodium to the primary iridium
material, resistance to oxidation is increased and corrosion
in the high temperature combustion environment is
suppressed. Japan Patent 2877035, UK Patent 2302367,
US Patents 6094000, 6262522, People’s Republic of China
Patent 961022841, Republic of Korea Patent 0292083.
■
Manufacture of iridium
Rather than using the usual sintering method, a melting
method enables manufacture in any shape and dimension.
Japan Patent 3000955, US Patent 5977695.
■
Welding of iridium
“360
°
laser welding” melts the
entire circumference of the part
with a high energy laser to
maintain a fit state even under
harsh running conditions.
Japan Patent 2921524,
US Patent 6078129.
0.4mm iridium
0.4mm iridium
360
°
laser
welding
