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CONTENTS
Find Your Plugs
Reference
Part Number Chart
IRIDIUM POWER
Features
Structure
Linenup
Specifications
IRIDIUM TOUGH
Features
Structure
Linenup
Specifications
IRIDIUM PLUS
Features
Specifications
IRIDIUM POWER
Features
Structure
Linenup
Specifications
Basic_Knowledge
Plugs Configrations
 Plugs Specifications
Q & A
IRIDIUM POWER Q&A
IRIDIUM TOUGH Q&A
TECH Q&A
 Sales Companies
Cross Reference
World’s Smallest Diameter

This product, the first in the world, uses 0.4mm iridium alloy center electrode.
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.
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 0.4mm center electrode that keeps the required voltage low, it can be said that the IRIDIUM PLUS, is a car-friendly spark plug.
Platinum Tip

Using a platinum-tipped ground electrode to realize high-performance operation and long life.
A Platinium tip was used, which has a long history of use in platinum plugs. By signigicantly controlling electrode wear, we've achieved a level of durability equal to that of platiunum plugs.
High Strength Insulator

Using a high-strength insulator specially designed for taxis.
By using a high-strength ceramic insulator for LPG engines, a 20% increase in strength was achieved over conventional insulators.
Improved Mileage

Less fuel consumption with a 0.4mm diameter center electrode.
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.
diagram
Improved Acceleration

Through steady ignitability, acceleration performance is greatly improved.
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
diagram *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.
*The data shown is from internal
studies. Also, the "Regular Plug"
and "Platinum Plug" referred to
here are DENSO products.
Excellent Durability

Realizing astounding life and durability with platinum ground electrodes.
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.
Durability Comparison
diagram *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’s ignition system.)
*Recommended time before replacement is not something that must be followed to guarantee quality.
*The data shown is from internal studies. Also, the "Regular Plug" and "Platinum Plug" referred to here are DENSO products.


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