Champion RV8C Copper Plus Marine Spark Plug - Champion Spark Plug 121

The Champion RV8C is a Copper Plus marine spark plug (Champion Spark Plug Number 121) built as a quality OEM replacement for gasoline marine engines. It uses a copper core center electrode that improves conductivity and gives precise control over heat range, which helps the plug resist overheating under sustained heavy engine loads and extends service life compared to plugs without a copper core.

The shell is finished with Champion's patented TinTac and ULTRASEAL coatings for maximum corrosion resistance in the wet, salt-exposed marine environment, and the plug incorporates Champion's patented SAC-9 semiconductor resistor for maximum EMI and RFI suppression, reducing interference with onboard electronics and marine radios. Each RV8C is manufactured to ISO and SAE standards for consistent, proven ignition performance.

This is a standard 14mm thread spark plug with an alloy steel shell, sold as a single plug (Unit Count: 1). It is intended as a direct, like-for-like replacement wherever a Champion 121 / RV8C spark plug is specified.

Specifications

• Brand: Champion
• Manufacturer Part Number: CCH121
• Champion Spark Plug Number: 121
• Core Material: Copper
• Thread Size: 14mm
• Shell Material: Alloy Steel
• Shell Coating: TinTac and ULTRASEAL corrosion-resistant coating
• EMI/RFI Suppression: SAC-9 semiconductor resistor
• Unit Count: 1 spark plug
• Weight: 0.15 pounds
• UPC: 037551000050

Frequently Asked Questions

What is the Champion RV8C spark plug made of? The Champion RV8C (Champion Spark Plug 121) uses a copper core center electrode inside an alloy steel shell, with the shell finished in Champion's TinTac and ULTRASEAL coating for corrosion resistance.

Is this a copper spark plug? Yes, the RV8C is part of Champion's Copper Plus line, meaning its center electrode has a copper core for increased conductivity and better heat range control.

What thread size does the Champion RV8C use? The Champion RV8C spark plug has a 14mm thread size.

How many spark plugs come in this package? This listing is for a single Champion RV8C spark plug (Unit Count: 1).

What is the Champion part number for this spark plug? The plug is identified as Champion Spark Plug Number 121, sold under manufacturer part number CCH121.

How much does the Champion RV8C spark plug weigh? The Champion RV8C spark plug weighs 0.15 pounds.

Does the Champion RV8C help with radio or electronics interference? Yes, it includes Champion's patented SAC-9 semiconductor resistor, designed for maximum EMI and RFI suppression to reduce interference with onboard electronics.

Is the Champion RV8C designed for marine use specifically? Yes, the RV8C is marketed as a Copper Plus marine spark plug designed to resist overheating under the heavy, sustained loads typical of marine engines.

What standards is the Champion RV8C built to? The Champion 121 / RV8C spark plug is built to ISO and SAE standards for proven ignition performance.

Why choose a copper core plug over other spark plug types? The copper core electrode in the Champion RV8C allows for more accurate control of heat range, which supports longer plug life and more consistent performance under heavy engine loads.

What is the UPC for the Champion 121 spark plug? The Champion RV8C (Champion Spark Plug 121) carries UPC 037551000050.

Is the Champion RV8C an OEM part or aftermarket? The Champion RV8C is manufactured by Champion as a quality OEM-grade replacement spark plug, not a third-party aftermarket substitute.