{"product_id":"denso-iridium-tt-spark-plugs-ikh16tt-4-pack-twin-tip-iridium-long-life-crisp-ignition","title":"Denso Iridium TT Spark Plugs IKH16TT 4-Pack — Twin-Tip Iridium, Long Life \u0026 Crisp Ignition","description":"\u003cp\u003e\u003cstrong\u003eDenso IKH16TT Iridium TT spark plugs pair a 0.4mm iridium center electrode with a 0.7mm needle ground tip to deliver longer life, sharper ignitions, and improved throttle response.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese Denso Iridium TT plugs combine precision metallurgy and advanced manufacturing for reliable ignition across tens of thousands of miles. Built with Denso’s high-iridium alloy and 360-degree laser welding, the IKH16TT is engineered to resist wear while focusing spark energy where it matters. The Twin-Tip (TT) design concentrates the spark to improve ignitability, potentially helping optimize fuel use and throttle feel without changing your engine’s tuning.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the Twin-Tip design affect starting and acceleration?\u003c\/h3\u003e\n\u003cp\u003eThe Twin-Tip configuration funnels spark energy between a fine iridium center and a needle-like ground electrode so combustion starts more reliably and cleanly. Drivers often notice crisper throttle response and steadier acceleration because each ignition event is more concentrated.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e0.4mm iridium center electrode for precise spark initiation\u003c\/li\u003e\n  \u003cli\u003e0.7mm needle ground electrode to minimize spark scatter\u003c\/li\u003e\n  \u003cli\u003eSharper ignition helps reduce misfires at startup and under load\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes these plugs last over 100,000 miles?\u003c\/h3\u003e\n\u003cp\u003eDenso’s patented iridium alloy and laser-welded construction resist electrode erosion and maintain a consistent gap for far longer than conventional plugs. Combined with a copper-glass seal and purified alumina insulator, the IKH16TT keeps its integrity under high heat and repeated combustion cycles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigh-iridium concentration for superior hardness and wear resistance\u003c\/li\u003e\n  \u003cli\u003e360-degree laser welding secures the electrode to the core\u003c\/li\u003e\n  \u003cli\u003ePurified alumina insulator improves thermal durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre they easy to install and reliable over time?\u003c\/h3\u003e\n\u003cp\u003eDenso trims common installation issues by using machine-rolled threads and factory pre-firing so plugs fit smoothly and perform consistently out of the box. Five ribs on the insulator reduce flashover risk, while the copper-glass seal maintains a gas-tight connection between electrode and insulator.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMachine-rolled threads reduce cross-threading during installation\u003c\/li\u003e\n  \u003cli\u003e100% pre-fired for consistent quality and immediate use\u003c\/li\u003e\n  \u003cli\u003eFive-rib insulator prevents flashover and stray current paths\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these plugs help with fuel economy and emissions?\u003c\/h3\u003e\n\u003cp\u003eBy improving ignitability and reducing misfires, the IKH16TT can contribute to more complete combustion events. While exact savings vary by vehicle and driving habits, a cleaner, more consistent burn tends to support smoother operation and can help your engine run nearer to its designed efficiency.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConcentrated sparks promote fuller combustion of the air-fuel mixture\u003c\/li\u003e\n  \u003cli\u003eReduced electrode wear preserves optimal gap and ignition timing\u003c\/li\u003e\n  \u003cli\u003eImproved torque and power delivery under normal driving conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The Denso IKH16TT Iridium TT spark plugs are aimed at drivers who want durable, high-performance ignition components for modern gasoline engines — especially those seeking long service intervals, sharper throttle response, and dependable starting. They suit everyday commuters, performance-minded owners, and technicians who prefer premium OE-style replacement parts that focus on longevity and consistent combustion quality.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long do Denso IKH16TT spark plugs typically last?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: These iridium TT plugs are engineered for extended life, often exceeding 100,000 miles under normal driving and maintenance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use IKH16TT plugs as direct replacements for original equipment?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: If IKH16TT matches your vehicle's specified part number and gap, they are suitable as OE-style replacements for compatible gasoline engines.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Denso","offers":[{"title":"Default Title","offer_id":67586771452089,"sku":"B071FR51VC","price":110.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/denso-ikh16tt-front-packaging.jpg?v=1790492700","url":"https:\/\/redleafauto.ca\/products\/denso-iridium-tt-spark-plugs-ikh16tt-4-pack-twin-tip-iridium-long-life-crisp-ignition","provider":"Redleaf Auto","version":"1.0","type":"link"}