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Re: iridium plugs. do they make a difference [Re: NO2] #5179317 08/05/19 06:48 AM
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Originally Posted by NO2
Ruthenium plugs seem to be the most economical choice. According to the press releases they last 20-40% longer than iridium.


Double platinum, let alone iridium, are already good for 100k. Not really sure how Ruthenium will be better unless you are trying to hit 200k on them. And I can count on one hand the people that keep their cars 300k, since most factory plugs are good till the 100k service.


yup
Re: iridium plugs. do they make a difference [Re: WhyMe] #5181333 08/07/19 06:03 PM
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Many people with vehicles that spec copper plugs have changed to iridium or platinum simply because the plugs are difficult to access and they want to change them less. The iridium/platinum plugs simply keep the proper gap longer, and so can stay in the engine longer. So no, there is no benefit other than longevity. Copper does conduct better but most people will never notice any change in performance.


1995 Corvette coupe LT1 6-speed
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Re: iridium plugs. do they make a difference [Re: WhyMe] #5181402 08/07/19 07:10 PM
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Originally Posted by WhyMe
performance wise? besides the long life, are there any other benefits of running an iridium plug? could i pick up performance by using a platinum or copper plug in my vehicles?


For the same tip size probably not. However, with a more durable material they can also make the center electrode smaller, and therefore reduce misfires and lower the needed firing voltage, this always help.

You can make a typical 1.1mm platinum tip, but not 0.7mm like Iridium.


"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: iridium plugs. do they make a difference [Re: WhyMe] #5183118 08/09/19 07:34 PM
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prolly less performance with cheap $2 copper plugs but due difficulty of changing the harder longer lasting poor conducting exotic metals are popular, surely not their price but paying to install difficult plugs iridum makes dollars + sense!

Re: iridium plugs. do they make a difference [Re: PandaBear] #5183197 08/09/19 09:15 PM
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joemo Offline
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Don't take my word. Put iridium plugs in your lawn mower and see it start easier and use less gas.


2000 Regal GS 130 k 5w30 phillips synthetic blend 1992 club car castrol 0w40
Re: iridium plugs. do they make a difference [Re: WhyMe] #5183202 08/09/19 09:26 PM
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While the iridium and platinum plugs last longer, they don't provide any benefit for power nor mpg. My engines run just the same on cheap $3 conventional plugs. I find myself having to pull the iridium plugs every 30-40k miles to reset the gap anyway so I switched to conventional plugs. Our race engines run on a $3 conventional NGK plugs.


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: iridium plugs. do they make a difference [Re: WhyMe] #5183561 08/10/19 11:15 AM
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I liked the fine tip design for the Denso TT plugs and have installed them quite often up until now, but the set of 4 Denso Iridium TT that I installed 2.5 years ago in a 2011 Kia Soul 2.0L were COMPLETELY worn out after 50k miles, so please be aware that these fine tip precious metal plugs may perform well when new, but they are definitely susceptible to accelerated erosion due to various factors. One reason in this case may be due to this engine having only 2 ignition coils, which means that the plugs fire twice as often as COP design due to a wasted spark on every exhaust stroke. I noted on cylinders 1 and 4 that the center electrode had worn down to the ceramic while the ground side fine tips still looked good. However, on cylinders 2 and 3, the center electrode still had a recognizable point, and instead the ground electrode fine tip was completely worn to nothing. The engine was misfiring whenever accelerated just beyond normal acceleration. I replaced these completely worn plugs with the original design NGK double platinum LASERS and a new set of quality wires and now it runs like new again. When I replaced the original plugs they were not really worn and were only replaced as a normal maintenance item. The car was actually still running well.

I had fully expected to get a full 100k miles from the Denso Iridium TT's since they are supposedly high quality iridium, and iridium plugs are usually considered long life. But now I am seeing that some iridium designs are WAY LESS durable than others. If I had decided to run the Denso Iridium TT's again in this engine, they would need replaced again in no more than 40,000 miles. The car currently has 163,000 miles and the originals were replaced around 110k miles.

I contacted Denso Technical support about my experience and the guy I talked to was totally uninterested in seeing or discussing my results with their iridium TT plugs. I was as always very polite, but his final comment before hanging up on me was "good luck". Apparently "good luck" is what is needed when using their products. I will move to another brand, thank you.

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