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Tempest Aviation Spark Plug UREM40E

131 Reviews 11 Answered Questions
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Overview

MASSIVE ELECTRODE SPARK PLUG

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.
   
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Application Guide

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Reviews

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Best price I have found. A great plug!

Joseph S Verified Purchase

Tempest Spark Plug UREM40E
June 11, 2025

By golly, that spark plug was a real beaut!

Mark B Verified Purchase

Tempest Spark Plug UREM40E
May 20, 2025

White B Verified Purchase

Tempest Spark Plug UREM40E
May 1, 2025

White B Verified Purchase

Tempest Spark Plug UREM40E
April 29, 2025

GOOD PLUGS. THEY MAKE SPARK.

Ernest B Verified Purchase

Tempest Plug UREM40E 12 Pack
March 27, 2025

Awesome product!

Chautbreland Z Verified Purchase

Tempest Spark Plug UREM40E
March 10, 2025

The new plugs checked out just fine and are on my R-540 Kinner!!!!!

Ernest W Verified Purchase

Tempest Spark Plug UREM40E
March 10, 2025

Stefan B Verified Purchase

Tempest Spark Plug UREM40E
March 4, 2025

Steve B Verified Purchase

Tempest Spark Plug UREM40E
February 21, 2025

Have not run them yet, however have had good performance from Tempest in the past

Harold B Verified Purchase

Tempest Plug UREM40E 12 Pack
February 19, 2025

Q&A

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Please note, Aircraft Spruce ®'s personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce ® assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Does Tempest provide the copper gasket on the UREM40E? Or purchased separately?

Each Tempest spark plug will come with one copper gasket. Any additional gaskets must be purchased separately.

Q: Is the Tempest UREM40E the equivalent of the Champion REM40E? I hope so as I have just ordered 8 UREM40E's?

Yes, the Tempest UREM40E is a direct replacement for the Champion REM40E. Both with work in the same applications.

Q: What size copper gasket is required with the Tempest UREM40E plugs, 14 or 18mm?

18mm

Q: The Champion chart calls for a REM40E in a Continental W-670 while Tempest calls for a UREM38E. Why does Tempest call for a colder plug in the same application?

The heat ranges actually overlap each other. You can use either one.

Q: What size is the UREM40E? 5/8 or 3/4 ?

5/8 inch.

Q: Is a fine-wire plug available for the UREM-40E?

UREM38S is the fine wire version of UREM40E.

Q: Does the Tempest UREM40E gap come pre-set?

Yes, these will come pre-gapped within a certain range. The end user will need to verify with their application on what gap they are actually needing. The massive plugs are gapped .016" to .021" and the fine wire are .017 to .021".

Q: Are Tempest UREM40E spark plugs identical in dimensions as the Champion REM40E? The cowling has bump outs for the spark plugs so the dimensions are critical for proper clearance.

Yes, the physical dimensions are the same for both brand plugs.

Q: Are these Tempest UREM40E plugs considered "Long reach" spark plugs?

These are not. UREM37BY would be considered long reach.

Q: Are all the Tempest spark plugs direct replacements for the Champion plugs minus the leading U on the part number. ( is a UREM38E, a direcct replacemet for the Champion #REM38E?)

Yes, they are equivalent applications and interchangeable.

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