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Thread: INFO: Spark Plug Gap and TSB

  1. #1
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    INFO: Spark Plug Gap and TSB

    Well as some of you may know my uncle is a mechanic and often takes courses to update his training, well today he was telling me that NGK had issued a TSB and gave me the TSB I will have them scanned in tommorrow and you guys can see but apparently since all the new fuels contain ethanol and since our engines aren't designed for ethanol we lose mpg and it's bad for emissions. The TSB says to lessen the gap by .010 therefore since ours is 0.42 it would become 0.32, although it says never to lessen it less than 0.35 therefore our gap would need to be changed to 0.035.

    Therefore change your gaps to 0.035, it also talks about people not adjusting the plugs after adding CAI or short rams with the increased air flow it leads to leaner conditions blah blah blah, I will scan them in. It's said to improve mpg and power and also for every 50hp increase you have to increase the type of spark plugs to two ranges cooler or something anyhow once I scan the sheets in you guys can tell for yourselves.

    EDIT: Will be posted tommorrow June 11, 2007 at around 2pm-5pm
    EDIT2: As promised Pictures are posted below

















    Last edited by dalinxz; 06-11-2007 at 01:59 PM.



  2. #2

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    Re: INFO: Spark Plug Gap and TSB

    Sounds like some good info. Don't forget ot post it.

  3. #3
    3Geez Veteran MessyHonda's Avatar
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    Re: INFO: Spark Plug Gap and TSB

    i just have my NGK gaped at .50....il try to change the gap next time at tune up. i have a CAI, cam gear,and full exhaust...headers coming soon

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    Re: INFO: Spark Plug Gap and TSB

    This goes for any car now days? to clarify this will increase our mpg? my spark plugs are gapped at 1.1 mil. and .050 inches. I'll shorten it when i change my plugs. Thanks for the info.

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    Re: INFO: Spark Plug Gap and TSB

    ok sorry haven't had time to scan in the TSB yet will do it tommorrow I promise I just realized its a sticky so its important, but dont do anything yet and 0.050 is quite high, way too high its supposed to be 0.042, I found my mileage has improved, power remained similar I mean maybe a little more torque but not much but I think that's because I still haven't changed to a cooler range. But I'll scan the TSB tommorrow and you guys can all check it out. But basically you need to regap it to 10 thousand less so 0.042 to 0.032 but 0.035 is the lowest you should go and your supposed to increase the heat range to 2 ranges cooler for every additional 50hp so lets say the model is NGK BRP5EGP then 2 ranges would be BRP7EGP but I'll scan them tommorrow I Promise lol.

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    Re: INFO: Spark Plug Gap and TSB

    It's meant for all cars, my uncle was telling me even new cars are supposed to be regapped because the dealers aren't changing it either since they aren't all aware of the TSB and when they test they aren't using gases with ethanol, but with those cars the ECU can adjust it to a certain extent but ya it's for all cars not Hondas only.

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    Re: INFO: Spark Plug Gap and TSB

    Quote Originally Posted by MessyHonda
    i just have my NGK gaped at .50....il try to change the gap next time at tune up. i have a CAI, cam gear,and full exhaust...headers coming soon
    CAI is extra airflow requiring gap to be changed
    as does the fuel with ethanol
    Basically for every 50hp you have added you need the gap changed and 2 ranges cooler. Ill scan these in the morning once I wake up.

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    Re: INFO: Spark Plug Gap and TSB

    as promised pictures are posted!!!

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    Banned ahmad89's Avatar
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    Re: INFO: Spark Plug Gap and TSB

    i need to re-gap mine to .040 but its way too hot to even sit outside.

  10. #10
    SEi User Strugglebucket's Avatar
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    Re: INFO: Spark Plug Gap and TSB

    since this is stickied, i would also add that if you disable your egr you need to run a step colder.
    Originally Posted by Justanothermike
    my A20 is not SLOW. ur A20 is slow.

  11. #11
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    Question of concern

    Has anyone had any real world results from changing you're plug gap and a step cooler.
    Last edited by steveko; 01-04-2008 at 07:58 PM.

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    3Geez Veteran Pico's Avatar
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    Re: Question of concern

    Quote Originally Posted by steveko View Post
    Has anyone had any real world results after this post curious.

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    Re: Question of concern

    Spark plug gap doesn't make a plug run colder anyway it's set. Certain plugs are make to run at a higher resistance, aka "hotter".
    .

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    Re: Question of concern

    I thought the plug heat range was how much it is exposed to heat and how good it is at transferring that heat away.

