Bosch FR78 Spark Plug

Reliable Ignition Performance for BMW, Land Rover, and More

The Bosch Nickel FR78 spark plug is engineered to deliver consistent ignition performance for a range of vehicles including BMW 328i, Land Rover Range Rover, and Rolls-Royce Phantom models. Designed with durable nickel electrodes and a copper core, this spark plug supports efficient combustion and reliable engine operation.

• Resistance: 6000 ohms for effective noise suppression
• Four ground electrodes with multiple tip design for improved spark stability
• Nickel ground electrode core and tip for durability
• Copper center electrode core with nickel tip for optimal conductivity
• Pre-gap size of 0.9 mm for precise ignition timing
• Flat seat type with 19 mm reach and 14 mm thread diameter
• Removable nut electrical terminal for easy connection
• Ceramic insulator with projected design for heat resistance
• Manufacturer heat range rating of 7 suitable for various driving conditions
• Hex size 16 mm for standard installation tools
• Resistor type spark plug to reduce electromagnetic interference

About the Bosch Nickel Spark Plug Line

The Bosch Nickel product line focuses on spark plugs featuring nickel alloy electrodes that provide a balance of durability and cost-effectiveness. The FR78 model benefits from this line’s design, offering reliable secondary ignition components suitable for 4-cycle engines in premium vehicles such as BMW 330i and Mini Cooper. The nickel electrodes contribute to consistent spark delivery and extended service life under normal operating conditions.

Technical Details and Compatibility

The Bosch FR78 spark plug is designed with a 14 mm thread diameter and a 19 mm reach, making it compatible with a variety of European luxury vehicles. Its four ground electrodes with multiple tip designs enhance spark exposure and combustion efficiency. The copper core center electrode improves electrical conductivity, while the ceramic projected insulator ensures heat resistance and durability. This spark plug is compatible with models including BMW 318ti, 325xi, Land Rover X5, and Rolls-Royce Silver Seraph.

Common Applications and Problem Solving

• Restores engine misfire issues caused by worn or fouled spark plugs
• Improves ignition stability in BMW 525i and 540i engines
• Reduces electromagnetic interference in sensitive electronic systems
• Supports consistent combustion in Land Rover Range Rover and Mini Cooper models
• Helps maintain fuel efficiency and smooth engine performance

Installation Notes and Tips

Ensure the spark plug gap is set to the specified 0.9 mm pre-gap before installation. Use a 16 mm socket wrench to tighten the spark plug to the manufacturer’s recommended torque. The removable nut electrical terminal allows for straightforward connection to ignition wires. Verify compatibility with your vehicle’s make and model, such as BMW 330xi or Rolls-Royce Arnage, to ensure proper fitment.

Quality Assurance and Warranty

Bosch spark plugs, including the FR78, are manufactured to meet strict quality standards for ignition components. The resistor design helps minimize radio frequency interference, supporting vehicle electronics. While specific warranty details are not provided, Bosch products typically adhere to industry standards for durability and performance.