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Which Spark Plugs..?

Discussion in 'Z3 Roadster & Coupé' started by upstream, Sep 27, 2014.

  1. upstream

    upstream Regular Member
    The M44 Massive

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    Hi all,

    Just doing a bit of tinkering and decided to check my spark plugs. They look ok (a sort of light tan colour) but I have no idea how long they've been in there and thought it may be a good idea to change them.

    The ones currently in there are NGK R R1 BKR6EK

    I checked Halfords but my local store doesn't have them in stock at the moment. Are these the ones that BMW recommend? Are there any others just as good?

    I'm happy to go with what the wisdom on here suggests.

    Thanks in advance.
     
  2. David Cullen

    David Cullen Zorg Legend
    Supporter The M44 Massive

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    light tan is good, you could check the gap on them if they are in general good condition, they might be long life plugs, that's what I put in mine the last service but I forgot to ask how long long life is lol and don't have the code bar I take one out ;-/ im sure someone will be on to give you a heads up ;-)
     
  3. David Cullen

    David Cullen Zorg Legend
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  4. David Cullen

    David Cullen Zorg Legend
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    BKR6EQUP for NGK

    FGR7DQP for Bosch
     
  5. upstream

    upstream Regular Member
    The M44 Massive

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    Turns out that my second closest Halfords had a set so I grabbed them and popped them in. I did notice though that whilst the packaging said for BMW M43, they didn't say M44.

    On a quick round the block test nothing went "bang" so all's well ;-)
     
  6. jonco

    jonco Zorg Guru (III)
    Supporter British Zeds The M44 Massive

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    A bit late but there was a thread not long ago on same topic https://zroadster.org/threads/spark-plugs.5351/#post-64431 may be of interest.
     
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  7. vintage42

    vintage42 Dedicated Member
    American Zeds

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    The NGK BKR6EK is for the 1.9. The NGK BKR6EKUB and BKR6EQUP are for the 2.8.
     
    #7 vintage42, Sep 28, 2014
    Last edited: Sep 28, 2014
  8. zedonist

    zedonist Guest

    Wrong both the BKR6EK and the BKR6EQUP are specified for the M44, as they are for all other engines in the range except the //M, how ever the upgrade plug BKR6EIX is the preferred plug from NGK and works very well in the M44.
     
  9. vintage42

    vintage42 Dedicated Member
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    In the attached correspondence with NGK, they say only the BKR6EK is recommended for the M44, and the BKR6EIX is not recommended.
     

    Attached Files:

  10. vintage42

    vintage42 Dedicated Member
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    Do you have a reference for the statement about the BKR6EQUP?

    I am aware that the BKR6EIX is used by some people in the M44. But after NGK noted their incompatibility with the M44's ignition system, I put in the BKR6EK.
     
  11. zedonist

    zedonist Guest

    I have the BKR6EIX Fitted in my M44 no problems, been in last 3 years, new set going in over the winter service because there cheap to do, not because they are worn out.

    I would suggest your contact is not aware of his company website and technical information:

    IMG_0271.PNG
     
  12. zedonist

    zedonist Guest

    It is strange, that NGK in the USA does not recommend the EIX for the Z3, but the UK does, I have now compared both websites, it would be interesting to know your contacts take on this?
     
  13. vintage42

    vintage42 Dedicated Member
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    He is not my contact, just an NGK technician who answered my questions two years ago.
    In the email posted above, he said:
    "The BKR6EK has a 6.0mm firing position with two ground electrodes and a 1K ohm internal resistor. The BKR6EIX has a 3.5mm firing position, with a single ground electrode and a 5K ohm resistor. The firing position might create some engine response lag, but the real concern in the 1K ohm resistor. The ignition in the Z3 is setup for a 1K Ohm resistor and the 5K resistor may cause random misfires... I would realistically not recommend the BKR6EIX for the Z3."
    I think he is saying that 5K ohm resistance of the EIX is more than the Z3 coil pack was designed put a spark through, and can cause misfires. Perhaps that problem is only theoretical, as the Z3 seems to overcome it. But the two plugs have very different firing positions and resistances, so you would not assume they can be interchanged.
     
  14. badman gee

    badman gee Guest

    Where were you today at Santa pod?
     
  15. zedonist

    zedonist Guest

    Well the UK obviously disagrees, or the EIX has been modified. I don't know how a spark plug can cause a random misfire, unless it stops working, it's the ECU and Cam Sensor that decides it's time to fire and the coil pack sends the charge down the cable and the plug fires. I have never had any random misfires reported in the three years they have been fitted.

    My understanding is that resistors in spark plugs are there to remove electromagnetic noise, and should be used in cars with electronic engine monitoring and not using them can cause poor idle and misfires.

    Sort of makes a case for the EIX to be used, as I don't have rough idle either.
     
  16. zedonist

    zedonist Guest

    Putting the Z on axle stands, did you have a good time?
     
  17. vintage42

    vintage42 Dedicated Member
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    The EIX would cause a misfire if the Z3 coil, which is designed to see a 1K ohm resistance, could not push a spark through the EIX's 5K ohm resistance. Maybe it's hard on the coil to push its charge through 5K ohms.
    Worse, the charge has to go or dissipate somewhere. If it does not find an air gap elsewhere it can jump, it stays in the coil. Perhaps after thousands of miles, the accumulated effect of occasional random, intermittent, unfelt and un-sensed misfires causes a problem with the coil pack.
     
  18. badman gee

    badman gee Guest

    Wonderful time!
     
  19. zedonist

    zedonist Guest

    But they don't, your talking theory of a concept, that I have proved is not there or happening, and what's more NGK specify them as an upgrade plug from the original. It all ends up being a mute talking point.

    From what I garner all NGK resistor plugs in the UK are 5ohm, perhaps the issue is only in the USA?

    For the other M44 owners reading all we can say is there is a choice of three plugs available in the UK, and the part numbers are above, use the one that you feel comfortable with.
     
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  20. zedonist

    zedonist Guest

    Good good.
     

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