So You Just Have To Have Iridium Spark Plugs eh?

[bronsin]

Here are sparkplugs out of identical four cylinder engines. The ones on the left are iridiums with 30k on them the ones on the right conventional plugs with 70k.

Note the slender electrode of one of the irids is totally worn away. The other three were normal.

Both owners reported normal operation and gas mileage.

Are Iridium plugs another thing to waste your money on like synthetic oil?

You decide.

[Betrivent]

They aren't identical plugs though, and I see both plugs on the right are worn out? This isn't exactly an objective test. That being said, I also believe that running strictly iridium plugs is kind of silly. A spark plug is a spark plug. If it works, it works.

[Sparcoboy]

Believe me, a spark plug ain't a spark plug. With the wrong plugs you can blow a hole in your piston within a few 1000 miles!
As for iridium spark plugs, I don't like them that much, conventionel ones are good enough for a Yaris. When you start racing with fully prepped engines you're talking about different things :d

[fnkngrv]

I have had several folks from the racing circuit that I am in say that with a boosted application to go with regular plugs so that is what I have done.

[bronsin]

That electrode on the irid was just eaten away!

Unbelievable!

[bronsin]

They aren't identical plugs though, and I see both plugs on the right are worn out? This isn't exactly an objective test. That being said, I also believe that running strictly iridium plugs is kind of silly. A spark plug is a spark plug. If it works, it works.

They are worn alright but the owner reported his engine was running fine and he didnt think he needed to change the plugs.

Maybe he didnt. Maybe with electronic ignition they would work forever.

[why?]

just like your total irrational hatred of synthetic oil this simply isn't an argument with any merit. You need different tools for different jobs. There is not one answer for everything, and there never will be. You could easily say it is pointless to own a Yaris, as a Yugo could do the same thing.

[bronsin]

Hmm the center electrode of the irid plug is wasted. And after only 30k miles. Im completely objective here. This doesnt look good.

I dont hate synthetic oil. It great if the outside temperature is 0 or below. Or in turbine engines for which it was developed.

Since it doesnt improve mpg or make the engine last longer and it costs a lot more money and according to the owners manual it has to be changed just as often to keep the warranty in effect whats the advantage?

I know its my attitude isnt it? :drinking:

[daf62757]

I switched to both and have seen increased gas mileage and power. I did see a loss in mileage a few months ago and bought new I plugs and they were hardly worn. Not sure where you got these photos but based upon my pulled plugs, I don't think the photo is accurate.

As for Syn Oil, it does provide better lubrication and protection, especially when starting the car. The lower viscosity levels do provide marginally better gas mileage so not sure were you dreamed up your prejudice for it or the plugs, but you on an island with all this ranting.

But on the positive side, it gets people's heat pumping so you did provide some benefit here.

[bronsin]

They say seeing is believing. There were 30 people working on their ST1300 motorcycles together and those plugs came from two of those bikes. They got passed around and commented on. The people who had installed iridium plugs had lots of second thoughts as to what their next set of plugs would be.

I just call things the way I see them. If Im wrong or theres something Ive missed I have no problem hearing about it. I welcome any person who has evidence to the contrary to change my mind. I would only benefit by doing something that was better than what Im doing now.

Im sorry if I appear to be stepping on some peoples toes. I hope others who have not said anything will benefit by my line of reasoning.

Everyone is welcome to join me on my island anytime, no questions asked!

Here are some more opinions you might want to read:

People driving cars that get 20 mpg are out of their minds and need to buy cars like the Yaris.

I buy Toyotas because quality is cheaper, less trouble, and more beneficial in the long run.

My 09 Yaris needed a new water pump at 27k miles and if Toyota doesnt do something about these pumps going bad I will consider buying another better, more reliable brand of car.

[WeeYari]

Why do people get so bent out of shape in a Food-for-Thought thread an attack the OP!

This is an open discussion about plugs, not character.

[suckerface]

What was the difference in driving style between the two setups? I'd imagine that may have an impact, as well as care, storage, etc.

[bronsin]

Not sure really. I dont suppose this is common though or people wouldnt buy irids. The redline for those engines is ~ 8500 which is pretty low for a motorcycle. The guy who engine the plugs came out of swore he did didnt do anything out of the ordinary...

[DMZ]

I pulled the IR plugs from my '05 Tundra at 82K. They looked fine. I replaced them with IR plugs, as per manufacture's recommendation.

I pulled an IR plug out of my '07 Yaris at 50K. It looked fine. Decided to wait another 30K until I replace them.

[bronsin]

I think thats whats in my wifes 05 Camry and it has ~80k on it now. I havnt had them out yet and am a little worried about them getting seized...

[DMZ]

I think thats whats in my wifes 05 Camry and it has ~80k on it now. I havnt had them out yet and am a little worried about them getting seized...

Pull one out for a little looksee. Replace (might as well) with copper($3, 30K), platinum($5, 60K), or IR($7, 100K). Put a dab of anti-seize on the thread and some di-electric grease on the tips.

[fnkngrv]

I pulled my OEM iridiums at roughly 70k. I will take a photot or two and post up. Mine are tinted orange, but that is because of the Octane boost. Mine also have roughly 13k on them boosted to 7/8lbs.

