Iridium Spark plugs
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Northstar Engines and System Technical Discussion Discussion, Iridium Spark plugs in Cadillac Engine Technical Discussion; Anybody tried the new AC Delco Iridium plugs in their Northstar, I know they are working out very well in ...
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    1997BlackETC's Avatar
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    Iridium Spark plugs

    Anybody tried the new AC Delco Iridium plugs in their Northstar, I know they are working out very well in my chevy colorado, thinking about trying them in my northstar. The idle is much smoother, better fuel economy too, longer life. The Iridiums just came not too long ago, I hear they are better than the platinums.

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    Re: Iridium Spark plugs

    I'm running the NGK Iridiums in my North* and it seems to like them just fine.

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    Re: Iridium Spark plugs

    I am interested in the feedback as well as I am getting ready to do a tuneup on my N*. Thanks in advance!

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    Re: Iridium Spark plugs

    My wifes '96 Bonneville (3800) is speced for and has Iridium plugs. Not quite sure what the difference is but I'd stick with what is spec'd.

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    Re: Iridium Spark plugs

    What about Splitfire http://www.ftc.gov/os/1997/05/c3737cmp.htm; and Blue Crown plugs.

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    Re: Iridium Spark plugs

    Great read, dkozloski were do you find this stuff?

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    Re: Iridium Spark plugs

    You ought to see the one the FTC put out about STP and Andy Granatelli. It resulted in the biggest consumer fraud fine in history; something like $668,000.

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    Re: Iridium Spark plugs

    The Iridium plugs do work great in my colorado, it idles smoother. They last even longer than the platinums too as they are even harder metal. Expensive though @# 11.00 per plug.

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    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Iridium Spark plugs

    The NGK Iridium spark plugs were recommended to me by the northstar guru...

    He knows I'm into performance, and he's the one who recommended running plugs 2 ranges colder...

    Splitfire is a joke, and so are the Bosch +2's 4's etc... Iridiums are NOT in the same league, or zip code, or world really... Iridiums have all the benefits of platinum spark plugs, which are stock on northstars - but - they have a finer electrode tip. This makes it easier for the spark to jump the gap. Comparing them to split fires is ignorant. You will never see split fires used in an OEM application. Iridiums are used in OEM GM applications. When the Chevrolet team designed the 500hp Z06 Vette, what plugs do you think they used? Iridium. 'Nuff said.

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    Re: Iridium Spark plugs

    Because iridium plugs have finer electrodes, the combustion gases can swirl around the insulator and keep the plug clean. They last longer but they aren't going to increase performance over another plug unless you are replacing worn out ones.

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    Re: Iridium Spark plugs

    A lot of people are saying on the Colorado forums that they notice their headlights are brighter after switching to the Iridiums, I am finding the same thing myself as crazy as it sounds. The Colorados have 5 coils, one over each plug and the Iridiums take less voltage to fire, therefore less of power drain, therefore brighter headlights.

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    Re: Iridium Spark plugs

    Quote Originally Posted by 1997BlackETC View Post
    A lot of people are saying on the Colorado forums that they notice their headlights are brighter after switching to the Iridiums, I am finding the same thing myself as crazy as it sounds. The Colorados have 5 coils, one over each plug and the Iridiums take less voltage to fire, therefore less of power drain, therefore brighter headlights.
    That's the most rediculous godamn thing I ever heard in my life. You'd have a better chance of making the Northern Lights look brighter by standing in the back yard waving bed sheets at them.

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    Re: Iridium Spark plugs


    Don't hold back Koz. Tell us how you really feel, but I have to agree with you.

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    Re: Iridium Spark plugs

    Quote Originally Posted by Ranger View Post

    Don't hold back Koz. Tell us how you really feel, but I have to agree with you.
    What's ironic is that if the theory were true the spark plugs would draw more current and the headlights would dim. Nixon was right; the public will believe any damn thing you tell them.

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    Re: Iridium Spark plugs

    I haven't put the iridiums in my Northstar but I have them in the GN. I'm not sure they'd be necessary in the Northstar, frankly. I only started having trouble with the Delco plugs in the GN when I started to tighten the gap well beyond stock so that I could run much higher timing and boost. The car wouldn't idle right but at WOT it was fine. The iridiums fixed that by exposing more of the fire to the intake charge with a tight gap. The car idles like stock, has really snappy throttle response and I can run it at the track without having to re-gap the plugs. I can't remember the last time I've had the plugs out of the car, actually. When I do pull the iridiums out, they look like the day I put them in. I guess that's the only reason - longevity - that I'd put them in the Northstar. But with the platinums going 100k miles, what more do you want? The iridiums are almost twice as much as the platinums, aren't they?

    Jim

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