Champion 418 Spark Plug - Intake Side

Reliable Ignition Performance for Acura, Honda, and More

The Champion Copper Plus 418 spark plug is engineered to deliver consistent ignition performance for vehicles like the Acura Integra, Honda Civic, and Mitsubishi 3000GT. Designed with durable nickel electrodes and a resistor to reduce electrical interference, this spark plug supports efficient combustion and engine reliability.

• Ground electrode core made of nickel for durability
• Center electrode tip constructed from nickel
• Pre-gapped to 0.041 inches (1.05 mm) for optimal spark
• Flat seat type with a 0.75-inch reach for proper fitment
• Non-removable nut electrical terminal type
• Resistor type spark plug to minimize radio frequency interference
• Thread diameter of 14 mm (0.551 inches) with a heat range rating of 9
• Hex size of 15.88 mm (0.625 inches) for standard installation tools

About the Champion Copper Plus Spark Plug Line

The Copper Plus line from Champion is designed to provide reliable ignition with copper core technology that enhances conductivity and heat dissipation. This line balances performance and durability, making it suitable for a range of vehicles including the Dodge Stealth and Honda Prelude. The Copper Plus 418 spark plug maintains consistent firing and helps support engine efficiency under normal driving conditions.

Technical Details and Compatibility

The Champion Copper Plus 418 spark plug features a single ground electrode made of nickel, paired with a nickel center electrode tip. The plug is pre-gapped at 0.041 inches (1.05 mm) to ensure proper spark gap for combustion. It has a flat seat design and a reach of 0.75 inches, matching the specifications required for models such as the Mitsubishi Montero and Acura Legend. The resistor built into the plug reduces electrical noise that can interfere with vehicle electronics.

Common Applications and Problem Solving

• Restores proper ignition in Acura Integra and Honda CRX engines
• Helps reduce misfires and rough idling in Dodge Stealth and Mitsubishi 3000GT
• Improves fuel efficiency by maintaining consistent spark delivery
• Addresses ignition interference issues with resistor design
• Supports engine performance in vehicles with flat seat spark plug requirements

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.041 inches (1.05 mm) as specified. Use a 15.88 mm (0.625 inch) hex socket for proper torque application. The non-removable nut electrical terminal requires compatible ignition wires. Ensure the thread diameter of 14 mm and reach of 0.75 inches match your vehicle’s specifications to avoid damage. Tighten to manufacturer torque recommendations to prevent thread damage.

Quality Assurance and Warranty

Champion Copper Plus spark plugs are manufactured to meet OEM specifications for heat range and durability. The part number 418 is tested for consistent performance in compatible vehicles including Acura, Honda, Dodge, and Mitsubishi models. While specific warranty details vary by distributor, Champion products typically come with a limited warranty against manufacturing defects.