Denso Iridium Twin‑Tip Spark Plug 4702 — 0.4mm Centre Electrode, Long‑Life Performance

The Denso 4702 is an iridium Twin-Tip spark plug engineered for long life, sharper ignition and better fuel economy without altering your engine.

Designed using Denso’s iridium and platinum materials plus a 360-degree laser weld, the 4702 delivers exceptional durability and consistent spark performance. Its Twin-Tip (TT) design uses an ultra-fine 0.4 mm iridium center electrode and a 0.7 mm needle ground electrode to concentrate spark energy, boosting ignitability for smoother starts, improved throttle response and optimized combustion. Built with vehicle-specific fitment and precision manufacturing, these plugs are intended as direct replacements for compatible engines that require high-performance, long-life spark plugs.

How does this spark plug improve engine response and acceleration?

The Twin-Tip electrode geometry focuses the spark into a tighter, hotter zone so the air–fuel mixture ignites more reliably. That sharper ignition produces a steadier burn and reduces misfires, which you’ll notice as crisper throttle response and more immediate acceleration under load.

• 0.4 mm iridium center electrode concentrates spark energy
• 0.7 mm needle ground electrode minimizes spark scatter
• Tighter, more consistent ignition reduces hesitation

What makes the Denso 4702 more durable than standard plugs?

Durability comes from premium materials and manufacturing methods. Denso’s high-iridium alloy combined with a 360-degree laser weld and platinum elements resists electrode erosion and thermal wear, allowing the plug to maintain its gap and performance far longer than conventional designs.

• Patented high-concentration iridium alloy for electrode longevity
• 360-degree laser welding secures the center electrode against breakage
• Precision-pre-fired components ensure consistent quality and fit

Will switching to this plug help my fuel economy?

More reliable ignitability and a stable combustion event can lead to marginal gains in fuel efficiency, particularly if your current plugs are worn. While results vary by vehicle and driving style, improved spark reliability helps the engine burn fuel more completely, which can convert to modest economy improvements over time.

• Enhanced ignitability reduces incomplete combustion
• Consistent spark minimizes wasted fuel from misfires
• Potential for better miles-per-gallon under normal driving

How easy is installation and what are the build features?

The Denso 4702 is vehicle-specific and designed for straightforward replacement using standard hand tools. Denso machines the threads to prevent cross-threading, pre-fires each plug to verify quality and uses a multi-rib insulator and copper-glass seal for reliability in harsh engine environments.

• Machine-rolled threads reduce risk of seizing during install/removal
• Five-rib insulator design helps prevent flashover
• Copper-glass seal and purified alumina insulator for tight, durable construction
• Comes 100% pre-fired for verified performance out of the box

Who is this for? The Denso 4702 is aimed at drivers and mechanics who want a long-lasting, high-ignition-performance spark plug for vehicles specified to accept this part. It’s a good fit for owners seeking improved throttle response, dependable cold starts and extended service intervals over standard nickel plugs, and for anyone doing a routine tune-up who wants a premium plug with proven manufacturing controls and vehicle-specific fitment.