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 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.

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.

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.

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.