Bosch 8121 Spark Plug

Overview of Bosch OE Fine Wire Double Platinum Spark Plug 8121

The Bosch OE Fine Wire Double Platinum Spark Plug 8121 is engineered for reliable ignition performance in select Nissan and Suzuki vehicles. Designed to meet OEM specifications, this spark plug supports efficient combustion and consistent engine operation for models like the Nissan Sentra and Suzuki Equator.

• Double platinum electrodes for enhanced durability and stable spark
• 6000 ohm resistor to reduce electrical interference
• Standard ground electrode tip and configuration
• 1.1 mm pre-gap size optimized for precise ignition
• Flat seat type with 12 mm thread diameter and 26.5 mm reach
• Ceramic projected insulator for improved heat resistance
• Compatible with 4-cycle engines in Nissan and Suzuki vehicles

Detailed Features and Specifications

This Bosch spark plug features a center electrode tip made of platinum, supported by a nickel-yttrium and copper core, which ensures consistent spark delivery and longevity. The ground electrode tip combines platinum and nickel-yttrium materials, providing wear resistance and stable performance over time. With a manufacturer heat range of 8, this spark plug is suitable for a variety of driving conditions. The 14 mm hex size allows for straightforward installation and removal. The ceramic insulator is projected to improve heat dissipation and prevent fouling, contributing to reliable ignition cycles.

OE Fine Wire Double Platinum Product Line

The OE Fine Wire Double Platinum line by Bosch is designed to replicate original equipment quality with enhanced electrode materials. This product line uses fine wire platinum electrodes on both the center and ground sides, which helps maintain a stable spark and extends service life compared to conventional spark plugs. The 8121 part number is part of this line, offering a balance of durability and performance for Nissan and Suzuki 4-cycle engines.

Compatible Vehicles and Common Applications

• Nissan Sentra ignition system maintenance
• Nissan Versa and Versa Note spark plug replacement
• Suzuki Equator and Frontier engine tune-ups
• Addressing misfires and rough idling in compatible models
• Improving fuel efficiency and throttle response

Installation Notes and Tips

Ensure the spark plug gap is set to 1.1 mm before installation if adjustment is necessary. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended specifications to avoid damage to the threads or seat. The 14 mm hex size fits standard spark plug sockets, facilitating installation in tight engine compartments. Always inspect the spark plug hole for debris before installation to prevent contamination.

Quality Assurance and Warranty

Bosch OE Fine Wire Double Platinum Spark Plug 8121 is manufactured to meet strict OEM standards, ensuring consistent performance and durability. The inclusion of a 6000 ohm resistor helps minimize radio frequency interference, protecting vehicle electronics. While specific warranty details may vary, Bosch products typically come with a limited warranty covering defects in materials and workmanship.