Spark plugs suggestion

[sickpuppy1]

Well, I believe RedRide is acccurate to an extent, plugs do go bad and they do get weaker over age. I wont dispute that. But I think it more due to quality of materials used and other factors such as fuel quality and driving style. My comment earlier about how we used to change points, plugs cap and such was true to because of the factors I just mentioned. Back when plugs were copper only they DID wear out since the copper was ate away by they constant sparking eating away at the metal. inefficient burning of fuel due to old school carburetors caused them to get carboned up quickly. I just think that with the increase in material quality of the plug, better control of fuel due to EFI and electronics and moderation of driving style (saving fuel) that Iridium plugs can go 100k with a very minimal lose of spark integrity. Which is not to say that there isnt some lose of spark quality over that time, but the amount is so small that a daily driver scenario wouldn't perceive the difference. If someone is doing rally driving or something, they would be more inclined to notice it I would think.

[RedRide]

Originally Posted by sickpuppy1

Well, I believe RedRide is acccurate to an extent, plugs do go bad and they do get weaker over age. I wont dispute that. But I think it more due to quality of materials used and other factors such as fuel quality and driving style. My comment earlier about how we used to change points, plugs cap and such was true to because of the factors I just mentioned. Back when plugs were copper only they DID wear out since the copper was ate away by they constant sparking eating away at the metal. inefficient burning of fuel due to old school carburetors caused them to get carboned up quickly. I just think that with the increase in material quality of the plug, better control of fuel due to EFI and electronics and moderation of driving style (saving fuel) that Iridium plugs can go 100k with a very minimal lose of spark integrity. Which is not to say that there isnt some lose of spark quality over that time, but the amount is so small that a daily driver scenario wouldn't perceive the difference. If someone is doing rally driving or something, they would be more inclined to notice it I would think.

Thank you.

As sickpuppy alluded to,........
It comes down to how performance oriented a driver is. Granted, the average driver who used it as grocery getter, etc would not notice any performance decrease.

However, like I said, there are reports of plugs seizing up in after leaving them in for 100k mille.
So, some on other forms are recomending removing and at least inspecting them after about 50k miles.

Also, why replace them after 100k mles? Is that some sort of magical number that sudenly makes a plug go bad or, do they deteriorate gradually over their life ?

I challange anyone to show me a dyno report that shows that performance is exactly the same with new plugs and with plugs with over about 75k miles on them.

[ddongbap]

Also, why replace them after 100k mles? Is that some sort of magical number that sudenly makes a plug go bad or, do they deteriorate gradually over their life ?

So what you're saying is the smart people with tons of money who work at these companies are just saying 100k miles cause they decided to pull that one out of the air?

I challange anyone to show me a dyno report that shows that performance is exactly the same with new plugs and with plugs with over about 75k miles on them.

I challenge you to show me a Yaris dyno report that shows SIGNIFICANT power loss due to older plugs.

[RedRide]

Originally Posted by ddongbap

So what you're saying is the smart people with tons of money who work at these companies are just saying 100k miles cause they decided to pull that one out of the air?

No, you are the one saying that they just pulled a nmber out of thin air.

Originally Posted by ddongbap

I challenge you to show me a Yaris dyno report that shows SIGNIFICANT power loss due to older plugs.

You first have to define "SIGNIFICANT".
Now, you seem to be basically argeeing with me but, just discussing definitions.