DENSO makes a spark plug for every personality – from 100,000 miles to 150+ mph!

Welcome back! Let’s continue our look at the world of DENSO’s spark plug innovation. This week: the TT Series.


DENSO invented TT Twin-Tip Technology to enable larger spark concentration and explosion, delivering more complete combustion, which translates to more superior fuel economy.

Platinum TT® “Twin Tip” spark plugs – these spark plugs help vehicles achieve better fuel economy while reducing carbon emissions, all while delivering exceptional durability. The key is the 1.1mm in diameter platinum center electrode and a titanium-enhanced ground electrode (hence the name “Twin Tip”). Together, these two highly durable precious metals increase performance while still maintaining plug life by providing a more powerful spark under a wide range of driving conditions.

In technical terms: These design features combine to offer better performance through reduced quenching, which results in a larger spark and faster flame propagation for a more complete combustion and maximized fuel efficiency.


  • 1.1mm Platinum center electrode
  • Titanium-enhanced ground electrode
  • 360-degree laser welding – DENSO developed a proprietary laser welding process to create the highest quality bond, ensuring structural support for the Platinum center electrode

Better mileage, more power and faster starts, all while reducing carbon emissions, are what places the Platinum TT Spark Plug heads above the competition.

Iridium TT® “Twin Tip” spark plugs – DENSO’s innovative Twin Tip design promotes the largest spark energy concentration and explosion, which translates into improved acceleration and economy. That makes them the ultimate spark plugs for power, economy and endurance.

Iridium TT plugs feature the world’s smallest 0.4mm Iridium electrode, which produces excellent ignitability, and that helps improve fuel economy while extending plug life to over 100,000 miles.

In technical terms: The Twin Tip design 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.


  • 0.4mm patented Iridium-Rhodium center electrode
  • 0.7mm Platinum ground electrode
  • 360 degree laser welding
Animated spark comparison
Standard Plug (left) vs. Iridium TT (right)

Twin-tip technology

DENSO Iridium TT spark plugs optimize power output like never before while delivering more complete combustion for superior fuel economy – and they are designed to last well beyond 100,000 miles – that is a winning combination!

That’s it for the TT spark plugs. Be sure to return next week as we jump into the High Performance Series…

Find out more about DENSO parts for your car