Iridium TT Spark Plug

The DENSO 4704 Iridium TT spark plug is engineered to deliver superior performance and an extended service life of over 100,000 miles. This plug incorporates DENSO's Twin-Tip (TT) technology, which combines a fine-wire iridium center electrode (0.4mm) with a platinum-tipped ground electrode (0.7mm). This unique configuration concentrates spark energy, leading to improvements in acceleration, fuel economy, and overall engine responsiveness. Constructed with DENSO's patented iridium alloy, known for its high concentration and durability, the Iridium TT spark plug offers exceptional longevity. The design minimizes spark interference and maximizes ignitability, contributing to better power and torque output. The plug features a 14mm thread diameter, 1.25mm thread pitch, and a gasket seat type with a 26.5mm reach. Its purified alumina powder insulator provides robust strength and effective thermal conductivity, while the five-rib design on the insulator prevents flashover. Additionally, machine-rolled threads are implemented to ensure hassle-free installation and removal without seizing or cross-threading. This DENSO Iridium TT spark plug meets stringent quality standards, including being 100% pre-fired to ensure optimal performance from the start. It also includes a copper-glass seal that creates a gas-tight bond between the center electrode and the insulator. The overall height is ISO standard, and it features a solid terminal type. For installation, recommended torque specifications are 26-30 lb. ft. for cast iron and 15-22 lb. ft. for aluminum engine blocks.