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NGK Iridium OR Ac Delco Iridium Spark Plugs..

This is a discussion on NGK Iridium OR Ac Delco Iridium Spark Plugs.. within the External Engine forums, part of the LSx Technical Help Section category; Originally Posted by {FzS}BlacKMagicK and if they last longer, doesn't that mean more money for mods? Not really. The price ...

  1. #21
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by {FzS}BlacKMagicK View Post
    and if they last longer, doesn't that mean more money for mods?
    Not really.

    The price of the iridiums is about 3x as much as the coppers last I checked.
    They last about 2 1/2 times longer as I understand it.

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    Formulatastic yellowv's Avatar
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    Quote Originally Posted by Wesman View Post
    So whats the advantage of running copper then?? Why not just use the Iridiums so that you don't have to change them nearly as often??

    That makes no sense to me at all.
    Because guys that run at the track a lot like to check their plugs a lot. I know I do especially if you spray. I would rather a brand new set of coppers any day over a set of iridiums with 20,000 miles on them that are supposedly good as new any day. Like I said changing plugs isn't a big deal to me. Not much more than changing oil.

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    Member {FzS}BlacKMagicK's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    Not really.

    The price of the iridiums is about 3x as much as the coppers last I checked.
    They last about 2 1/2 times longer as I understand it.
    I was going by what Summit says about them being good for a minimum 100 thou, and how the avg, copper plug should have been changed four times.

    ACDelco iridium spark plugs are the latest evolution in high performance plugs. The natural properties of iridium, with a melting point of approximately 700 degrees Celsius higher than platinum, help enable the plug to burn fuel more efficiently and to deliver better performance. As a result, the iridium plugs have a minimum service life of 100,000 miles (service life varies with individual driving conditions.) Since iridium is one of the densest materials found on earth, the iridium-tipped center electrode is 50 percent the size of a platinum electrode, and 20 percent the size of a conventional nickel electrode. The secondary micro-discharge of the center electrode burns off carbon deposits as they form, for superior anti-fouling performance that, along with the tapered cut-ground electrode, offers enhanced flame spread during combustion. The specially designed electrodes increase the electric field strength at the gap, reducing the voltage required for sparking to begin, for improved cold starting and quicker acceleration. The application coverage of ACDelco iridium spark plugs continues to grow, with the plugs being backed by a 100,000-mile limited warranty."
    In that same mileage the average copper plug is supposed to have been changed 4 times.
    Going by that you would have spent $76.48 vs. $55.60 and have had to change your plugs four times.
    You would have saved $20.88

    If you go NGK Platinum it's $95.68 vs. $55.60 and you saved $40.08 and not had to have changed your plugs four times.


    If you go by what yellowv was saying about guys he knows who track run changing them every 15,000...
    you get $133.84 vs. $55.60 and a savings of $78.24 if they use NGK Platinum it's $167.44 vs. $55.60 and a savings of $111.84 and...they changed their plugs seven times.

    To me, it's an obvious choice. What's the biggest concern with a spark plug?

    Fouling. It fouls...it's dead...no cylinder...less power...perish the thought.

    I would reccomend taking 'em out after twice the life of the avg. spark plug and just inspect them, if their good, put 'em back in.
    Last edited by {FzS}BlacKMagicK; 09-03-2007 at 01:03 PM.

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    Slow'er'Ass Mr. Luos's Avatar
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    You did WAY too much math there.

    No plug should go 100,000 miles. I don't care what GM says.

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    Member {FzS}BlacKMagicK's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    You did WAY too much math there.

    No plug should go 100,000 miles. I don't care what GM says.
    I know, I think I hurt myself, I need a an icepack and a beer.



    What I like about them is if their rating them at 100,000 it's mostly due to their anti-fouling properties,
    which at the very least, it rates really high in that department, so even if you were to change them...IDK...say every 30 or 40,000 I don't think that would be killing anyone's wallet.

    Especially when we are stomping on these cars so much, if you have a stock motor,
    let's face it, GM rings are not famous for being the best.

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    back 'n better than ever Kjz99z28's Avatar
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    What is the proper gap for our plugs?

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by Kjz99z28 View Post
    What is the proper gap for our plugs?
    0.55" is factory spec.

    Gap changes per plug though as well.
    I think I have my TR6's at .042".
    Ran the TR55's at .048".

  8. #28
    back 'n better than ever Kjz99z28's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    0.55" is factory spec.

