Denso Iridium Spark Plugs ITV20 for Mk3 RS and ST250

Denso Iridium Spark Plugs ITV20TT for Mk3 RS and ST250

The ITV20TT is the same grade as the standard plugs.

DENSO has started to sell IRIDIUM TT spark plugs having a φ0.4 mm iridium alloy center electrode and a 0.7 mm needle-type platinum alloy ground electrode.

The quenching effect has been decreased by forming the electrode into a double needle shape. As a result, the flame kernel rapidly develops and the engine’s power is drawn out to its maximum potential.

❶ Built-in, Highly Reliable Resistor

All specification types include an embedded, highly reliable, monolithic resistor to eliminate electoromagnetic noise interference from all kinds of electronic devices.

❷ 360° Laser Welding

The iridium tip is mounted with an “All-around Laser Welding” method that insures high reliability even under the most severe driving conditions.

❸ φ0.7mm Needle-Shaped Platinum Ground Electrode

In order to maximally prevent quenching effect, the ground electrode needs to be made as small as possible. Traditional ground electrodes could not be made too small without reducing groundig strength or increasing electrode wear.
However, we’ve managed to attach a fine 0.7mm-diameter platinum electrode using a 360° laser welding technique.

❹ φ0.4mm Ultra-fine Iridium Center Electrode

Using DENSO’s exclusive iridium alloy having a very high melting point, the tip of the center electrode can be shaped very thin and fine, reducing spark voltage requirements and greatly improving ignitability.

Pregapped TO 1mm. These are gapped differently to normal plugs as they have the "double needle" electrodes.

*Please note images are generic and may not show the exact product*