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Aviation Spark Plug With the most automated manufacturing processes and the most innovative spark plug in the aviation industry. Made in USA.

High Conductivity Copper Core Center Electrode copper, co-extruded inside a nickel alloy sleeve ensures outstanding heat and electrical conductivity while the nickel sleeve offers high resistance to corrosive combustion gases.

High Alumina Ceramic Insulator high mechanical strength, superior dielectric properties, proprietary protective glaze, provides high performance to conquer severe operational conditions. "Clean Collar" massive electrode "V" tip focuses heat to reduce fouling and enhance heat range control.

Proprietary Glass Center Seal 21st century 'fired in' resistor replaces the multipart screw, spring, carbon pile stack up used in competitive plugs and known to suffer from resistance value instability that can cause misfires, wasted fuel, engine roughness.

Nickel Finish environmentally preferable electrolytic nickel provides outstanding durable finish, superior corrosion protection, and extreme wear resistance.

Nickel Ground Electrodes aviation grade nickel electrode design focuses on minimizing sparking voltage requirements while maintaining specification gaps to ensure large, stable 'flame kernels' for on-time ignition and complete combustion.

Vacuum Infused Center Electrode proprietary, vacuum infusion process seals electrode/insulator gap providing stable heat range and superior center electrode cooling (heat flow to the insulator).

Hot-Lock Assembly intense pressure and heat create positive, zero-leakage, shrunk in seal between insulator and shell to contain the hot, high pressure combustion cycle gases.

Harness Wire Contact smooth, uninterrupted, oxide treated spring contact surface offers enhanced corrosion resistance, is chemically bonded to the fired-in resistor providing the ultimate harness/spark plug termination integrity and energy transfer.

Application Guide

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Good product but took a long time to receive.

July 23, 2020

Brand new, gaps set perfectly!

July 8, 2020

Spruce pricing was best. As far as the plug goes... this design is especially good for older radials that were not designed for 100 LL. This design helps burn off the lead deposits.

June 5, 2020

Its a spark plug. It looks pretty jazzy with the shiny nickle plating. The engine runs well with them. The price (by aircraft standards) is pretty reasonable.

Robert J
May 12, 2020

Great quality spark plug and the best service aircraft supply company. What a combination!!!

John W
November 1, 2019

Good packaging, arrived quickly, 8 out of 8 plugs correctly gapped when removed from their sealed plastic containers.

Chris P
January 18, 2019

I had to switch from REM40E plugs to these UREM37BY plugs for clearance purposes for my A65. They run great, no problems.

John B
December 16, 2018

In my opinion they hold up better than champions.

Sherman C
December 15, 2018

Great plugs! My existing Champion plugs all ohm tested well within specs yet mag checks always caused the engine to stumble and a large RPM drop. 8 UREM37BY plugs later and the engine is smooth and runs much, much better. Ive always preferred the BY plugs over standard massive. Highly recommended!

Joe W
May 25, 2018

Tempest plugs have always been great. The service from Aircraft Spruce and particularly Robin McHugh was awesome. Iâm on the west coast and I still got my order in 3 days!! Thanks.

January 26, 2018


Q: Do the Tempest spark plugs come with new copper gaskets?

Yes, each plug includes a copper gasket.

Q: Is this Tempest UREM37BY a 18mm cylinder barrel size?

Yes, this is a 18mm.

Q: What is the difference between the urem37by and champion rem37by?

Only the brand. UREM37BY is made by Tempest, REM37BY is made by Champion. The applications are the same.