Champion Copper Plus 905 Spark Plug Overview

Champion Copper Plus 905 is a replacement spark plug built for dependable ignition performance in a range of high-performance and small-engine applications. Its copper core electrode improves conductivity and heat control, while nickel-based electrode materials support consistent wear characteristics.

Use Champion 905 when you need a direct-fit spark plug for select Ferrari and Lamborghini applications, including models such as the Ferrari 348, 456, 550 Maranello, and Lamborghini Diablo.

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
• Flat seat construction with 0.75 in. reach
• 0.025 in. pre-gap size and removable nut terminal
• Champion Copper Plus small engine classification
• Part number 905 for easy catalog matching

Product Details

The Champion Copper Plus line focuses on practical ignition service with a copper core that helps transfer heat away from the firing end and maintain stable performance under operating load. This plug uses a 12 mm thread diameter, 15.880 mm hex size, and a resistor design, making it a straightforward service part for applications that specify the RA4HC plug type. For buyers searching for a Champion 905 spark plug or a Copper Plus replacement for Ferrari 348, Ferrari 456, Ferrari 550 Maranello, or Lamborghini Diablo applications, this part provides the core specifications needed for a proper match.

This part cross-references NGK 2316 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Misfire conditions from weak or inconsistent spark delivery
• Rough idle and hesitation under acceleration
• Reduced ignition efficiency from excessive plug wear
• Heat-related plug performance issues in demanding engines

Installation Notes and Tips

Verify the required plug type, thread diameter, reach, seat style, and gap before installation. Champion 905 is listed with a 0.025 in. pre-gap, while several vehicle applications note a 0.024-0.036 in. service gap in the fitment data; confirm the engine specification before use. Check the terminal style and use the removable nut only if your ignition lead requires it. For fitment reference, this plug is listed for 1984-1987 Ferrari GTO, 1985-1989 Lamborghini Countach, 1986-1990 Lamborghini LM002, 1989-1993 Ferrari Mondial t, 1990-2001 Lamborghini Diablo, and 2005-2010 Ferrari 612 Scaglietti.

• Fits 1984-1987 Ferrari GTO, N/A
• Fits 1985-1989 Lamborghini Countach, N/A
• Fits 1986-1990 Lamborghini LM002, N/A
• Fits 1989-1993 Ferrari Mondial t, N/A
• Fits 1990-2001 Lamborghini Diablo, N/A
• Fits 1991-1993 Lamborghini LM American, N/A
• Fits 1992-1994 Ferrari 512 TR, N/A
• Fits 1993-1995 Ferrari 348 Spider, N/A
• Fits 1993-1994 Ferrari 348 GTB, N/A
• Fits 1993-1994 Ferrari 348 GTS, N/A
• Fits 1995 Ferrari 512 M, N/A
• Fits 1995-1998 Ferrari 456 GT, N/A
• Fits 1997-1998 Ferrari 456 GTA, N/A
• Fits 1997-2002 Ferrari 550 Maranello, N/A
• Fits 1999-2001 Ferrari 456 M, N/A
• Fits 2002-2004 Ferrari 456 M GT, N/A
• Fits 2002-2004 Ferrari 456 M GTA, N/A
• Fits 2002-2005 Ferrari 575 M Maranello, N/A
• Fits 2005 Ferrari Superamerica, N/A
• Fits 2005-2010 Ferrari 612 Scaglietti, N/A

Quality Assurance

Champion Copper Plus spark plugs are built around a copper core electrode and nickel electrode materials for consistent service characteristics in specified applications. Part number 905 is cataloged to match the listed RA4HC applications and interchange references for accurate replacement selection.