Champion 346 Spark Plug

Reliable Ignition with Champion Copper Plus Spark Plug 346

The Champion Copper Plus Spark Plug 346 is engineered to deliver consistent ignition performance for a wide range of vehicles including Acura, Honda, Toyota, and Subaru models. Designed with durable nickel electrodes and a precise pre-gap, this spark plug supports efficient combustion and engine reliability.

• Ground electrode core and center electrode tip made of nickel for durability
• Pre-set gap size of 0.041 inches (1.05 mm) for optimal spark
• Non-removable nut electrical terminal type for secure connection
• Flat seat type with 0.75 inch reach and 14 mm thread diameter
• Resistor type spark plug to reduce electrical noise interference
• Hex size of 0.625 inches (15.88 mm) for easy installation
• Manufacturer heat range rating of 10 suitable for various driving conditions

Detailed Features and Specifications

The Champion Copper Plus 346 spark plug features a nickel ground electrode core and center electrode tip, providing reliable conductivity and resistance to wear. The pre-gap is factory set at 0.041 inches (1.05 mm), ensuring consistent spark delivery without the need for adjustment. Its flat seat design and 0.75 inch reach make it compatible with many popular models such as the Toyota Camry, Honda Accord, Subaru Outback, and Acura RSX. The spark plug includes a built-in resistor to minimize radio frequency interference, which is important for modern vehicles with sensitive electronics.

About the Champion Copper Plus Product Line

The Copper Plus line from Champion is designed to offer dependable ignition performance using copper core technology. Copper provides excellent thermal conductivity, which helps maintain stable operating temperatures and efficient combustion. This line is suitable for a broad range of vehicles requiring a heat range of 10, making it a practical choice for many Acura, Toyota, and Subaru models.

Applications and Common Issues Addressed

• Restores proper ignition in vehicles experiencing misfires or rough idling
• Improves fuel efficiency by ensuring complete combustion
• Reduces engine hesitation during acceleration
• Helps prevent hard starting in cold weather conditions
• Minimizes electrical interference affecting onboard electronics

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.041 inches (1.05 mm) as factory preset. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended specifications to avoid damage to the threads or seat. The 15.88 mm hex size allows for standard spark plug socket compatibility. Ensure the spark plug is compatible with your vehicle’s make and model, such as the Honda Civic, Toyota Corolla, or Subaru Forester, to maintain optimal engine performance.

Quality Assurance and Warranty

Champion Copper Plus spark plugs are manufactured to meet OEM specifications and undergo rigorous quality control testing. The part number 346 is backed by Champion’s commitment to durability and performance. While specific warranty details may vary, Champion typically offers coverage against manufacturing defects to ensure customer confidence in their ignition components.