Spark Plug NGK 3689 TR6IX

The NGK Iridium IX TR6IX high-performance spark plug (part number 3689) is engineered for enthusiasts and drivers seeking maximum engine performance. The fine 0.6 mm iridium center electrode provides exceptional ignitability and fast throttle response while reducing the voltage requirements of the ignition system. A key feature of this model is the tapered ground electrode, which minimizes the quenching effect and improves acceleration dynamics. Technical specifications: tapered seat (no gasket), 16 mm hex size, 14 mm thread with a 17.5 mm reach. The plug features high corrosion resistance due to its trivalent metal plating and effectively prevents carbon fouling. The TR6IX model is widely used in high-output engines, including many American vehicles (Ford, GM) and tuned Japanese units, ensuring stable operation under high-temperature conditions.