REL37B - Champion Aerospace Massive Wire Spark Plug

REL37B – Champion Aerospace Massive Electrode Aviation Spark Plug

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Overview

The Champion REL37B is a flight-critical, FAA-approved aviation spark plug, engineered for reliability and durability in a range of classic and vintage aircraft engines. This plug is part of Champion's renowned massive electrode series, often referred to as "massive wire" by technicians, which is celebrated for its long service life and high resistance to wear. The REL37B is a 14mm shielded plug with a 1/2-inch reach, specifically designed for engines that require this smaller thread configuration, such as the de Havilland Gipsy series and various Franklin engines.

This spark plug features a robust, two-prong massive electrode design (also known as a twin electrode) made from a high-performance nickel alloy. This construction provides a large surface area, ensuring excellent resistance to spark erosion and heat, which translates to a long, dependable service life. The "R" in the part number designates an integrated resistor, which is critical for suppressing radio-frequency interference (RFI) that can disrupt cockpit communications and navigation equipment.

Key Features

• Genuine Champion Aerospace Product: The industry-standard OEM and aftermarket plug, manufactured to the highest aviation quality standards.

• Massive Electrode Design: Features a robust two-prong, nickel-alloy massive electrode for exceptional durability and a long service life.

• Integrated Resistor (RFI Suppression): The "R" designation signifies a built-in resistor that protects sensitive avionics from radio-frequency interference.

• High-Alumina Insulator: Utilizes a superior ceramic insulator for high dielectric strength, preventing high-voltage leakage and resisting thermal shock.

• Gas-Tight "Fired Glass" Seal: A proprietary glass-to-metal seal creates a permanent, gas-tight bond between the center electrode and the insulator, preventing combustion gas leakage under high pressure.

  
  

Technical Specifications

• Part Number: REL37B

• Component Type: Aviation Spark Plug

• OEM Manufacturer: Champion Aerospace

• Electrode Design: Massive Electrode (Two-Prong / Twin Electrode)

• Thread Size: 14 mm

• Thread Reach: 1/2" (0.500 inches)

• Shielding Thread: 5/8"-24

• Hex Size: 13/16"

• Resistor: Yes (Mil-Spec Resistor)

  
  

Aircraft Compatibility

This spark plug is specified for a wide range of classic aircraft, particularly those powered by Franklin and de Havilland Gipsy series engines.

Common Engine Applications:

• Franklin: 6A4-200, 6V4-200, 6V6-245, 6A-335, 6V335 (O-335 series)

• de Havilland (Bristol Siddeley): Gipsy Major, Gipsy Queen 30, Gipsy Queen 70

Common Aircraft Applications:

• Bell: 47 (including 47H Bellairus)

• Cessna: 170, 172, 175 (with Franklin engine STC)

• de Havilland: DH104 Dove, DH114 Heron, DHC-1 Chipmunk, Tiger Moth, Puss Moth

• Handley Page: Marathon

• Hiller: OH-23 Raven

• Percival: Prentice, Proctor

• Scottish Aviation: Pioneer

• Stinson: 108 (with Franklin engine STC)

• Waterman: Aerobile

Note: This compatibility list is for general reference only. The specific aircraft and engine Illustrated Parts Catalog (IPC) or maintenance manual is the final and absolute authority for determining part applicability.

Why Choose REL37B?

The Champion REL37B is an engineered component designed for the unique demands of vintage powerplants. Its proven massive electrode design provides the robust, long-lasting performance required by these engines, while the integrated resistor ensures it is compatible with modern avionics. Choosing a genuine, certified Champion spark plug is a non-negotiable requirement for ensuring the safety, reliability, and airworthiness of your aircraft's ignition system.

Note: The REL37B is a flight-critical engine component. It must be installed by a certified A&P/IA mechanic. The electrode gap must be checked and set to the dimension specified in the engine manual. Use a new copper gasket and apply an aviation-grade, electrically conductive anti-seize compound to the threads of the plug only. Do not get anti-seize on the electrodes. The plug must be tightened to the specific torque value listed in the engine maintenance manual.