Colder spark plugs

Discussion in 'Fiesta ST Maintenance' started by RDgolfer, Nov 15, 2014.

  1. RDgolfer

    RDgolfer Active Member

    After having some knocking in my engine, I revisited Pelotonracer2's thread on going one step colder with new spark plugs. In his thread he also talks about modifying the ground electrode so their is better combustion. Anywho, today I purchased 8 NGK LTR7IX-11 so I can find the plugs that index at 4 or 11 o'clock. There have been some people who think this is nonsense, but I can only find out by doing it because "SCIENCE!" We shall see...anyone who has done this, feel free to post results, even if you can't prove it. If anyone is interested in this information, google "Pelotonracer2 one step colder spark plugs" and it should lead you in the right direction. Cheers!
     
    Last edited: Nov 15, 2014
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  3. RDgolfer

    RDgolfer Active Member

    Nobody has responded to this post..I am bamboozled...this is serious shit..well, whatever,,,go about your business
     
  4. Applejack

    Applejack Active Member

    I have fairies sprinkle pixie dust around my intake to get more power. Now, that sh_t REALLY works!
     
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  5. Dyn085

    Dyn085 Active Member

    The only thing serious about your post is that you're getting knocking in your engine. Considering the fact that I'm at Stage 3 (FreekTuned) without knocking, on OEM plugs (indexed wherever they felt like landing) and with the Cobb RMM, I would verify that everything is mechanically installed correctly and then talk with your tuner before installing random parts. Find what's wrong first and then fix what's found.

    Indexing your plugs does work, but not to the power-level to really make it much worth my time. It is a free couple of hp for those that want to buy a lot of plugs and figure out which index properly.
     
  6. reddog99

    reddog99 Active Member

    Unless the plugs you run are so far out of the proper heat range that the ceramic is glowing, then colder plugs won't do anything to help knocking. The only result you're likely to have is fouled plugs.
     
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  7. RDgolfer

    RDgolfer Active Member

    I talked with Randy...somehow I lost the 91oct tune...he emailed it to me, again, and I will install it tomorrow..btw, I have been using Cobb's ots 91oct tune, and I had zero knocks...winter gasoline I suppose...lower octane=more explosive...thanks for the well informed responses...you guys' are pretty smart
     
    Last edited: Nov 17, 2014
  8. RDgolfer

    RDgolfer Active Member

    Dyno, I'm sure you have read Peloton's thread...not only did he index the plugs to be at either 4 o'clock or 11 o'clock, the ground electrode was modified so it was ground back behind the the center line of the electrode by 1-2mm to produce an outward kernel blast to promote a more complete combustion...so a colder plug, which consumes heat and reduces hot spots, along with a more complete "burn" would no doubt keep knocking from occuring..which IS bad shit
     
  9. Dyn085

    Dyn085 Active Member

    Unless you're actually pumping in a lower octane fuel than 91, you're getting the same octane rating with winter blends as you do with summer. The difference between summer and winter blends lies in the amount of butane they're able to use as the Reid Vapor Pressure that's required to be meet is different due to the temperatures.

    Also, lower octane isn't 'more explosive', it's 'less resistant to combustion through compression'.

    I actually didn't read it, but plug indexing has been around for more years than I have. I really have no need to do modifications like that because my tune is dialed-in to not knock and the additional cost of trying to get enough plugs to index 4 properly negates my desire to get the extra 1-2% power gain. I'm not saying it doesn't work-just saying that I don't need it or care to do it.
     
