R
R
Econo
mical
A larger center electrode means a greater cooling effect and poorer ignitability. On
the other hand, the 0.4mm diameter iridium center electrodes have an extremely
small cooling effect, reducing non-firing and realizing assured ignitability, the basic
function of a spark plug.
Iridium Plus (Model: VK20T)
Normal Plug (Model: K16R-U11)
2.5mm Diameter
Center Electrode
Also, because taxis use liquefied petroleum gas (LPG) as fuel, a large electrode increases
the required voltage, and because this places a larger load on high tension cords and
coils, it affects the life of the vehicle. With its ultra-thin 0.4mm center electrode that keeps
the required voltage low, it can be said that the Iridium Plus, is a car-friendly spark plug.
World's Smallest Diameter
This product, the first in the world, uses an
ultra-thin 0.4mm iridium alloy center electrode.
A platinum tip was used, which has a long history of use in platinum
plugs. By significantly controlling electrode wear, we've achieved a
level of durability equal to that of platinum plugs.
Platinum Tip
Using a platinum-tipped ground electrode to
realize high-performance operation and long life.
Even during idling, when it is easy for ignition to degrade, Iridium Plus
reduces mis-sparking and stabilizes idling speed. This results in a
quieter engine and improved fuel consumption.
Normal Plug
(2.5mm Diameter)
Mileage(km/L)
１
５.７６
０
１
５.２３１
Platinum Plug
(1.1mm Diameter)
１
５.６
４６
Fuel Consumption Comparison
*Vehicle: 2000cc, 6 cyl., 4-cycle
Driving conditions: 60km/h on flat ground
*The data shown is from internal studies. Also, the "Regular Plug" referred to here is a DENSO product.
0 15.2 15.4 15.6 15.8
Improved Mileage
Less fuel consumption with a 0.4mm diameter center electrode.
Iridium Plus, through its 0.4mm diameter iridium center electrode, has realized high ignition performance
and low spark voltage at levels heretofore unseen. Because of this, there is less non-firing under high
spark voltage conditions and fewer misfires under conditions where ignition is difficult, permitting operation
with a high level of response under a variety of conditions. As a result, acceleration has been improved.
■Acceleration comparison
Speed (km/h)
*The data shown is from internal
studies. Also, the "Regular Plug"
and "Platinum Plug" referred to
here are DENSO products.
150
100
50
0
0.23 sec. difference
0.70 sec. difference
Platinum Plug
Regular Plug
T i m e
*Vehicle: 250cc
(2 cycle water cooled, V2 cylinders)
Conditions: Locked in 6th gear, starting at 50km/h on
an automatic test device and accelerating at full throttle.
Improved Acceleration
Through steady ignitability, acceleration performance is greatly improved.
By welding a platinum tip to the ground electrode, wear has been controlled to
a significant extent in the Iridium Plus. In addition to acceleration performance,
the life and durability of this plug has been increased to that of a platinum plug.
*The data shown is from internal studies. Also, the "Regular Plug" and "Platinum Plug" referred to here are DENSO products.
■Durability Comparison
Recommended time before replacement (X10,000km)
10
10
2
Platinum Plug
Regular Plug
10
5
0
*From taxi monitoring test results. Exhaust
volume was for the most part 2000cc.
*Durability will differ depending on the
driving conditions.
*The service lifetime of Iridium Plus will
depend on operating conditions and the
vehicle it is installed on. (Service lifetime
may become shorter depending on the
vehicleﾕs ignition system.)
*Recommended time before replacement
is not something that must be followed to
guarantee quality.
Mark II; Chaser;
Cresta
Make
Vehicle
CC
Engine
From Till
OEM Plug
Genuine Part No.
QTY
Toyota
Crown/ Majesta
2000 1G-GP（LPG）
91.10 01.2 90919-01180
VK20T
6
Toyota
Crown/ Majesta
2000 3Y-PE（LPG）
89.8
90919-01147
VW20T
4
Toyota
Crown Comfort
2000 1G-GPE（LPG） 95.12
90919-01180
VK20T
6
Toyota
Crown Comfort
2000 3Y-PE（LPG）
95.12
90919-01147
VW20T
4
Toyota
Corona
1800 2Y-PU（LPG）
82.10 01.11 90919-01143
VW20T
4
Toyota
Comfort
2000 3Y-PE（LPG）
95.12
90919-01147
VW20T
4
Toyota
Probox
1500 1NZ-FNE（CNG） 03.4
90919-01190
VK20T
4
Toyota
2000 3Y-P/-PU（LPG） 86.8 95.12 90919-01143
VW20T
4
Nissan
Crew
2000 NA20P（LPG）
93.7
―
VW20T
4
Nissan
Cedric; Gloria
2000 RB20P（LPG）
89.6
―
VK20T
6
Nissan
Cedric; Gloria
2000 NA20P（LPG）
91.6
―
VW20T
4
Nissan
Bluebird
1800 Z18P（LPG）
79.2 01.8 ―
VW20T
8
Mazda
Custom Cab
2000 FE（LPG）
89.6 96.1 FE82 18 110
VW20T
4
Mazda
Luce; Cosmo
2000 FE（LPG）
86.9 96.1 FE82 18 110
VW20T
4
Mitsubishi
1800 4G93（LPG）
96.1
MS851738
VK20T
4
Mitsubishi
Debonair
3000 6G72（LPG）
92.10
MS851473
VW20T
6
Galant Sigma;
Eterna Sigma
The above are excerpted from the catalog. Please refer to Master Catalog for details.
Excellent Durability
Realizing astounding life and durability with platinum ground electrodes.
Platinum Tipped Ground Electrode
0.4mm Diameter Ultra-Fine
Iridium Alloy Center Electrode
0.4mm
IRIDIUM
By using a high-strength ceramic insulator for LPG engines, a 20%
increase in strength was achieved over conventional insulators.
High Strength Insulator
Using a high-strength insulator
specially designed for taxis.
Designated part numbers and the associated vehicle models
Next Generation High Performance Plugs for Taxi
88
