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Thread: Ultimate Opel Spark Plug

  1. #61
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    Quote Originally Posted by First opel 1981 View Post
    Yes, with NGK, the number is in reference to heat range.
    Lower is colder, I believe. (Per the NGK website:
    The image below is a representation of the difference between a hot and cold heat range. NGK spark plugs’ heat range goes from 2 (hottest) to 11 (coldest).)

    If you are fouling then you need a hotter plug. If you are dieseling then a colder one.

    With the 2.4, you need to watch the Temps. Colder plugs will be better than hotter ones.
    https://www.ngksparkplugs.com/about-ngk/spark-plug-101/understanding-heat-range

    HTH

    PS - 0.7 mm is approximately .028 inches

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    Okay, if that's true, then I'm running the next cooler than stock recommended temperature plug, which that, and maybe another step cooler, is what MSD recommends. So, it appears I'm on the right track as far as plug choice.


    As far as driving and checking the spark plug color, as I've stated previously(and possibly heard from RallyBob, I think), multi-spark systems like an MSD tend to be "self cleaning". The spark plugs always look the same perfect light brown color. Even the Red Baron's 90-100-50-90(something like that), beat-but-ferocious(crazy cam....yee-ha!), engine couldn't discolor the plugs.


    Is Norbert's plug list the same as what is recommended for factory 2.0's?


    Do each spec the same type of plugs?(2.0-2.2-2.4 the same?)


    Soooooo, since I seem to be, based on 69whiteGT's research(?)(not to discount FO81's "I believe" ), in a safe range with my plug choice, shall we say that it's the concensus that I gotta drop that plug gap down to somewhere between .025-.030 ??? And that .045 is way out of the ballpark?



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    Can I also presume that too large a gap can overheat the plug, possibly causing preignition, and cause missing if the spark can't jump the gap?


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    Quote Originally Posted by GeorgeOpel View Post
    Whats the best plug to use in a 73 Lotus Europa 1.6L twin cam engine. Ford cosworth block/ lotus head?
    That engine works best if you stick the pointy part of your head into the hole!

    JMHO -- Doug
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    Quote Originally Posted by The Scifi Guy View Post

    As far as driving and checking the spark plug color, as I've stated previously(and possibly heard from RallyBob, I think), multi-spark systems like an MSD tend to be "self cleaning". The spark plugs always look the same perfect light brown color.
    Well I think that your confusing true multi-spark with the MSD capacitance discharge.

    True multi will fire the spark KV aka firing voltage several times at low rpms.
    The MSD unit is like a buzz saw... firing only during the burn time.

    Si vis pacem, para bellum "If you want peace, prepare for war"

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    Quote Originally Posted by The Scifi Guy View Post
    Can I also presume that too large a gap can overheat the plug, possibly causing preignition, and cause missing if the spark can't jump the gap?

    .45 does seem a little high, I would gap it no more then .40, probably more around .35 is where you need to be. Go put some miles on that long strokin' 2.4 beast!
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    Quote Originally Posted by The Scifi Guy View Post
    Can I also presume that too large a gap can overheat the plug, possibly causing preignition, and cause missing if the spark can't jump the gap?

    It's been a really long time, but MSD used to also recommend more gap for their super hot spark? I would find it hard to believe that the new gap would be 60% greater however! The .035" gap would be 25% higher than the .028 recommended by Opel.

    Doug

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    Quote Originally Posted by The Scifi Guy View Post
    Can I also presume that too large a gap can overheat the plug, possibly causing preignition, and cause missing if the spark can't jump the gap?

    STOP THINKING

    With to large of-a-gap the combustion chamber temps will run cooler as also the sparkler.
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    Setting back in my arm chair.
    There are three areas to think about.
    1: Firing line voltage
    This is the amount of voltage to cross the gap.
    Measured as thousands of volts aka KV

    Second is burn time.
    This is measured in ms.
    A kool clip is around two ms

    The third is burn duration.
    Both burn and the above should be square.
    If confused ..jump back and reread this thread.
    Last edited by hrcollinsjr; 05-07-2016 at 07:41 AM.

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    Quote Originally Posted by wrench459 View Post
    STOP THINKING
    Quote Originally Posted by wrench459 View Post
    There are three areas to think about.


    Well, gosh dang it, which one should I do!




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    Btw.With a colder spark plug and greater gap the self cleaning affect will be died

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    I reduced the plug gap to around .030". The car started easier and the miss while warming up went away. The plugs were black, which the previous plugs the car had in it for 150 miles and which were in the Baron for 1500+(gapped to .030-.035), never were. They were previously always light brown when used in both cars' engines. So I guess that Norb' was right and the self-cleaning effect did not happen when the gap was too large. I'll put another 100 or so miles on them and see how they look.


