NGK Iridium DF Spark Plug DF8H-11B

Get NGK Iridium DF Spark Plug DF8H-11B in Kenya

The NGK Iridium DF8H-11B spark plug is part of NGK’s premium line of iridium spark plugs, engineered to meet the demands of modern engines. Designed for efficiency, durability, and optimal combustion, this plug combines cutting-edge materials with precision manufacturing, ensuring reliable performance across a wide range of conditions.

About NGK and Iridium Spark Plug Technology

NGK is a globally recognized leader in ignition technology. With decades of innovation and rigorous quality control, NGK products are trusted in original equipment and aftermarket applications alike. Among its premium offerings, NGK’s iridium spark plugs stand out for their enhanced durability and performance.

Iridium, one of the rarest and most corrosion-resistant metals on Earth, has a melting point of around 2,450°C and is significantly harder than platinum. Its exceptional properties make it ideal for spark plug electrodes, where heat resistance and conductivity are critical.

Technical Features of the DF8H-11B

The DF8H-11B is a high-performance spark plug featuring NGK’s Double Fine Electrode (DF) design. It includes a fine-wire iridium center electrode and a platinum-tipped ground electrode, both designed to enhance spark efficiency and reduce wear.

Key Specifications:

• Center Electrode Material: Iridium alloy

• Ground Electrode Material: Nickel alloy with platinum chip

• Electrode Tip Diameter: 0.6 mm (fine-wire)

• Thread Diameter: 14 mm

• Thread Reach: 26.5 mm

• Hex Size: 16 mm

• Gap Size: 1.1 mm (pre-set)

• Heat Range: 8 (on NGK’s heat scale)

• Resistor: Yes (integrated for EMI suppression)

• Construction: Trivalent metal plating for anti-corrosion and anti-seizing

• Type: Resistor-type iridium spark plug

Performance and Efficiency Benefits

1. Precision Ignition

The ultra-fine iridium center electrode requires less voltage to produce a spark. This allows for more reliable ignition, especially under demanding operating conditions. The result is smoother engine performance, consistent combustion, and reduced misfiring.

2. Longevity and Wear Resistance

The use of iridium and platinum materials significantly extends the service life of the plug. These metals resist erosion and wear even under prolonged exposure to extreme combustion temperatures, allowing the plug to maintain its gap and spark integrity over time.

3. Improved Combustion Efficiency

Efficient spark generation leads to more complete combustion of the air-fuel mixture. This not only enhances engine power and responsiveness but can also contribute to better fuel efficiency and lower emissions.

4. Cold Start Reliability

The advanced materials and optimized electrode shape ensure fast, stable sparking in cold temperatures. This improves start-up performance, especially in colder climates or after long periods of engine inactivity.

5. Reduced Fouling

The fine-wire electrode design helps minimize the risk of fouling by promoting thorough combustion and self-cleaning during normal engine operation. This maintains performance consistency over a longer period.

Design Advantages

Double Fine Electrode Design

NGK’s DF (Double Fine) configuration features an iridium-tipped center electrode and a platinum pad on the ground electrode. This dual-metal design enhances durability while maintaining sharp spark edges, crucial for consistent ignition.

Trivalent Metal Plating

The plug shell is treated with a trivalent metal plating that offers superior resistance to corrosion and seizing. This facilitates easier removal and reinstallation during maintenance intervals.

Tapered Cut Ground Electrode

The tapered ground electrode design reduces obstruction of the spark path, improving flame kernel propagation. This contributes to more efficient combustion and faster flame spread.

Built-In Resistor

Electromagnetic interference (EMI) can interfere with onboard electronics. The built-in resistor in the DF8H-11B suppresses EMI, ensuring compatibility with modern engine management systems and onboard diagnostics.

Heat Range and Operating Conditions

With a heat range of 8 on NGK’s scale, the DF8H-11B offers a balanced thermal profile, making it suitable for engines that operate under a variety of conditions, from normal to high performance. It effectively dissipates heat to avoid pre-ignition or engine knock, while retaining sufficient heat to burn off carbon deposits.

Durability Testing and OEM Standards

NGK spark plugs are tested extensively for performance and reliability. The DF8H-11B meets or exceeds OEM specifications in:

• Thermal endurance

• Mechanical robustness

• Corrosion resistance

• Long-term spark efficiency

Each plug is manufactured to strict tolerances using advanced laser-welding techniques to ensure consistent quality.

Maintenance and Installation Tips

• Pre-Gapped for Convenience: The DF8H-11B comes pre-gapped at 1.1 mm. While it’s generally recommended to install as-is, it’s good practice to verify the gap based on engine requirements.

• Proper Torque: Spark plugs should be torqued to the manufacturer’s specifications to ensure proper sealing and avoid thread damage. Over-tightening can distort the plug shell or damage the cylinder head, while under-tightening can lead to poor heat dissipation.

• Dry Installation: NGK generally advises against using anti-seize compounds, as the plated threads are designed to resist corrosion and facilitate proper torque values without lubrication.

• Check Intervals: While iridium plugs have long service lives, periodic inspections (e.g., every 30,000–40,000 km) are recommended to check for deposits or electrode wear, especially in harsh driving environments.

Why Choose the NGK DF8H-11B?

Choosing the right spark plug is critical to engine health and performance. The NGK DF8H-11B offers a balanced solution that brings together:

• Long-lasting durability

• High-temperature resistance

• Enhanced ignition performance

• OEM-grade construction

• Reliable performance across diverse operating conditions

Whether for routine maintenance or as part of an engine performance upgrade, this plug represents one of the best options in NGK’s lineup of iridium spark plugs.

Conclusion

The NGK Iridium DF Spark Plug DF8H-11B is a technologically advanced component designed to meet the needs of modern engines. Featuring a fine iridium center electrode, platinum-enhanced ground electrode, and advanced anti-fouling and anti-corrosion design, it stands out as a premium option for anyone seeking long-lasting, high-performance ignition parts.

Engineered with precision and built to perform under pressure, the DF8H-11B reflects NGK’s commitment to innovation and quality in every spark.

Follow us on Facebook for more parts.