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Iridium TT Twin Tip Technology







Ignitability That's a Cut Above

With DENSO's very own U-Groove ground electrode for better spark performance
To increase ignitability, the important point is to let the flame kernel caused by the spark to grow to a large size. Normally, this can be accomplishing by widening the spark gap, however this causes spark voltage to increase, which has the opposite effect. IRIDIUM POWER uses DENSO very own U-Groove ground electrode to realize a superb ignitability while maintaining spark voltage at low levels.


diagram


The Secret behind DENSO's Iridium Patent!

Plug electrodes conventionally have used nickel and platinum. These were not pure metals, but alloys containing other metals. Depending on the composition of the alloy, the matrix material's properties can be maximized. Using the same approach, iridium is alloyed with rhodium. The rhodium layer covers the iridium, improving the properties of the iridium. This iridium/rhodium technology was recognized by the Patent Offices of Japan and the UK, and in January 1999, a patent was granted in each respective country. (Patent Number - Japan: 2877035, UK: 2302367). Because DENSO had this patented technology, DENSO was able to make dia. of the iridium down to 0.4mm.
The most important things for plug performance are ignitability and sparkability. To make the electrode as fine as possible is the goal of spark plug manufacturers worldwide, and DENSO has taken the lead, succeeding the commercializing the 0.4mm dia. center electrode plug.


diagram
The finer the electrode, the more concentrated the electrical potential and the stronger the electrical field strength becomes, leading to a lower required voltage. This results in a steady combustion in a variety of driving conditions, and better starting and acceleration for the engine.


A Pattern from Spark to Ignition.

Electrodes have a quenching (cooling) affect (where the heat of the ignited flame kernel is taken away by the electrode). This cooling affect is greater with larger electrodes, sometimes causing the ignition to stop short of the stage in Figure 4. To improve ignitability, the contact area between the electrode and the flame kernel must be reduced. Improved ignitability is why IRIDIUM POWER electrodes have been made fine as possible.

diagram


Electrodes have a quenching (cooling) affect (where the heat of the ignited flame kernel is taken away by the electrode). This cooling affect is greater with larger electrodes, sometimes causing the ignition to stop short of the stage in Figure 4. To improve ignitability, the contact area between the electrode and the flame kernel must be reduced. Improved ignitability is why IRIDIUM POWER electrodes have been made fine as possible.


YOU ARE BUYING 100% GENUINE DENSO SPARK PLUGS

MANY SELLERS ARE SELLING COUNTERFEIT PLUGS

Comparison Between Genuine DENSO and Fake Spark Plugs

Comparison of DENSO and Fake
Appearance
DENSOFake
Terminal
Terminal has a glossy finish.
Marking
Printed wording can be scraped off.
Housing
Poor surface finish.
Screws & Electrode
Poor thread quality finish.
Section
DENSOFake
Ceramic Insulator
Poorly manufactured ceramic insulator with visible air bubbles trapped within witch affect heat dissipation capability.
Center Electrode
A genuine DENSO spark plug has a copper-core center electrode with excellent heat conductivity. A fake DENSO spark plug does not, retaining heat that causes meltdown.
Problems Caused by Fake Spark Plugs

Inconsistent sparking causes incomplete combustion. Unburned fuel from a black sooty deposit on the spark plug.eventually leading to poor fuel economy and poor start up of the engine.

Poor heat dissipation due to the lack of a copper-core center electrode causes pre-ignition. As a result, engine power drops under highway driving or uphill driving conditions.

Continued usage of an overheated plug will damage the electrodes.
Why Power Drops and Melting Occurs
DENSO
DENSO plug contains copper core
Quick heat dissipation.
Copper is an excellent heat conductor. High temperature heat is quickly dissipated away from the center-electrode to prevent melt down.
Fake
Fake plug is iron only
Slow heat dissipation.
Absence of copper-core center electrode result in poor heat dissipation capability. Prolonged use causes power loss due to excessive heat buildup. This result in melt down of the ground electrode, eventually leading to serious engine damage.

IRIDIUM POWER™ GAPPING TIPS

Before attempting to gap any DENSO Iridium Power spark plug, please review the specification chart in the front of this catalog to verify the factory-preset gap. In most cases your Iridium Power plugs do not need to be gapped. Even with small variations in the factory set gap the ultra-efficient firing power design will compensate for those small variations.
Should you decide to re-gap your Iridium Power plug, use extreme caution as improper gapping may damage or destroy the Iridium center electrode or porcelain center.
To increase the gap size:
  • Step 1: Use needle nose pliers or spark plug gapping tool to bend the ground strap up to the desired height. DO NOT LET THE PLIERS OR GAPPING TOOL TOUCH THE IRIDIUM CENTER ELECTRODE OR PORCELAIN.

  • Step 2: Re-check the gap with a calibrated gapping tool.


To decrease the gap size:
  • Step 1:Use the same method as above, however bend the ground strap down to the desired height. DO NOT LET THE PLIERS OR GAPPING TOOL TOUCH THE IRIDIUM CENTER ELECTRODE OR PORCELAIN.