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    Fired my GT up the other day.
    It's been setting in storage due to some health problems,

    The sucker ran like %$@^&$.
    Removed all the sparklers found one that looked a bit odd.



    Waveform to follow...I forgot the CF card tonight

    Last edited by wrench459; 11-04-2016 at 09:59 AM. Reason: added picture
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    I'm currently using the NGK BPR7HS spark plugs that I used to use in my 2.0.......in my 2.4.

    In discussion with Charlie about fuel economy and such, he suggested using a "cooler" temperature plug, like a 6HS.

    What the heck does all this hotter/cooler stuff mean in regards to spark plugs and how can hotter/cooler affect gas mileage? Someone please give a long dissertation on the subject.

    Next question: What is the factory recommended spark plug for a Frontera/Omega 2.4 engine?

    Since I'm running a side draft carb, should I adjust the temperature rating of the spark plug to take that into account?


    No charts Dan! Please confine yourself to endearing, folksy, country-speak! "Well, Gordy, it's just like when a 'coon gits inta the hen house. When the hens're cold the eggs is old and when the rooster's a crowin' the hay needs a mowin'."

    Wh.....wh.....whaaat?

    Last edited by The Scifi Guy; 1 Week Ago at 08:52 PM.

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    Quote Originally Posted by The Scifi Guy View Post
    I'm currently using the NGK BPR7HS spark plugs that I used to use in my 2.0.......in my 2.4.

    In discussion with Charlie about fuel economy and such, he suggested using a "cooler" temperature plug, like a 6HS.

    What the heck does all this hotter/cooler stuff mean in regards to spark plugs and how can hotter/cooler affect gas mileage? Someone please give a long dissertation on the subject.


    Next question: What is the factory recommended spark plug for a Frontera/Omega 2.4 engine?

    Since I'm running a side draft carb, should I adjust the temperature rating of the spark plug to take that into account?


    No charts Dan! Please confine yourself to endearing, folksy, country-speak! "Well, Gordy, it's just like when a 'coon gits inta the hen house. When the hens're cold the eggs is hot and when the rooster's a crowin' the hay needs a mowin'."

    Wh.....wh.....whaaat?

    Gordo, If you want a "colder" plug you would go to a BPR8HS. The 6HS would be a "hotter" plug then what your running. What do you plugs look like in your engine? If they are "tan" I would leave them alone... Post some pictures of the #2 spark plug, it typically runs the hottest. It's usually a good indicator of how clean your engine is running.
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    Gordo the cow say's eat mor chikin.

    The ground strap electrode should turn color 2/3ths of the way(proper heat range) for a street sweeper.
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    Quote Originally Posted by 69whitegt View Post
    Gordo, If you want a "colder" plug you would go to a BPR8HS. The 6HS would be a "hotter" plug then what your running. What do you plugs look like in your engine? If they are "tan" I would leave them alone... Post some pictures of the #2 spark plug, it typically runs the hottest. It's usually a good indicator of how clean your engine is running.


    ^^^^^This^^^^!!

    Gordo, NGK plugs are rated 'backwards' compared to say, a Bosch plug. Lower numbers are hotter, higher numbers are cooler.
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    My understanding is hotter plugs are designed to run hotter, and cooler plugs cooler, and in both cases it's more about their ability to tolerate heat, to conduct it away from the electrode. I don't think it has anything to do with the spark itself.

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    Quote Originally Posted by baz View Post
    how about making a collar 1/4" long that threads on to plug, could be tapered to match plug if needed or add compression washer, add a little exhaust compound and have the plug tip in the right spot with no threads showing ?
    I'm gonna bump the above idea. No one talked about it.

    As for the temperature range of a spark plug, it has to do with the ceramic insulator. The hotter a plug, the less ceramic insulator there is to serve as a heat barrier, exposing the electrode to heat quicker. It has nothing to do with the ability of the spark plug's spark itself, and more to do with melting the plugs / pre-ignition or fouling. Engines that are used in high performance applications run colder plugs because racers don't want to destroy their engine when the plugs get so hot, that they pre-ignite the fuel. If two plugs of identical design except their temperature rating are used, the spark will be the same. The temperature of the plug would only impact fuel economy if the temperature of the plug wasn't correct for the application, causing the plug to foul from carbon build up (bad spark, misfire) or overheat (pre-ignite). I believe I communicated all this correctly, it's been a long day.
    Last edited by Autoholic; 1 Week Ago at 02:10 AM.
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    Something to think about. I'm sure one day in the not too distant future, there will be laser plugs for classic cars.

    https://www.newscientist.com/article...e-efficiently/
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