Champion 344 Spark Plug

Champion Copper Plus 344 Spark Plug

Champion Copper Plus 344 is a resistor spark plug built for dependable ignition performance and consistent heat control. Its copper core electrode improves conductivity, while nickel-based electrode materials support steady wear characteristics for everyday driving and OE-style service.

Key Features

• Copper core electrode for improved conductivity and heat management
• Nickel center electrode tip and nickel ground electrode core material
• Resistor type design for ignition system noise control
• Pre-gapped at 0.035 inch with a flat seat design
• 14 mm thread diameter, 0.75 inch reach, and 0.625 inch hex size
• Champion Copper Plus classification, part number 344

Product Details

The Champion Copper Plus line focuses on practical, dependable ignition service with a copper core that helps transfer heat efficiently and maintain stable spark performance. Part number 344 uses a nickel center electrode tip and nickel copper alloy ground electrode material, along with a removable nut terminal and resistor construction. The RC9YC plug type and flat seat design make it a direct-match option for a wide range of import and domestic applications, including Mercedes-Benz S65 AMG, Chevrolet Cruze, and Volkswagen Jetta service needs where the specified plug type and gap are required.

This part cross-references DENSO Auto Parts 5040 and FEL-PRO 1094 for the same application.

Vehicle Fitment

• Fits 2018-2020 Mercedes-Benz Maybach S650, N/A; notes: 2 plugs per cylinder required with a gap of 0.028 inches, plug type number RC9YC; Copper Plus.
• Fits 2015-2020 Mercedes-Benz S65 AMG, N/A; notes: 2 plugs per cylinder required with a gap of 0.028 inches, plug type number RC9YC; Copper Plus.
• Fits 2012-2018 Chevrolet Sonic, N/A; notes: gap 0.028 in; plug type number RC9YC; Copper Plus.
• Fits 2011-2015 Chevrolet Cruze, N/A; notes: gap 0.028 in; plug type number RC9YC; Copper Plus.
• Fits 2000-2005 Volkswagen Jetta, N/A; notes: 0.032 inch gap; plug type RC9YC; Copper Plus.
• Fits 1995-2005 Dodge Neon, N/A; notes: gap 0.035 in; actual OE part; plug type number RC9YC; Copper Plus.

What It Is Used For

• Replacing worn spark plugs that can cause rough idle
• Restoring consistent spark delivery during acceleration
• Addressing misfire conditions tied to plug wear or incorrect gap
• Supporting proper combustion in engines specified for RC9YC plug type
• Maintaining ignition performance in high-mileage service intervals

Installation Notes and Tips

Verify the required plug type, thread diameter, reach, seat style, and gap before installation. Several listed applications call for a different gap than the pre-gap size shown here, so check the vehicle service specification and adjust only if needed. Confirm the engine uses RC9YC-equivalent fitment and follow the manufacturer’s torque procedure during installation.

Quality Assurance

Champion Copper Plus spark plugs are built around a copper core design for dependable conductivity and heat control, with nickel electrode materials chosen for consistent wear characteristics. Part number 344 is engineered to meet the fitment and specification requirements listed above.