  • Step 2: Re-check the gap with a calibrated gapping tool. WARNING: Failure to follow these directions may permanently damage the spark plug. Note: Never use a round gapping tool to check the gap or to increase or decrease the gap setting.

WARNING: Failure to follow these directions may permanently damage the spark plug. Note: Never use a round gapping tool to check the gap or to increase or decrease the gap setting.

Installation Key Points
  1. The threaded area of the cylinder head must be clean.
  2. Using your fingers, screw the spark plug into the cylinder head, and tighten about 1/4-1/2 turn with a plug wrench. (Taper seat plug: about 1/16 turn)
  3. Tightening too much may cause distortion of the plug housing, and in extreme cases could cause engine damage. Therefore, proper installation of the spark plug is important for life and performance of the spark plug.

Plug SizeCast Iron HeadsAluminum Heads
N*mlb-ftN*mlb-ft
10mm Flat Seat10-157-1110-157-11
12mm Flat Seat15-2511-1815-2511-18
14mm Flat Seat35-4026-3020-3015-22
14mm Taper Seat9-207-159-207-15
18mm Flat Seat43-5232-3838-4628-34
18mm Taper Seat20-2715-2020-2715-20

Note: The installation torque values shown above apply to new spark plugs without lubricating the threads. If threads are lubricated, the torque value should be reduced by approximately 1/2 to avoid over-tightening. 
* 1N*m = 0.1020 kgf*m 


Installation Procedure 

Whenever possible it is recommended that the spark plug should be installed by using a torque wrench. If a torque wrench is not available, tighten in the following manner. 

FLAT SEAT PLUGS
Finger TightFlat Seat


TAPER SEAT PLUGS
Finger TightTaper Seat

FAQ.



Q. Where does Iridium come from?
A. Fifty million years ago, an asteroid composed almost entirely of the precious metal Iridium (Ir-77) struck the earth, creating the Gulf of Mexico. The resulting dust cloud destroyed most living things and ended the dinosaurs reign on earth.Click here for more information.



Q. Why was Iridium not used until today?
A. The extreme strength of the metal inhibited its large-scale usage in spark plugs. However, through recent technological advances, DENSO has harnessed the power of Iridium. DENSO?s patented alloy is composed of iridium, complimented by rhodium (an even stronger metal). The rhodium is added to increase oxidation and wear resistance. DENSO was able to make this durable alloy workable by pioneering and patenting a Laser-Welding/process. This process provides a 360-degree weld so reliable that the electrode resists wear, even in the harshest conditions.



Q. What makes Iridium better?
A. Until recently, platinum was considered the best material to use on the top of an electrode because of its durability. However, Iridium is 6 times harder, 8 times stronger, and has a melting point 1200 degrees higher than platinum. Put that into a harsh environment such as an engine piston chamber, and you have a spark plug that can resist wear much better than platinum. Additionally, the DENSO Iridium Power alloy is so durable; it allowed our engineers to produce the world?s smallest center electrode (.4mm) which reduces the voltage requirements, concentrating its sparking power. Also, its smaller size, combined with the tapered U-Groove ground electrode, allows more room for the flame kernel to develop and produce a more efficient combustion.



Q. How long will Iridium Last?
A. Iridium use represents the most significant technological advance in automotive spark plug manufacturing, since platinum was introduced in the early eighties. As vehicle manufacturers produce increasingly complex and efficient automobiles, there is a greater need for long-life plugs that can tolerate leaner fuel mixtures and improved combustion processes. DENSO has responded to this need by developing its Iridium alloy, originally for OE applications. For example, many newer Lexus? and Toyota models carry an ultra long-life Iridium plug variation (.7mm with platinum tipped ground) that is capable of up to 120,000 miles of service. DENSO Iridium Power plugs, with their .4mm center electrode, have been developed for performance applications. Because gradual wear will ?round-off? firing points over time, the concentrated firing power andvoltage requirement benefits will be reduced. For this reason, DENSO advises replacement after 30,000 miles.



Q. Why is the U-Groove special?
A. The patented U-Groove allows the flame kernel to fill the gap formed by the U. This ball of fire develops a larger and hotter flash front a complete combustion. The flat ground electrode design of ordinary spark plugs crush the spark, inhibiting its growth; this effect is known as a ?quenching effect.? The simple, but efficient, U-Groove feature results in better fuel efficiency, improved throttle response, and greater firing energy.



