REB37E - Champion Aerospace Two Electrode Massive Wire Spark Plug

REB37E – Champion Aerospace 18mm Massive Electrode Resistor Spark Plug

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The Champion Aerospace REB37E is one of the most proven and widely utilized spark plugs in general aviation, engineered for exceptional durability and reliable performance in a vast range of Lycoming and Continental reciprocating engines. This spark plug features a robust, two-prong massive electrode design, making it highly resistant to the operational rigors of piston engine flight, including vibration and lead or carbon fouling. As a resistor-type plug, it incorporates an internal component designed to suppress radio frequency interference (RFI), protecting the clarity and function of the aircraft's communication and navigation avionics.

Manufactured to the highest industry standards, the REB37E combines advanced materials—from its high-purity alumina insulator to its nickel-alloy electrodes—to provide consistent, high-energy sparks for efficient combustion. Its mid-range heat rating and durable construction make it the standard equipment choice for hundreds of the most common engine models flying today, offering a superb balance of performance and longevity.

Key Features

• Massive Two-Electrode Design: Features two heavy-duty, nickel-alloy ground electrodes, providing a long service life and exceptional resistance to mechanical and vibratory stress compared to fine-wire designs.

• Built-In RFI Resistor: An internal glass-and-carbon resistor dampens the electrical discharge, suppressing radio frequency emissions that can interfere with sensitive avionics.

• High-Purity Alumina Insulator: The ceramic insulator is made from a high-purity aluminum oxide (Al2​O3​) formulation, providing superior dielectric strength to prevent voltage flashover and exceptional thermal shock resistance to eliminate cracking.

• Copper-Glass Seal: A proprietary copper-and-glass powder mixture is fused under high temperature and pressure to form a permanent, gas-tight seal between the center electrode, insulator, and shell, locking in combustion pressure.

• Broad Engine Applicability: Certified for use on a vast number of the most common Lycoming and Continental engine models, making it a versatile and indispensable part for MROs and operators.

Technical Specifications

• Part Number: REB37E

• Component Type: Aviation Spark Plug

• Manufacturer: Champion Aerospace

• Thread Size (into cylinder): 18mm x 1.5mm pitch

• Shielding Thread (for harness): 3/4-20 UNEF

• Electrode Design: Two-Prong Massive, Nickel Alloy

• Resistor Type: Yes, Integral

• Heat Rating: 37 (on the Champion scale)

• Reach: 1/2 inch (12.7 mm)

Engine Compatibility

The REB37E is approved for use in a wide variety of the most common piston engines in general aviation. Applicable engine families include, but are not limited to:

• Lycoming: O-320, O-360, IO-360, O-540, IO-540, TIO-540 series

• Continental: O-470, IO-470, IO-520, IO-550, TSIO-520 series

Crucial Note: This list is for general reference. The specific engine model's Approved Parts List (APL) as found in the latest revision of the engine maintenance or overhaul manual is the final authority for spark plug eligibility.

Applications

• Primary Ignition Component: Delivers the high-voltage spark required to initiate combustion within the engine's cylinders.

• Dual Ignition Systems: A core component of the redundant dual magneto ignition system required on all certified aircraft engines, providing critical redundancy for safety of flight.

Why Choose REB37E?

Choosing the genuine Champion REB37E provides the confidence of installing the industry-standard spark plug trusted by engine manufacturers and mechanics worldwide. The massive electrode design is engineered for durability, offering a long, reliable service life and a high tolerance for the lead deposits found in aviation fuels. This robust construction makes it a cost-effective and low-maintenance choice for both fleet and individual operators. Backed by Champion's century of ignition expertise, the REB37E is the benchmark for performance and reliability.

A spark plug's heat rating is a measure of its ability to transfer thermal energy from its firing end to the cylinder head, and it is a critical parameter for engine health. This characteristic is a function of the physical design, specifically the length of the ceramic insulator nose that projects into the combustion chamber. A "hotter" plug (lower number on the Champion scale) features a longer insulator nose. This creates a longer, more tortuous path for heat to travel from the center electrode tip to the metal shell of the plug, causing the tip to retain more heat and operate at a higher temperature. This is beneficial for lower-compression engines as it helps to burn off carbon and lead deposits. Conversely, a "colder" plug (higher number) has a much shorter insulator nose, providing a short, direct path for heat to be rapidly conducted away into the cylinder head. This keeps the firing tip cooler, preventing it from becoming an incandescent glow point that could lead to destructive pre-ignition in high-compression, high-horsepower engines. The REB37E's mid-range heat rating represents an optimized thermal balance for the majority of popular, naturally aspirated general aviation powerplants.

Note: This is a flight-critical engine component. Spark plugs have a finite service life and must be inspected, cleaned, gapped, and rotated between top and bottom positions at the intervals specified by the engine manufacturer's maintenance schedule. A new copper gasket (e.g., C10S/STD295) must be used every time a spark plug is installed. Proper installation requires torquing to the value specified in the engine maintenance manual. All service must be performed by a certified A&P mechanic.

Documentation

The definitive application data for this spark plug is detailed in the latest revision of the Champion Aerospace Aviation Application Chart (AV-11). Final installation eligibility must be confirmed against the engine manufacturer's maintenance and parts manuals.