So You Just Have To Have Iridium Spark Plugs eh? - Page 2 - Toyota Yaris Forums

devinlamothe · 04-03-2012, 04:04 PM

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 · 04-10-2012, 12:43 AM

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 · 04-10-2012, 02:09 AM

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

firemachine69 · 04-10-2012, 02:13 AM

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 · 04-12-2012, 08:16 PM

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 · 04-12-2012, 08:46 PM

An engine is an engine.

why? · 04-13-2012, 12:18 AM

Quote:

Originally Posted by bronsin

An engine is an engine.

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

fnkngrv · 04-13-2012, 02:39 AM

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 · 04-17-2012, 10:50 AM

Quote:

Originally Posted by 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.

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 · 04-17-2012, 12:10 PM

Quote:

Originally Posted by curtmaxwall

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 · 04-17-2012, 12:34 PM

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? · 04-17-2012, 12:46 PM

especially considering the revs a typical modern motorcycle puts out.

SAV912 · 04-17-2012, 01:28 PM

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 · 04-17-2012, 01:38 PM

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 · 04-17-2012, 03:14 PM

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.

04-03-2012, 04:04 PM	#19
devinlamothe Drives: '07 Yaris HB Join Date: Apr 2006 Location: Sudbury, Canada Posts: 520	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. __________________

04-10-2012, 02:09 AM	#21
fnkngrv Mr. 155 and climbing View User's Garage Drives: Seriously Modded 07 Sedan Join Date: Jun 2006 Location: In The Hotbox Posts: 4,742	Anybody care to have me post up my Iridiums I pulled? __________________ Team Tiamat Racing on Facebook Youtube Channel: Team Tiamat Racing *Class record holder in Land Speed @ 154.5mph for 1.5 mile and 145.5mph in the mile in the F (2.016 to 3.014 L), G (1.524 to 2.015 L), and H (1.016 to 1.523 L) classes.*

04-12-2012, 08:46 PM	#24
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,784	An engine is an engine. __________________ Synthetic Oil: Its All In Your Head

04-13-2012, 02:39 AM	#26
fnkngrv Mr. 155 and climbing View User's Garage Drives: Seriously Modded 07 Sedan Join Date: Jun 2006 Location: In The Hotbox Posts: 4,742	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. __________________ Team Tiamat Racing on Facebook Youtube Channel: Team Tiamat Racing *Class record holder in Land Speed @ 154.5mph for 1.5 mile and 145.5mph in the mile in the F (2.016 to 3.014 L), G (1.524 to 2.015 L), and H (1.016 to 1.523 L) classes.*

04-17-2012, 12:34 PM	#29
ilikerice Drives: 2010 black yaris Join Date: Oct 2010 Location: savannah, ga Posts: 2,868	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. __________________ -Derrick- "Racing is important to men who do it well. When you're racing... It's life. Anything that happens before or after, is just waiting."

04-10-2012, 12:43 AM	#20
firemachine69 School'er of hard knocks Drives: Silver Yaris 4dr. HB Join Date: Oct 2008 Location: Sudbury, On Posts: 556	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!!!!

04-10-2012, 02:13 AM	#22
firemachine69 School'er of hard knocks Drives: Silver Yaris 4dr. HB Join Date: Oct 2008 Location: Sudbury, On Posts: 556	Give'er. If I weren't essentially driving my car (which is practically the dealer's now), I'd pull mine and check, too.

04-12-2012, 08:16 PM	#23
Happy Little Pony Drives: 2007 Yaris HB Join Date: Dec 2009 Location: Tampa, FL Posts: 83	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.

04-17-2012, 12:46 PM	#30
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	especially considering the revs a typical modern motorcycle puts out. __________________ Colin Chapman disciple

04-17-2012, 01:28 PM	#31
SAV912 Pirate Yaaaaris View User's Garage Drives: '00 Toyota Celica GTS 6MT Join Date: Aug 2009 Location: Savannah, GA Posts: 573	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 __________________ Georgia Bulldogs! '09 Yaris LB 5MT Sold.

04-17-2012, 01:38 PM	#32
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,784	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. __________________ Synthetic Oil: Its All In Your Head

04-17-2012, 03:14 PM	#33
ilikerice Drives: 2010 black yaris Join Date: Oct 2010 Location: savannah, ga Posts: 2,868	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. __________________ -Derrick- "Racing is important to men who do it well. When you're racing... It's life. Anything that happens before or after, is just waiting."

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