Q. Why are there different heat ranges? Which one should I use?
A. Part of your spark plug?s responsibilities, in addition to firing a spark, is to remove heat from the combustion chamber. This is accomplished by channeling the heat through the insulator material and metal housing. From there, the heat is transferred to the cylinder head where the engine cooling system can go to work. A spark plug?s heat range is its ability to dissipate heat. The ?colder? the plug, the more heat it can channel out of the combustion chamber. In a performance application, colder heat ranges may be necessary to handle the extreme temperatures brought on by higher compression ratios, forced induction, and high RPM?s. While ?Colder? plugs may seem to be the way to go, please remember that the spark plug must achieve its ?self-cleaning? temperature where it can burn off fuel and carbon deposits. Otherwise, the plug could ?foul out? where it is prone to misfiring and poor acceleration. A plug that is too ?hot? can overheat, also causing power loss, detonation, pre-ignition, and possible engine damage. A good, general rule of thumb is to start with the factory recommended heat range. For every 75 to 100 hp you add to your engine, you may go to the next colder step. DENSO heat ranges move up as they get colder; 16 would be our hottest Iridium Power plug, 34 would be our coldest (ranges; 16,20,22,24,27,31,34)



Q. What torque recommendations do you give for the Iridium plugs?
A. Improper installation may cause poor performance and could result in costly engine damage. Click here for a table listing torque recommendations for the DENSO Iridium Power spark plugs.



Q. Do I need to set the gap?
A. Generally, no. The DENSO Iridium Power plug comes pre-set with a protective sleeve over the firing end, to protect the gap from accidental alteration. DENSO Iridium Power?s ultra-efficient firing power compensates for normally recommendedgap settings that are smaller than the pre-set value. In the cases of vehicle modifications (nitrous, turbo-chargers, super-chargers, high power ignition systems, etc.), some adjustments may be desired. Or, if you prefer to remain consistent with factory specifications, you may adjust. However, please be careful not to place any stress on the fine center electrode during adjustment. You could accidentally break off the very hard, and therefore brittle, tip. 



Q. What vehicle applications are covered?
A. DENSO Iridium Power spark plugs were initially introduced for popular import applications such as Toyota, Honda, Acura, Mitsubishi, and others. However, since our product launch, we have added spark plugs that fit popular ?Big Three? makes such as General Motors, Ford, and Chrysler. Currently, DENSO Iridium Power offers nearly full coverage for all passenger cars, light trucks, and vans. Soon, we will be launching plugs that will fit most motorcycle and powersports applications. 



Q. What kind of performance will I get from this plug?
A. Generally, you do not purchase spark plugs for performance enhancement. While DENSO Iridium Power spark plugs have contributed to numerous accomplishments through dyno-testing and actual use, their true benefit lies in their efficiency, durability, and improved firing power. Serious tuners modify their vehicles by increasing boost through turbo-chargers, super-chargers, and Nitrous. They are also known to add high-energy ignition systems, tinker with timing, adjust fuel mixture ratios, and increase horsepower through other means. Putting these kinds of demands on their engine increases the need for an efficient, durable spark plug that can handle these kind of harsh environments. That?s where DENSO Iridium Power can make a major difference. 



Q. Where can I buy DENSO Iridium Power Spark Plugs?
A. Click here to find a dealer in your area.



Q. What kind of testing has been done?
A. Iridium Power has been tested in many arenas. The most common area of testing has been on the track. There are currently many people using the plugs in import drag racing, with results being quite favorable. Some racers have seen E.T.?s decrease by a tenth and less fuel consumption during a pass. Circle track racers using the plugs notice better acceleration coming out of corners and more consistent idling. The other area where the plugs have been tested are on good old dynos. The results have indicated horsepower increases over stock plugs of 2-3 Hp in a naturally aspirated engine and 27 Hp in a supercharged/turbocharged engine as seen in the January 2003 issue of 5.0 Mustang & Super Fords magazine*. 

*Copies of 5.0 magazine article and/or various applicable dynographs are available from DENSO upon request. 



Q. I?m still not sure about DENSO Iridium Power Spark Plugs. I would like to ask a question. Who can I talk to?
A. Click to Contact Us. Or, you can call our technical department or send your question via our contact form. We will respond to your question shortly.



Q. How do I gap Iridium plugs
A. Before attempting to gap any DENSO Iridium Power spark plug, please review the specification chart to see the factory-preset gap. In most cases your Iridium Power plugs do not need to be gapped. Even with small variations in the factory set gap the ultra-efficient firing power design will compensate for those small variations. Should you decide to re-gap your Iridium Power plug, use extreme caution as improper gapping may damage or destroy the Iridium center electrode or porcelain center. To increase the gap size: Step 1 Use needle nose pliers or spark plug gapping tool to bend the ground strap up to the desired height. DO NOT LET THE PLIERS OR GAPPING TOOL TOUCH THE IRIDIUM CENTER ELECTRODE OR PORCELAIN. Step 2 Re-check the gap with a calibrated gapping tool. To decrease the gap size: Step 1 Use the same method as above, however bend the ground strap down to the desired height. DO NOT LET THE PLIERS OR GAPPING TOOL TOUCH THE IRIDIUM CENTER ELECTRODE OR PORCELAIN. Step 2 Re-check the gap with a calibrated gapping tool. WARNING: Failure to follow these directions may permanently damage the spark plug. Note: Never use a round gapping tool to check the gap or to increase or decrease the gap setting. 


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