    Gap changes per plug though as well.
    I think I have my TR6's at .042".
    Ran the TR55's at .048".
    I'm still trying to decide on plugs.. but what if I'm going with the AC Delco Iridiums?

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    Slow'er'Ass Mr. Luos's Avatar
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    I am thinking .052" would work nicely.
    But wait for someone who runs them chimes in.

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    back 'n better than ever Kjz99z28's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    I am thinking .052" would work nicely.
    But wait for someone who runs them chimes in.
    Thanks for the help!

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    Member {FzS}BlacKMagicK's Avatar
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    Wasn't there a bulletin saying to reduce it to .40?

    I checked one site for ACdelco Iridiums for my car and they are pregapped to .040

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    back 'n better than ever Kjz99z28's Avatar
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    Nevermind.. looks like the AC Delco iridiums aren't much cheaper... so if I go with NGK.. what exactly do I need? I am new to actually paying attention to plugs and gapping.

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    Member {FzS}BlacKMagicK's Avatar
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    Quote Originally Posted by Kjz99z28 View Post
    Nevermind.. looks like the AC Delco iridiums aren't much cheaper... so if I go with NGK.. what exactly do I need? I am new to actually paying attention to plugs and gapping.
    What do you need? Just buy the plugs and install them, they should be pre-gapped for your car.

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    back 'n better than ever Kjz99z28's Avatar
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    Quote Originally Posted by {FzS}BlacKMagicK View Post
    What do you need? Just buy the plugs and install them, they should be pre-gapped for your car.
    Yeah I get that... but NGK offers different plugs, and I'm wondering what is best for my car.

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by {FzS}BlacKMagicK View Post
    What do you need? Just buy the plugs and install them, they should be pre-gapped for your car.
    Never trust the pre-gap.
    Always double check and get them all the same.

    NGK TR55's are what you need.
    NGK part number 3951.

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    Those are copper aren't they?

    I thought she wanted Iridium, the Iridium spark plugs for your car by NGK are Part# NGK-7164

    Go to Summitracing.com to get 'em...warning...they aren't cheap.

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    back 'n better than ever Kjz99z28's Avatar
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    Quote Originally Posted by {FzS}BlacKMagicK View Post
    Those are copper aren't they?

    I thought she wanted Iridium, the Iridium spark plugs for your car by NGK are Part# NGK-7164

    Go to Summitracing.com to get 'em...warning...they aren't cheap.
    I'm open to whatever plug right now, I'll pay if it'll last me a while.

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    Member {FzS}BlacKMagicK's Avatar
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    Quote Originally Posted by Kjz99z28 View Post
    I'm open to whatever plug right now, I'll pay if it'll last me a while.

    Boy, that line could be taken a lot of ways, I won't touch that right now.




    Well, as you can see from this thread, the iridiums last a lot longer, and are supposed to be more foul resistant, they are a lot higher in price though, and some feel that they would just rather change them more often and go with plain ol' copper, so I'm afraid your going to have to decide for yourself, what your more comfortable with. In the long run it would cost you less though.

    There are strong arguments for both.

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    back 'n better than ever Kjz99z28's Avatar
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    Quote Originally Posted by {FzS}BlacKMagicK View Post
    Boy, that line could be taken a lot of ways, I won't touch that right now.



    Well, as you can see from this thread, the iridiums last a lot longer, and are supposed to be more foul resistant, they are a lot higher in price though, and some feel that they would just rather change them more often and go with plain ol' copper, so I'm afraid your going to have to decide for yourself, what your more comfortable with. In the long run it would cost you less though.

    There are strong arguments for both.
    Cost less for which? Sorry it's late and I'm confused. I don't really mind changing them, it's just finding the time, someone's driveway to borrow, and tools each time I want to do it. So copper vs iridium.. how much time difference between each change are we talkin?

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    Member {FzS}BlacKMagicK's Avatar
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    Quote Originally Posted by Kjz99z28 View Post




    Cost less for which? Sorry it's late and I'm confused. I don't really mind changing them, it's just finding the time, someone's driveway to borrow, and tools each time I want to do it. So copper vs iridium.. how much time difference between each change are we talkin?
    Iridium claim to be good for a 100,000 miles, copper around 25,000

    Are you planning on doing this yourself?
    Don't know if I would recommend that, not that you couldn't it's just it can be a real pain in the ass.

    The copper plugs are much cheaper two dollars and change vs. seven and change for the Iridiums.
    That's in the NGK line, the ACdelco Iridiums are I think around a buck cheaper.

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