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Tempest Iridium Fine Wire Spark Plug UREM38S

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Single Plug Box of 12 Plugs
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Overview

FINE WIRE 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.
   
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

Application Guide

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Reviews

Valley A Verified Purchase

Tempest Spark Plug UREM38S

November 15, 2024

These are good plugs however at over $300 each after shipping and tax, I believe that massive electrode plugs are more cost effective if you clean them more frequently. I have been using these fine wire plugs since 2016 and havent experienced a big enough difference to justify the price.

David K Verified Purchase

Tempest Spark Plug UREM38S

April 17, 2024

Pricey but worth it. Cost even for the number of times to replace massive electrode types due to long life. Much better ignition for marginal (lean) mixtures

David P Verified Purchase

Tempest Spark Plug UREM38S

February 27, 2024

I like Tempest plugs in general as they tend to have better resistance values than Champions. However, the wrenching on tempest plugs are lower on the plug than Champions and this presents a problem when utilizing spark plug gasket CHT probes. There is interference between the wrenching and the wall of the counterbore for the spark plug on Lycoming engines. I have had to utilize a champion plug in that instance.

Gary S Verified Purchase

Tempest Spark Plug UREM38S

November 11, 2023

Arrived properly gapped and with normal resistance

William H Verified Purchase

Tempest Spark Plug UREM38S

November 10, 2023

White B Verified Purchase

Tempest Spark Plug UREM38S

August 22, 2023

After having fowled plugs and so many issues, I received recommendations for these plugs from many pilots. Although I though it was crazy to spend this kind of money for plugs, in the long run it has saved many headaches and reduced the cost of hiring an A & P to keep servicing the old plugs.

Leslie L Verified Purchase

Tempest Spark Plug UREM38S 12 Pack

March 10, 2023

White B Verified Purchase

Tempest Spark Plug UREM38S

July 6, 2022

Long life and reliable.

Milon W Verified Purchase

Tempest Spark Plug UREM38S

June 19, 2022

Peter T Verified Purchase

Tempest Spark Plug UREM38S 12 Pack

May 19, 2022

Q&A

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: Which spark plug socket will work with this longer spark plug?

Per our tech: The ATS socket should work fine, part number 12-01693. This is a pretty common size spark plug for aviation engines.

Q: When I add UREM38S to my shopping cart it changes the plug # to UREM38S XL. What does the XL stand for and is the plug longer than the massive plug # UREM38E?

No, XL just denotes that it is an iridium fine wire plug. It is not any longer than the UREM38E and will not rub on your cowling.

Q: Application chart shows 5/8 and 3/4 thread - ordering info for UREM38S doesnt seem to indicate which is shipped. When ordered which plug thread is shipped?

UREM38S is a 5/8"-24 plug. If you order UREM38S, you will get a 5/8"-24 plug.

Q: What size of gasket is used for this Tempest plug UREM38S?

This plug comes with an 18mm copper gasket.

Q: If I change to fine wire plug, do I need to change harness?

No, the harness does not need to be changed when switching to fine wire plugs. If your regular plug is an UREM38E for example, you can make the direct switch to UREM38S.

Q: Can I mix fine wire and massive plugs in an engine? Massive on top fine wire on bottom?

Yes, you can do this. People typically run the fine wires on the bottom if they are having fouling issues.

Q: What gap are these plugs pre-set to?

They are gapped .017"-.021".

Q: We have a Continental IO-550 Turbo engine, in our Cirrus SR22T. What model of Tempest Iridium plugs should we buy?

Per the application guide, which should only be used a reference and it is always best to check the currently installed plugs to determine the replacement, the IO-550 can take the URHB36S or URHB32S.

Q: What is the difference between URHB32S and URHB36S. The specs show 3/4-20 with 13/16 reach. I am researching replacing the massive electrodes for fine wire plugs for a Continental IO470S.

The URHB36S is just a hotter burning plug than the URHB32S. Either can be used on your engine.

Q: I currently have massive UREM40E installed in my Lycoming IO-540-T4B5. I want to change the bottom plugs to fine wire UREM38S. Is this the correct replacement plug, and will I need to change the harness?

Yes, UREM38S is the correct plug.

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