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Thread: We have the wrong plugs !

  
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    We have the wrong plugs !

    While in Halfrauds the other day I had a look at the spark plug chart.

    It lists the BKR6EK for 1.8 and the BKR5EK for the Turbo.

    Had a look on sparkplugs.co.uk, and it confirms that the BKR5EK is the std plug for the Turbo and the BKR5EIX the Iridium one.

    As I currently have the BKR6EIX in at the moment I may put these in the wifes car and get the correct ones for mine.

    I always though the higher the number the colder the plug ....?

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    IX BKR6EIX-11 are the ones you want for the turbo m8....

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    You need a smaller gap not a bigger one for a modified engine, so BKR6EIX-11 is no good.

    BKR6EIX is same heat rating as the BKR6EK which is only for normally aspirated engines.

    NGK recommends either the BKR5EK or BKR5EIX for the Z20LET Engine.

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    Quote Originally Posted by mantamagic
    You need a smaller gap not a bigger one for a modified engine, so BKR6EIX-11 is no good.

    BKR6EIX is same heat rating as the BKR6EK which is only for normally aspirated engines.

    NGK recommends either the BKR5EK or BKR5EIX for the Z20LET Engine.
    This subject has been well covered on ZLET with replies from NGK themselves - the whole point of Iridium plugs is the fact that they can generate a spark over a bigger gap than a standard plug. There are many proven RR results to show the iridium plugs give a good gain on the ZLET engine - and run a lot cooler too.

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    Quote Originally Posted by mantamagic

    I always though the higher the number the colder the plug ....?
    Correct!

    They are actually recomending a hotter running plug for the Turbo

    BUT then in their tech section they say if modfiying then you'll probably need a colder plug!

    I'll stick with my BKR6EIX which I've been running for 14months now with no problems.

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    After looking at the full Zlet thread and checking on the NGK temperature chart, it does indicate the the BKR5EK and BKR5EIX are a warmer running plug than the BKR6EK/BKR6EIX which would be a wrong application.

    It would seem that the sparkplugs.co.uk and Halfords application charts are indeed wrong.

    On looking at a recent posting on scoobynet, they seem to recommend a plug temperature rating of 7 (our equiv being BKR7EIX) with a plug gap for a modified car being around 0.7. This would indicate the that a 1.1 mm gap is indeed too large.

    When I replace my current plugs I will give the BKR7EIX a try, but for now will stick with the BKR6EIX as they have been running ok for the past 8 months.

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    When I spoke to Sparkplugs.co.uk they asked NGK and they said one grade cooler should be OK. You have to be careful with too cool running plugs as they can foul. What is the standard recommended plugs for the Subaru?

    Regarding the gap, the only issue to arise from too big a gap on a modified engine is the spark blowing out. Then you close the gap. It is easier to close a gap on an Iridium plug, so I would say 1.1mm on anything up to around PH3, then 0.8mm gap for higher spec cars.

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    I'm running the BKR6EIX on the basis that I do high miles and will have the engine at about 230 to 240bhp soon. They seem to work well.
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