Bosch 9661 Spark Plug

Overview of Bosch OE Fine Wire Double Iridium Spark Plug 9661

The Bosch OE Fine Wire Double Iridium Spark Plug 9661 is engineered for reliable ignition performance in select Chrysler, Dodge, Jeep, and Volkswagen vehicles. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Double iridium center electrode tip for enhanced durability
• Tapered ground electrode tip design with copper core
• Standard ground configuration with a single ground electrode
• Pre-gap size of 1.3 mm for optimal spark gap
• Hex size of 16 mm and thread diameter of 14 mm for proper fitment
• Manufacturer heat range rating of 8 for balanced thermal performance
• Ceramic projected insulator for improved insulation and heat resistance
• Compatible with 4-cycle engines in specific vehicle models

Detailed Product Description and Attributes

The Bosch 9661 spark plug features a double iridium center electrode tip, combining iridium with a nickel-yttrium and copper core to provide long-lasting wear resistance and stable spark delivery. The ground electrode tip is tapered and constructed from a platinum-iridium alloy with nickel-yttrium and copper, supported by a copper core to ensure efficient heat dissipation and durability. This spark plug has a standard ground configuration with one ground electrode, designed to maintain consistent spark performance.

The pre-gap size is set at 1.3 mm, which is critical for proper ignition timing and combustion efficiency. The spark plug’s tapered seat type and 25 mm reach ensure a secure fit in the combustion chamber. The ceramic projected insulator enhances electrical insulation and heat resistance, contributing to reliable operation under various engine conditions. Additionally, the resistor value of 6000 ohms helps reduce electromagnetic interference.

OE Fine Wire Double Iridium Product Line

The Bosch OE Fine Wire Double Iridium line focuses on delivering precise ignition performance through the use of fine wire iridium electrodes on both the center and ground sides. This design reduces voltage requirements and improves ignitability, which can contribute to smoother engine starts and better fuel efficiency. The 9661 spark plug is part of this line, offering the benefits of double iridium technology tailored for specific vehicle applications.

Compatible Vehicles and Common Applications

• Chrysler Caravan, Grand Caravan, Pacifica, Town & Country, Voyager
• Dodge Caravan, Grand Caravan, Journey
• Jeep Wrangler
• Volkswagen Routan

This spark plug is designed for 4-cycle engines in these models, providing reliable ignition and helping to address common issues such as:

• Engine misfires or rough idling
• Reduced fuel efficiency
• Difficulty starting the engine
• Inconsistent acceleration
• Increased emissions due to incomplete combustion

Installation Notes and Tips

• Ensure the spark plug gap is set to 1.3 mm before installation if adjustment is needed
• Use a torque wrench to tighten the spark plug to manufacturer specifications to avoid damage
• Check for proper thread engagement and avoid cross-threading during installation
• Inspect the ignition system components for wear or damage when replacing spark plugs
• Replace spark plugs in sets to maintain consistent engine performance

Quality Assurance and Warranty

Bosch OE Fine Wire Double Iridium spark plugs are manufactured to meet strict quality standards, using premium materials such as iridium and platinum alloys for electrode tips and copper cores for heat management. The 9661 spark plug is designed to provide consistent performance and durability in compatible Chrysler, Dodge, Jeep, and Volkswagen vehicles. While specific warranty details may vary, Bosch products typically come with a limited warranty covering defects in materials and workmanship.