[why?]

Hmm the center electrode of the irid plug is wasted. And after only 30k miles. Im completely objective here. This doesnt look good.

I dont hate synthetic oil. It great if the outside temperature is 0 or below. Or in turbine engines for which it was developed.

Since it doesnt improve mpg or make the engine last longer and it costs a lot more money and according to the owners manual it has to be changed just as often to keep the warranty in effect whats the advantage?

I know its my attitude isnt it? :drinking:

Yea, you're probably the only one who pays attention to what the owners manual said. Find a dealer that tried to not pay a warranty claim for that reason. You won't.

Synthetic can easily last 15,000 miles or more. That saves people money. It also means it protects better, which means it is safer to run.

And since it protects the vehicle better and most people would rather keep their car as long as they possibly could, it is a better choice.

Now since you obviously don't care about that logic, everything you say is suspect. You also probably believe maintaining your car is a waste of money. I really don't care about spark plugs, i drive my car for gas mileage, and so far i haven't seen any ads that say a certain spark plug will get better gas mileage.

[devinlamothe]

I've changed plugs twice already (100,000km between changes) and they looked nothing like that. They were a bit brown, but electrodes still looked fine. I could have left them in but I changed them any way.

I use Iridium just because that's what was there originally and it hasn't let me down.

Also I've already done what DMZ has suggested and put anti-seize on the threads.

[firemachine69]

The hotter they get, the faster they burn. Same as those "ultrabright" headlight bulbs. Trust me, you do NOT want to change those on a frequent basis!!!!

[fnkngrv]

Anybody care to have me post up my Iridiums I pulled?

[firemachine69]

Give'er.

If I weren't essentially driving my car (which is practically the dealer's now), I'd pull mine and check, too.

[Happy Little Pony]

I just replaced my Yaris' plugs even though I was "only" at 44,000 miles. They looked fine. The gap was still well within specifications. I won't replace mine that early again.

I don't know what an anecdote about the plugs people are using in their motorcycles have to do with what Toyota recommends for the completely unrelated Yaris. It's an apples vs. oranges argument.

[bronsin]

An engine is an engine.

[why?]

An engine is an engine.

you can't be serious........................................... ...........

[fnkngrv]

really when you look at the investment to replace plugs why is it a big deal to change them at 40-50k anyway if you want to? It cost me I think around 10 bucks.

[curtmaxwall]

Here are sparkplugs out of identical four cylinder engines. The ones on the left are iridiums with 30k on them the ones on the right conventional plugs with 70k.

Note the slender electrode of one of the irids is totally worn away. The other three were normal.

Both owners reported normal operation and gas mileage.

Are Iridium plugs another thing to waste your money on like synthetic oil?

You decide.

Iridium is one of the hardest, strongest and rarely available materials on the earth’s crust. Iridium is the best, but too hard to handle. Iridium is 6 times harder, 8 times stronger and can withstand temperatures exceeding 2454° C. It improves firing performance, smoother idling, improved engine performance and when accidental fire and misfiring rarely occurs under various driving conditions so we can say it decrease fuel consumption. So I can say its better, if you like.

[bronsin]

Iridium is one of the hardest, strongest and rarely available materials on the earth’s crust. Iridium is the best, but too hard to handle. Iridium is 6 times harder, 8 times stronger and can withstand temperatures exceeding 2454° C. It improves firing performance, smoother idling, improved engine performance and when accidental fire and misfiring rarely occurs under various driving conditions so we can say it decrease fuel consumption. So I can say its better, if you like.

Did you see the picture? The center electrode is trashed after only 30k miles.

How that happen?

Note the conventional plugs on the right. They are worn but the owner reported normal engine operation after 70k miles.

[ilikerice]

This is an intersting topic on spark plugs in motorcycles. But those are sparkplugs out of a motorcycle. Different driving habbits. I find this topic more for motorcycles then comparing to a DD car.

Also, You cant judge all Spark plugs on 4 you pulled out of 2 vehicles. give me 100 plugs pulled out of 50 motorcycles and then come back. Even if that Iridium plug was that bad, It still fired and worked fine apparently with normal gas milage and running condition. SOO, maybe the Iridium is worn, but not completely, and it is still firing like a champ.

[why?]

especially considering the revs a typical modern motorcycle puts out.

[SAV912]

So the OP has walked in with another rant about his vast knowledge of engineering, this time comparing iridium spark plugs from one motorcycle to conventional spark plugs from a different motorcycle, then lambasts those who use iridium spark plugs in their Yarii.

WTF.

Let's completely ignore the characteristics of a motorcycle engine that revs to 8500 when a Yaris tach doesn't even READ to that speed. Good info to relay, absolutely awful comparison and delivery. The Yaris never needed to be brought into this conversation.

-C

[bronsin]

All you got to do is explain where the end of the sparkplug went to.

Unlike you I allow others to make their own mind up.

[ilikerice]

out the exhaust is my guess..

I can't wait to read about the next tread installment of Prestone Yellow coolant VS. Toyota Red coolant.