425.90
The Bosch FR8KI33V (also listed in Bosch catalogs as 0242230519, short code FR 8 KI 33 V) is a premium iridium spark plug designed for petrol engines that demand reliable ignition performance and long service life.
Key Features & Description:
• Iridium-enhanced firing pin on the center electrode for improved wear resistance, stable sparks, and extended life compared with standard copper plugs.
• Tapered iridium-enhanced ground electrode helps sustain ignition performance over time.
• Large copper core center electrode boosts heat transfer and reduces fouling.
• Nickel-plated housing and thread provide corrosion protection and make installation easier without seizure in aluminum heads.
• Factory-preset gap for hassle-free swap-in replacement.
• Ribbed insulator design reduces flash-over misfires under varied conditions.
Typical Specs:
• Electrodes: Iridium center, enhanced ground
• Thread size: M14 × 1.25
• Electrode gap: 1.3 mm (factory)
• Tightening torque: 28 Nm
• Spark position: 4 mm
• Sealing: Flat-mouldable seat
Bosch FR8DII33X Double-Iridium spark plugs are engineered for high-performance gasoline engines with an emphasis on longer life, more reliable ignition, and consistent combustion. The FR8DII33X variant features iridium firing pins on both the center and ground electrodes, which significantly improves wear resistance and spark performance compared to standard or single-iridium plugs. These plugs are developed to the same high quality standards as original equipment (OEM), ensuring durability and compatibility with modern petrol engines.
Key Features:
• Double-iridium electrodes: Iridium on both the center and ground electrodes for enhanced durability and thermal strength.
• Laser-welded iridium tips: Increase lifespan — potentially up to 4× longer than standard plugs.
• Focused ignition: Improved ignitability and combustion stability.
• Resistor built-in: Helps reduce electrical interference and engine misfires.
Typical Specs:
• Electrode gap ~1.1 mm, M14 × 1.25 thread with 19 mm reach, and 16 mm hex size.
