90
0.4mm Dia. Iridium, only at DENSO!
Overall Shape
Variety
Heat Range
Thread
Size
Intermediate Number
(Electrode Shape)
Intermediate Number
(Overall Size)
-
I
：Iridium
1
：Oblique ground
electrode or
surface gap plug
24
27
29
31
32
34
35
2
：Flat ground electrode
3
：Oblique ground
electrode and
resistor-less plug
U
XU
RE
RL
RT
W
WM
K
Q
A
AE
KH
：10mm
：12mm
：14mm
：14mm
：14mm
：14mm
：14mm
：14mm
：14mm
：14mm
：14mm
：14mm
R
：Surface Gap
(Exception) IRE01 has a flat ground electrode.
Identifying
(Stamped into the Center of the Housing)
The process used to join the iridium tip
is a highly reliable "360° Laser Welding
*1" process that is able to withstand
various kinds of driving conditions.
*1 This "360° Laser Welding" method has been
patented in the U.S.A. and Japan (Japan Patent
No.: 2921524, U.S.A. Patent No.: 6078129)
360° Laser Welding
Included with the plug comes with a
terminal nut compatible to the Nology
HotWire and most plug cords around the
world. Please remove for vehicle types
that do not require terminals. (There are
also types with fixed terminals. Refer to
the Cross Reference Chart on P22. )
(IRE01/ IW01 specify crimping, while
IWM01/ IK01/ IK02/ IQ01/ IQ02/ IA01/
IAE01 are solid terminals.)
Specification Includes Terminal
All
plugs
specify a resistor, and contain a highly
reliable monolithic-type resistor that
blocks noise that may affect electronic
devices. (IW06 has no resistor.)
Contains a Highly Reliable Resister
Using a bright nickel plating on the housing,
a high level of corrosion resistance has
been realized. Also, because the amount
on the threads is low, the damage to the
female thread in the cylinder is reduced.
Highly Corrosion Resistant, Bright Nickel Plating
5kΩ
During the start of the race, non-starting from carbon fouling
and carbon deposits can be fatal. To stop this, the insulator
has been coated with a silicone coating. Using the water
repellency of silicone, the insulator surface is isolated from
moisture and carbon, preventing a decrease in resistance.
To improve the tolerance to abnormal combustion conditions, the
housing end face chamfer has been enlarged. Be covered for slight
inaccuracies in tuning. Also, because the exhaust of residual gas and
the flow of new gas have been facilitated, its self-cleaning performance
has been improved, making this a carbon fouling resistant design.
Using a new, stronger insulator
developed repeating numerous race
trials, strength has been increased
by about 20%.
Between the center electrode and the insulator,
a small pocket has been opened around the tip
clearance. When there is carbon fouling or
deposition, this part will discharge and burn off
the carbon, restoring electrical resistance. This technology is
patented by DENSO (Japan Patent No. 2727558)
Compared to the nickel alloy used in
conventional spark plugs, the high
melting point of platinum will reduce such
problems as ground electrode melting
and wear. Also, the 0.8mm platinum
alloy is welded on and gapped without
any bending, reducing residual stress
and increasing durability.
<IAE01 has a 1.0mm square tip>
0.8mm All-Platinum Ground Electrode
Electrode Shape
The center electrode tip is able to be made fine using a new
iridium alloy with a high melting point. The required voltage
is reduced, and ignitability is improved greatly. This new
iridium alloy's material composition, manufacturing method
*1, and welding method *2 have been patented.
*1 The addition of rhodium to improve high temperature oxidation resistance:
Japan Patent 2877035, UK Patent 2302367, People's Republic of China
Patent 961022841, Republic of Korea Patent 0292083, U.S.A. Patent
6094000/6262522
*2 Using a melting method instead of the conventional sintering method.
Japan Patent 3000955, U.S.A. Patent 5977695
0.4mm Dia. Ultra-Fine
Iridium Center Electrode
0.4mm
IRIDIUM
Spark Cleaning Pocket
Housing End Face Chamfer
Silicone Oil Coating
Insulators for Racing
360° Laser
Welding
CROSS REFERENCE
FIGURE
ELECTRODE
TYPE
(HEAT RANGE□)
TYPE
※RU01-□ are surface gap plugs, not ones with iridium center electrode and all-platinum ground electrodes.
IU01-
□
U-E
●
1
■
A
R0373A, R0379A, R016
RU01-
□
※
U-E(SURFACE)
●
1
■
C
R0045J, R0045Q
IXU01-
□
XU-E
●
2
■
A
R216, R2525
IRE01-
□
ROTARY ENGINE
●
3
■
B
R6725
IW01-
□
W-E
●
4
■
A
R6385P, R7376, R6918B
IW06-
□
W-E(NON=RESISTOR)
●
4
■
A
B-EGP, R4630A
IWM01-
□ W-EM
●
5
■
A
R5184, R6179AP
IK01-
□
ISO(SLANT ELECT.)
●
6
■
A
R7116, R7117
IK02-
□
ISO(STRAIGHT ELECT.)
●
6
■
B
R7279, R7118, R7119
IQ01-
□
SLANT ELECT.
●
7
■
A
R7236, R7237
IQ02-
□
STRAIGHT ELECT.
●
7
■
B
R7238, R7239
IA01-
□
FOR DETONATION COUNTER
●
8
■
A
R7282A, R6120A
IAE01-
□
FOR W/OUT DETONATION COUNTER
●
9
■
A
R7282, R6120
IKH01-
□
K-LONG REACH
●
10
■
A
R7438
IRL01-
□
ROTARY ENGINE RX8
●
11
■
A
R7440A-L
IRT01-
□
ROTARY ENGINE RX8
●
12
■
A
R7440B-T
●
1
50
mm
●
2
51
mm
●
3
66
mm
●
4
56
mm
●
11
62
mm
●
12
62
mm
On Sale
Summer
2004
On Sale
Summer
2004
●
9
27.6
mm
19
mm
●
8
27.6
mm
22
mm
For Detonation
Counters
●
10
50.5
mm
26.5
mm
Iridium Racing is ideal for racing and tuned-up engines; please choose one based on the heat range of the standard plug or Iridium Power plugs used currently that is suited to your level of tuning.
●
6
50.5
mm
●
7
53
mm
●
5
47.3
mm
○Generally, electrodes that project into the combustion chamber have better ignitability and have better performance. However, because of more exposure to high temperature combustion
gases and because ground electrode becomes longer, heat resistance and durability decrease. The higher the level of tuning, the greater the need is to use a less projecting type.
○As the level of tuning is increased, so does the need for a higher heat range.
Warning: On choosing
the right racing plug
How To Choose a Racing Plug
■
B
■
C
■
A
■
E
■
D
Bright
Nickel
