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Iridium TT
The Iridium TT Twin Tip Technology delivers far less obstruction to the spark allowing an omni-directional explosion. This minimizes the quenching effect and results in a more effective, more complete combustion. Better combustion means more power and better fuel economy, as fuel is burned more efficiently with each piston firing. The large center and ground electrodes seen on a Standard Plug increases "quenching" of the explosion, meaning the spark explosion is restricted by the electrodes above and below the gap, allowing it to spread to either side, but not grow with full range.

  • The Iridium TT's two tips (a 0.4-mm Iridium center electrode, and a 0.7mm Platinum ground electrode) allow the spark plug to create the largest spark concentration and explosion.
  • Denso's patented Twin-Tip technology was first used on original equipment spark plugs for luxury and performance cars. Now that technology is available to everyone.
  • Denso selected Iridium and engineered it with Rhodium to build the most durable alloy for spark plugs. The patented formula has the highest concentration of Iridium of any spark plug and outperforms in the most severe engine temperatures resisting oxidation and voltage wear for over 100,000 miles.
  • Titanium-enhanced alloy ground electrode.
  • 1.1mm Platinum Center Electrode.
What's in it for you?
  • Improved Fuel Economy
  • Faster Starts
  • Enhanced flame propagation for increased engine efficiency
Why purchase the Iridium TT Spark Plug?

Spark Plug Type Performance Differences

Resistance5000 Ohms
Ground Electrode Tip DesignPlatinum Twin-Tip
Ground ConfigurationTwin-Tip
Ground Electrode Core MaterialNickel
Center Electrode Core MaterialCopper
Center Electrode Tip MaterialIridium Rhodium Alloy
Gap Size0.040"
Ground Electrode Quantity1
Hex Size16.0 mm
Manufacturer Heat Range20
Seat TypeTapered
Reach25.00 MM

DENSO Warranty Information:
12 months on A/C Evaporator Cores, A/C Compressors, A/C Compressor Clutches, A/C Condensers, Radiators, Fuel Injectors, Fuel Pumps, Fuel Tank Sending Units, Ignition Coils (COP), Alternators, Starters, and Mass Air Flow Sensors. Parts subject to normal wear and tear are not covered (Filters, Ignition Wires, Oxygen Sensors, Spark Plugs, Wiper Blades, etc.). IMPORTANT A/C COMPRESSOR WARRANTY NOTE: In order to ensure that proper warranty credit is issued if needed, the compressor installation instructions must be adhered to. All compressors returned for defect must show proof of purchase of an A/C Orifice Tube (or A/C Expansion Valve), A/C Receiver Drier/Accumulator, and A/C System Flush or a Work Order showing the purchase of these items and that the system was flushed.