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Spark Plugs

This is a discussion on Spark Plugs within the Kia Forte Turbo Maintenance forums, part of the Kia Forte Turbo Garage category; Originally Posted by schizorazgriz I read something on the NGK website "A good rule of thumb is, one Heat Range colder for every 75–100hp added." ...

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Thread: Spark Plugs

  1. #21
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    Quote Originally Posted by schizorazgriz View Post
    I read something on the NGK website

    "A good rule of thumb is, one Heat Range colder for every 75–100hp added."

    Soooooo unless I get a tune and full bolt on I can run stock plugs right? Won't colder plugs build up junk on them? Please enlighten.
    Once you get a stage 1 tune you want to go to colder plugs due to the stock ones being to hot for the combustion process. From what I understand because when tuned the chamber gets way hotter and can cause LSPI or misfires with the stock plugs. I ran stock plugs for a week till I got the ngk 1422s and the car ran totally better. I wouldn't push the car at all with the stock plugs being afraid of what could happen.

    I am by no means a spark plug guy or have a lot of knowledge on plugs except for what I read and talk to people about so I may be a tad off lol
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    Quote Originally Posted by Trocko View Post
    Okay... So for the un-initiated such as myself to turbos, what does "going a step colder" mean?

    Why can't you run XP5701's on a stock motor?

    Does running "colder plugs" improve performance?

    And finally... I am making a list of "essential mods" that I want to do lol, so from what I have read in this thread, the stock plugs are junk, yes?

    Thanks so much
    Colder plugs will make the car in stock form run like crap. The plug won't be hot enough to ignite the air/fuel in the chamber. At the max I would go to the XP5702 in a stock motor until you are tuned. I have even read and seen a video on the VT forums where a guy is running colder plugs and his car won't pull or go past 4k rpm because of the plugs.

    A step colder is like going from a 100* day down to like a 90* day. So basically the spark plug isn't giving off as much "heat" when you go one step down

    Hope I explained this decent lol
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    So from what I read it's a common misconception that spark plugs give off heat in a way that heats the cylinder. When you go a step colder in plug you are actually going to a plug that CAN give off more heat simply because it is disipating it faster. This plug runs at higher cylinder temps because it IS able to get rid of more heat and therefore the core of the plug stays colder and hence a colder spark plug.
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  5. #24
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    Spark plug temps are new to me. If someone can, ELI5 how a spark plug temperature affects combustion.
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    Quote Originally Posted by SXT View Post
    Spark plug temps are new to me. If someone can, ELI5 how a spark plug temperature affects combustion.
    Here is a little reading on what the hot and cold means and what it does,

    Heat Range Explanation
    Typically the heat range for NGK Spark Plugs varies from 2-11. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or whether it provides resistance to heating up (cold).

    Generally, low power engines such as lawn mowers don’t produce a large amount of heat, hence use a low heat range (or hot) spark plug such as a 4 heat range. This means the spark plug will heat up easily and reach its optimal operating temperature. High performance engines on the other hand produce a large amount of heat, hence a high heat range (or cold) spark plug such as a 10 heat range needs to be used to resist the heat developed by the engine.

    Several factors influence the heat range of a spark plug, although typically the insulator nose design provides an indication of the heat range of a spark plug.

    When a spark plug absorbs heat produced from combustion, the heat is transferred through the center electrode and insulator nose to the metal shell, which then transfers the heat into the engine casing and circulating coolant.

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    A low heat range (or hot) spark plug typically has a long thin insulator nose which will heat up easily however will not dissipate readily to the metal shell (above left). Conversely, a high heat range (or cold) spark plug has a short thick insulator nose which will dissipate heat much easier (above right).

    When the heat rating is too high:

    The spark plug temperature remains too low and causes deposits to build up on the firing end; the deposits offer an electrical leakage path that gives rise to loss of sparks.

    When the heat rating is too low:

    The spark plug temperature rises too high and induces abnormal combustion (pre-ignition): this leads to melting of the spark plug electrodes as well as piston seizure and erosion.

    NGK Spark Plugs pioneered the use of a copper cored electrode in 1958, which enables a spark plug to heat up quickly and also dissipate heat quickly giving an ultra wide heat range. It is essential to use a spark plug that fits a specific engine and its conditions of use.

    As spark plugs are positioned in the head of an engine, their analysis can give a good indication of how your engine is operating.

    Directly from the Technical Information page at NGK
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    Sooo, with a CAI, IC resonator delete, and muffler delete to 2.5" straight pipes, XP5702, or 5703?
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    Quote Originally Posted by CrypTech View Post
    Sooo, with a CAI, IC resonator delete, and muffler delete to 2.5" straight pipes, XP5702, or 5703?
    xp5703 for now, if you go further like FMIC and DP then drop to the 5702.
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    Quote Originally Posted by CrypTech View Post
    Sooo, with a CAI, IC resonator delete, and muffler delete to 2.5" straight pipes, XP5702, or 5703?
    For stock you can run either one really. Depends on your climate there also. Stock replacement would be the XP5703. If you want to try a step down it would be the XP5702 and it may run better with those. If your auto parts store is cool with returns you can try the XP5702 and see how it runs. Mine told me if I don't like these that I could return them and search for something else.

    EDIT: Dang it jason! beat me to it! lol

    I am going to update the first page with which plugs you can use with what shortly. I think the XP5702 would be good for mild to full bolt ons before tune
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    Alright updated the first page with what plugs you can use with what mods. If there is any information that you guys want added let me know and I will add it.

    Took the explanation of the heat range that you posted playwithmymind and put it on the front page also
    Last edited by Forte5; 09-10-2015 at 09:12 AM.
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    So in recent years, temps were in winter, like -20F. I should probably go with the XP5703 then, right?
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