Are the NGK CR8EIX any better?

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by Balsta, Mar 7, 2009.

  1. AdvGa

    AdvGa Long timer

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    OK....put the Iridiums in my KTM Adventure last night...my original post was from past experience with another bike...

    After doing the Valve Check and putting in the Iridiums-CR8EIX, here is what I now have personal experience with seat time-

    1-Crisper Accelleration
    2- Better Low End Torque

    3- Gas Mileage to be determined after a couple of Tanks...
    #21
  2. mousitsas

    mousitsas Long timer

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    Could all these be due to new plugs no matter what they are? Kind-of seat of pants difference after putting new oil.
    #22
  3. AdvGa

    AdvGa Long timer

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    ...no, since Iridiums in other bikes (Non-KTM) performed the same way.

    Also, normal plugs are good to about 8-15k miles where Iridiums are good to about 20-40k miles and the Harder Metal materials don't degrade as fast and as mentioned above, easier on the Ignition System.
    #23
  4. Schannulleke

    Schannulleke Been here awhile

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    That doesn't exclude the possibility that it could be due to the fact that it are new spark plugs.
    #24
  5. charlie264

    charlie264 Long timer

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    Not say they make that much difference, but iridium is one of those strange metals, very high melting point, very dense but brittle and almost a superconductor at low temperatures. Oh bloody expensive too.
    #25
  6. men8ifr

    men8ifr Been here awhile

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    FWIW I use iridium plugs in my bikes including the 2 stroke, also I gap them to around 1.1mm, bigger gaps mean more energy and a better, more consistent start to the burn, the very thin iriduim electrode means less voltage is required to fire the plug for a given gap, so since you have lets say 40kv available increasing the gap makes more use of that. The manufacturers make some use of this typically I notice the iriduim gaps are slightly (0.1 to 0.2mm) bigger than copper cored plugs.
    The iridium plugs definitely make a difference but show up most when the mixture is difficult to ignite i.e. cold, too much egr or too lean and the difference can be significant there.
    So they get my vote.
    #26
  7. V-rider

    V-rider Been here awhile

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    Check this out charlie264. May help clear up things:<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:eek:ffice:eek:ffice" /><o:p></o:p>
    <o:p></o:p>
    http://www.ngk-elearning.com/

    http://www.ngksparkplugs.com/tech_support/spark_plugs/index.asp?mode=nml
    <o:p></o:p>
    <o:p></o:p>
    A few more quick answers:<o:p></o:p>
    <o:p></o:p>
    "Engine knock is caused by either too high compression ratio for the fuel/air mixture, i.e. too low amounts of octane in the fuel, octane is added to petrol to increase its compressibility before itself ignites, we want spark plug to do that."<o:p></o:p>
    <o:p></o:p>
    Over-advanced ignition timing also causes knock. <o:p></o:p>
    <o:p></o:p>
    "I don’t agree, the main reason for plugs to have a heat range is to keep um clean. When a plug runs at the “correct temperature” is far less prone to fouling, go to hot it can result in pre-ignition but if your plugs are fouling up, going up one on the heat range is advisable, misfiring is not good for engines."<o:p></o:p>
    <o:p></o:p>
    Not sure what you "don't agree" on. The optimum center electrode temperature range is from 450 to 800 degrees C. Colder than 450 causes fouling - hotter than 800 risks pre-ignition. Most motorcycle manufacturers allow for one heat range colder or hotter to address cold fouling or high speed operation. Going outside that "recommended" range will cause problems under certain operating conditions.
    <o:p></o:p>
    "Err kind of agree, as I was told, there are two parts to the electrode, one which is made from steel. Steel conducts electricity and is magnetic but is it gets too red hot it becomes austenitic, doesn’t like to conduct electricity and becomes nonmagnetic so becomes more an insulator. This is safety for your engine because it will promote a miss and cool the motor down."<o:p></o:p>
    <o:p></o:p>
    Nothing is designed into the spark plug to "promote a miss". Misfiring is not good - like you said. Has absolutely nothing to do with magnetism or becoming "austenitic" or anything like that. The center and side electrodes are a nickel alloy and usually have a copper core. The copper is for increased heat transfer for better durability. No iron or steel electrodes.
    <o:p></o:p>
    #27
  8. charlie264

    charlie264 Long timer

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    What I heard from an auto mechanical engineer, the body of the plug is steel including the ground leg, as steel reaches red hot it becomes more an insulator rather than a conductor.

    At atmospheric pressure the spark would just jump to any ground if the leg was missing as the coil discharged. But air is a very good insulator being 78% inert nitrogen, when compressed at 8 to 10 times atmospheric pressure in a combustion chamber it’s even harder for the spark to jump and it won’t make the distance to the plug barrel, hence the leg.
    #28
  9. V-rider

    V-rider Been here awhile

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    Nope. The side electrode is a different material - nickel alloy - that is welded onto the shell.

    We have done many tests with the side electrode cut totally off - spark jumps fine to the plug shell. Have you ever head of semi-surface discharge plugs? Racing plugs? The spark is jumping to the shell.

    Also, think about when your plug gets fouled - where does the spark go? It runs down the side of the carbon covered insulator right to the shell. Plenty of voltage to do so.

    Check out the links I posted before. It might clear some stuff up for you. Have a good one.
    #29
  10. charlie264

    charlie264 Long timer

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    Did I say he was old school, once upon a time...Get with the times man, just ordered a set of IX iridium’s.
    #30
  11. V-rider

    V-rider Been here awhile

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    Huh???
    #31
  12. charlie264

    charlie264 Long timer

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    I'm sure in his day plugs were made from steel and copper and not exotic alloys, so what he said does have some bearing.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:eek:ffice:eek:ffice" /><o:p></o:p>
    <o:p> </o:p>
    #32
  13. AdvGa

    AdvGa Long timer

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    1-Crisper Accelleration
    2- Better Low End Torque

    3- Gas Mileage to be determined after a couple of Tanks...

    So far there has not been improved Gas Mileage with urban riding...

    we'll see if there is a difference with long trips later.
    #33
  14. sstewart

    sstewart Long timer

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    Damn,I think I'll try some Champions after all that. Not!!!
    #34
  15. Balsta

    Balsta Been here awhile

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    Put Iridium plugs also in my tired (89 hp) automobile. YES! Clearly smoother idling!
    #35