Great product, wish they would come in a 8 pack though.

John H Verified Purchase

TEMPEST PLUG UREM37BY 12PK

Perfect plugs for my Jacobs R755 Stearman.

John T Verified Purchase

TEMPEST SPARK PLUG UREM37BY

Replaced REM40 with these. Runs fine. Ask me in a couple years. 😊

Perry R Verified Purchase

TEMPEST PLUG UREM37BY 12PK

Much needed in the Champ due to top cowl wire clearance.

Jeff W Verified Purchase

TEMPEST SPARK PLUG UREM37BY

All good so far

Sid E Verified Purchase

TEMPEST SPARK PLUG UREM37BY

This was a perfect replacement for the one that I dropped. :-)

Paul A Verified Purchase

TEMPEST SPARK PLUG UREM37BY

Excellent

Todd H Verified Purchase

TEMPEST SPARK PLUG UREM37BY

Engine is running smoother with no fouling - highly recommend!

John B Verified Purchase

TEMPEST SPARK PLUG UREM37BY

This plug is much much longer than the 40E so even though the guide says it will fit, I am too chicken to try it

Daniel B Verified Purchase

TEMPEST SPARK PLUG UREM37BY

Good bottom plug for my lycoming, more resistant to lead fouling. Happy with them.

Stephan F Verified Purchase

TEMPEST SPARK PLUG UREM37BY

Have used these igniter previously, after using a set of Champion Igniters Im going back to Tempest, Its a higher quality product.

Mark S Verified Purchase

TEMPEST SPARK PLUG UREM37BY

the right spark plug for O235

Soframo Verified Purchase

TEMPEST PLUG UREM37BY 12PK

I installed the UREM37BY in my 0200 Continental and 0320 A1A engines and never had a miss since. Happy with them so far.

The best spark plug after the iridium ones. The exposed electrodes ignites the fuel mixture easily.

Lewis M Verified Purchase

TEMPEST SPARK PLUG UREM37BY

Very short delivery time to europe

Benno B Verified Purchase

TEMPEST PLUG UREM37BY 12PK

ENGINE OIL DIP STICK TUBE GASKET FOUND LEAKING, NEW GASKET INSTALLED AND TUBE WIRE LOCKED.

Safari E Verified Purchase

TEMPEST SPARK PLUG UREM37BY

Recommended by our mechanic.

Robert Verified Purchase

TEMPEST SPARK PLUG UREM37BY

Works good, doesn’t foul even on bottom side of new cylinders with all that oil and junk in there while it’s wearing in.

Kristopher W Verified Purchase

TEMPEST SPARK PLUG UREM37BY

Are about the same length as the champion rem40e they replaced. Great for tight spots.

Chad H Verified Purchase

TEMPEST SPARK PLUG UREM37BY

WE HAD BRAND NEW CHAMPS AND THEY WERE NO GOOD RIGHT OUT IF THE. BOX

Good product but took a long time to receive.

Brand new, gaps set perfectly!

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.

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.

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

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

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

In my opinion they hold up better than champions.

I like the quality and performance of the Tempest Spark Plugs best. My last set were the Tempest Massive Electrodes that I switched to from the Champion Brand because of radio noise which went away with the Tempest Plugs. My current set for my RV9A are the Tempest Fine Wire Plugs. They too are radio quiet and give great performance.

I replaced my defective Champion plugs with these, and they work great. Although I hear that Champion has fixed their resistor problems, their denial of a problem (and silence on their fix for it) have made me a Tempest fan!

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!

Great spark plug! I rarely have to replace these before they’re worn beyond spec. I highly recommend tempest spark plugs

I replaced six lower plug on TIO 540. The plugs prior to replacement were new massive plugs, however it was prone to lead fouling after less than 10 hours of flight. I lean it aggressively but unforgiving lead has set plug #4 & #6 foul up. The fine wire in my belief is a must on larger lycoming or continental engine. Highly recommend the fine wire plugs, price is worth it. In my opinion it will pay for itself. I am a Tempest convert now.

There are 12 spark plugs x 2 engines in a Seneca. Had Champions before replacing all the plugs with these winners. No hard starts, no fouling and they look very cool with the stainless bodies. The bonus is lower cost to buy and better fuel economy.

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

A recent mag and harness change had my plug wires up against the top cowl on my A-65. These Tempest UREM37BYs are about a half inch shorter than the Champion REM40Es they replace. Yippie! NO cowl blister needed! I have read they are less prone to lead fouling and can net more hp. Id give 10 stars if I could.

Certified for and a great plug for Lycoming O360. All resistances were between 995 and 1300 ohms. Gaps checked good, no adjustments needed.

We use these plugs in our Pratt and Whitney R1340 engines and have very good luck with them. I highly recommend them to anyone.

Good Buy

I always buy Tempest spark plugs. Nickel coating, resistors that are superior and at competitive priceing I WILL consider any Tempest product before others..

Thanks for the great service. The Tempest plugs arrived on time and as advertised. Im pleased not only with their performance but also with their polished appearance which makes the engine look great.

Thank you for compiling this list!! Great time saver for us Tomahawk pilots looking for a quick list of parts they may consider replacing, especially when their parts manual isn't handy. Great list so far!

I've had fine where plugs in my Grumman Cheetah 0320 for about two years, they really work well and I always get the same mag drop with the upper or lower plugs. While they work perfectly, the exterior of the plugs corroded excessively. I mentioned this to Brian Cox at the Tempest booth at Sun n fun, he said for a short while they had an issue with their plating vendor. I sent him some pictures and the date codes, and I just received a completely new set of plugs! This type of customer service is remarkable-I will remain a staunch Tempest customer.

They work fine in my application, RV6 and Long Ez. I wish they were priced like auto plugs though!

David S Verified Purchase

TEMPEST PLUG UREM37BY 12PK

Nice Spark Plugs bought with new Kelly Harness My birds starting quicker and running smoother now. The Fit and Finish of these nickel plated plugs is very good.

great spark plugs but too expensive. Also, I wish there was a better and inexpensive way to figure out the spark plugs condition etc...

Good value for money

Plane runs well so far. Had to regap a few plugs out of the box. Quality control by Tempest?? Lost confidence in Champion after their spark plug resistance issue and magneto point redesign. Hopefully Tempest wont go the same way with their quality control.

performs as advertised.

11 of the 12 plugs had scratches / gouges in the ceramic insulator where the lead goes in.