    - llia


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    Re: Question of concern

    I did'nt say that reducing the gap makes it run cooler.I'm talking about getting new plugs 1heat range cooler and closing the gap as suggested. I'm referring too the post IMPORTANT at the top of the technical page.
    Last edited by steveko; 01-05-2008 at 08:05 AM.

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    Re: Question of concern

    What knowbody has any answers or results from this post.
    Last edited by steveko; 01-05-2008 at 10:48 PM.

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    Re: INFO: Spark Plug Gap and TSB

    From what I took out of the article .035 is the lowest you want to go gap wise.I don't know about going 1 heat range cooler in you're application but possibly mine.Also if memory does'nt fail me I think you're leaning the car out with any modification air filter,exhaust,etc.you would have too adjust the fuel to air ratio.
    Last edited by steveko; 01-09-2008 at 07:13 PM.

  18. #18
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    Re: INFO: Spark Plug Gap and TSB

    "0.050 is quite high, way too high its supposed to be 0.042, "

    Pretty sure it says 1.0 +.01 on the hood of my car; ie .050
    ---------------------

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    Re: INFO: Spark Plug Gap and TSB

    if it aint broke then dont tryda fixit!!!
    Last edited by rfiks; 11-09-2008 at 09:32 AM.

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    Re: INFO: Spark Plug Gap and TSB

    So is there any official word on this? Or does it depend on need/preference/situation? I replaced plugs and wires yesterday and gapped them at .04. I remembered this link saying .035 was where it should be at, given all the circumstances. However the guy at Autozone told me to gap them at .044. Figured I'd split the difference and thats what they're at right now.

    Good, bad, any suggestions?

    Any help would be great, thanks.

  21. #21
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    Re: INFO: Spark Plug Gap and TSB

    Really this is/was unproven. I don't want to comment any farther on it since it is a sticky so someone important felt it needed to be at the top the first day it was posted. Sounds to me like NGK had some problems and an engineer got in a panic and cover his ass with that little TSB.

    I run up to 30% ethanol at any one time in the last 2 years and have not found any problems with my spark plugs. I recorded a 30.6 mpg last week after running 3 tanks of just 87 octane fuel (10% ethanol) at 29 mpg.

    1.0mm=.039 inches just to correct another factual mistake posted.

    wp
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  22. #22

    Re: INFO: Spark Plug Gap and TSB





    STOCK
    BPR5EY11 = 6937

    1 STEP COLD
    BPR6EY11 = 6261

    This is weird because I was running the colder 6261 plugs and I melted a valve, when I showed one of the mechanics who frequents the shop he asked me if I was running the correct-heat plugs. I also run 87 octane, no egr, and abuse the car daily.
    Last edited by POS carb; 07-11-2012 at 02:46 PM.
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  23. #23
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    Re: INFO: Spark Plug Gap and TSB

    Quote Originally Posted by Oldblueaccord View Post
    Really this is/was unproven. I don't want to comment any farther on it since it is a sticky so someone important felt it needed to be at the top the first day it was posted. Sounds to me like NGK had some problems and an engineer got in a panic and cover his ass with that little TSB.

    I run up to 30% ethanol at any one time in the last 2 years and have not found any problems with my spark plugs. I recorded a 30.6 mpg last week after running 3 tanks of just 87 octane fuel (10% ethanol) at 29 mpg.

    1.0mm=.039 inches just to correct another factual mistake posted.

    wp
    im still running them still mixing e 85 and gas. Time to bury this one.


    wp
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  24. #24
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    Re: INFO: Spark Plug Gap and TSB

    Don't do it! I just tried this for myself. The plugs were gapped at 1.1mm or .044" and ran really smooth. Changed the gap to .035", I won't say the idle was rough, just kind of lumpy. Also, when I would push the gas pedal, the engine would lurch so much even my steering wheel would jolt. Needless to say, I never even made it out of the garage like this. Changed the gap back to .044" and all was right in the world again. There may be something to be said for the heat range thing though. I have a CAI and cat back, and the plug insulators are white, not tan (although they don't have many miles on them). I may go with BPR7ES instead of BPR6ES next time I change them.

  25. #25
    LX User niles's Avatar
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    Re: INFO: Spark Plug Gap and TSB

    FYI for those who want to try one heat range colder spark plugs, here are some part numbers:

    7082 (BPR5EGP) heat range 5 - NGK Platinum standard plug
    7084 (BPR6EGP) heat range 6 - NGK Platinum one heat range cooler

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