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  10. RDgolfer

    RDgolfer Active Member

    Which means more explosive...less octane means easier to combust, which is what we are talking about..compression+ignition...so lower octane gasoline "explodes" easier than higher octane gasoline...compression and combustion go hand in hand...so if the atomized fuel combusts early, which means it combusts before full compression, hence knocking...so the tune doesn't match the fuel
     
  11. RDgolfer

    RDgolfer Active Member

    Winter fuel lowers the octane rating
     
  12. RDgolfer

    RDgolfer Active Member

    The octane rating meaning, the higher the octane rating, the less likely it will combust...so it can be compressed more before it explodes...hence, very necessary for a higher compression performance engine..and dvr record
     
  13. Dyn085

    Dyn085 Active Member

    No, it doesn't. It raises the RVP, but is still blended to the same octane. 91 octane is 91 octane, regardless of the blend. I cannot make that any simpler for you.

    I'm playing chess with a pigeon again, le sigh.
     
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  14. RDgolfer

    RDgolfer Active Member

    I can read too..winter grade gasoline with more butane has more of an ability to cause knocking...Is winter gasoline easier to explode due to the butane? It seems so...why does everyone in colder climates change to the 91 octane tune in the winter? Obviously there is a change in how the winter blend gasoline reacts in the combustion chamber...call it whatever you want, but there is a difference....coooooh coooooh, checkmate my little pigeon
     
    Last edited: Nov 18, 2014
  15. Dyn085

    Dyn085 Active Member

    [​IMG]

    No, you're wrong again. Fuel blended with more butane to a certain octane is still that octane-it's just cheaper to produce and has a higher RVP. All that means, because you seem to be confusing the different properties of fuel blends, is that it will evaporate more at a higher ambient temp than a lower RVP blend would.

    Not 'everyone' changes to 91 in the winter, unless you have some actual data to support that. Making things up does not constitute support for your side of the discussion.
    [​IMG]
     
    Last edited: Nov 18, 2014
  16. RDgolfer

    RDgolfer Active Member

    OK, you're right and there is no evidence supporting the premise that engines respond differently to winter gas blends
     
  17. Dyn085

    Dyn085 Active Member

    Feel free to quote where I said that engines don't respond differently to winter blends.

    You make pandas sad.
    [​IMG]
     
  18. RDgolfer

    RDgolfer Active Member

    91 octane is 91 octane is the same regardless of the blend...really? Winter blend gasoline is way different chemically speaking than summer gas...and yes winter gas boils at a lower temperature to aid with cold starting, etc...this means the gasoline is more volatile, even though the additives in the winter blend raise octane ratings...there are many factors in how and when gasoline detonates...and according to my knock counter, I am knocking now, and never did in the summer...changed to Randy's 91 tune running 93 octane, no more knocks...can't argue with data, but post another lame panda picture just to make your self feel better
     
    Last edited: Dec 5, 2014
  19. Dyn085

    Dyn085 Active Member

    Yes, it is 91 octane regardless of blend. If it was say, 89 octane, then it would go into the tank that dispenses 89 octane.

    I never said you weren't knocking, but that is just as much a factor of the tune than it is the octane. You said yourself that you switched to the Cobb OTS tune and had no more knock, which would lead most reasonable people to believe that it was your tune, not your fuel. You now go on to say that with your 91 tune you are no longer getting knock when running 93 octane. Just read that and think about it a little...

    You've proven yourself in many different threads to not know what you're talking about and/or come to the wrong conclusion based on the information you've given. Hell, maybe you're just trying to troll again. It's not a huge deal. If anything it's what many people have come to expect when seeing you bump a dead thread with gibberish.

    Per your request, another panda picture:
    [​IMG]
     
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  20. RDgolfer

    RDgolfer Active Member

    Octane rating is a ratio, not about how much octane is in the fuel...there are may parameters to come to an octane rating...more panda pictures..btw you apparently can't read..I said I wasn't knocking during the summer with Randy's 93 octane bespoke tune, yet it starting knocking with his tune now that winter gas has arrived...you're too "smart" for you own good...more panda pictures...and I have been a member of this site for a long time...calling me a troll is an easy out because I reject your "knowledge"...
     
  21. RDgolfer

    RDgolfer Active Member

    Btw, I started this thread...it was not bumped
     
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