Water Methanol Injection Spark Plug Heat Range

Discussion in 'General Supercharger Discussion' started by bigblockragtop, Jan 6, 2015.

  1. bigblockragtop

    I have a street car with a 496 8.5-1 with an 850 C&S blow through carb. I have the Snow kit on it. 99% of my driving is cruising around. I have a LM2 hooked up and cruise in the 13's afr any leaner and it is not happy. Most of my driving is under 2k rpm. The plugs are always black when I pull them and cruising around if I get stuck at a few lights the car kind of needs to clear it's throat so to speak to stop being grumbly. I run ngk9's. I have the w/m injection come on under boost so I guess my question is can I go with a hotter plug to clean things up since I have w/m injection or just deal with it? Also is running a C&S carb strictly street a bad idea? No problem when I step on it so...
     
    bigblockragtop, Jan 6, 2015
    #1
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  2. vinces427bb Staff Member

    i would try a different brand of plug first..
    the plug that cross's over to Champion at a tight gap .030-.032" is what i would try...o_O
     
    vinces427bb, Jan 6, 2015
    #2

  3. bigblockragtop

    I am running a 25 gap now, I was told to go with the small gap so the spark does not blow out. Thanks for the reply!
     
    bigblockragtop, Jan 7, 2015
    #3

  4. vinces427bb Staff Member

    are you using a MSD multispark box or other???
     
    vinces427bb, Jan 7, 2015
    #4

  5. bigblockragtop

    I am using the Mallory Hyfire 6, it has the built in start retard. I run the distributor locked at 36 and pull .5lbs of timing for each of boost, so total is lower then 32 under boost. No signs of detonation, I was told I could run more timing but I do not need more power.
     
    bigblockragtop, Jan 7, 2015
    #5

  6. vinces427bb Staff Member

    I was fouling a lot of the NGK plugs and the shorty ACCELL plugs, [about 40plugs:mad:]
    changed to Champions and they were very resistant to the rich fouling to my surpriseo_O
     
    vinces427bb, Jan 7, 2015
    #6

  7. bigblockragtop

    Very cool definitely worth a shot. Thanks for the quick reply. Is 25 too small of a gap? I was told keep it that way with the blower so they don't blow out.
     
    bigblockragtop, Jan 7, 2015
    #7

  8. vinces427bb Staff Member

    it does sound too small;
    I was told to use .030-.032" for under 15#'s of boost
    less than .030" gap was for hi boost and methanol/E85 fuels...
     
    vinces427bb, Jan 7, 2015
    #8

  9. bigblockragtop

    Well it certainly can't hurt to give it a shot. Thanks
     
    bigblockragtop, Jan 7, 2015
    #9

  10. bigblockragtop

    Just for the fun of it I wrote to ngk and said I am having fouling issues. I was recommended to go with Ur6and gap them at 35. They are an extended tip plug and are hotter then what I am running now. From what I have read this is way off. What does anyone think?
     
    bigblockragtop, Jan 12, 2015
    #10

  11. SCF/HAIC Staff Member Admin

    What kind of boost are you running?
     
    SCF/HAIC, Jan 14, 2015
    #11

  12. bigblockragtop

    I have the d1sc on a 496 so maxed out I see 10-12 lbs of boost. Kind of hard to look down at the gauge but that is my best guess.
     
    bigblockragtop, Jan 15, 2015
    #12

  13. SCF/HAIC Staff Member Admin

    UR6 is one range cooler than stock, I'd consider a 7 heat range, 9 is kind of cold for mid-range boost levels like that. fouling. I'm at 10lbs boost with 2 ranges cooler on my truck, at 9.8:1 compression. Gapped at .035.
     
    SCF/HAIC, Jan 15, 2015
    #13

  14. bigblockragtop

    Also I noticed the ur6 is an extended tip plug, I have merlin cast oval port heads and the heads call for extended tip but I hear to stay away from them on boosted cars although the boost on mine is low so not sure if that would be a problem.
     
    bigblockragtop, Jan 15, 2015
    #14

  15. vinces427bb Staff Member

    what kind of plug tip are you running currently??
     
    vinces427bb, Jan 15, 2015
    #15

  16. bigblockragtop

    5673-8 it is a non extended tip.
     
    bigblockragtop, Jan 15, 2015
    #16

  17. vinces427bb Staff Member

    how long have you had the carb on the engine since you started running it??
    I had a fouling problem and I just had a hellova time nailing down.
    it was the needle and seat sticking intermittently on the primary side of carb...
    I changed them out for new and reset the floats to the exact same level using feeler gages,
    and it was like magic :oops:
    it works like it used to :arghh:
     
    vinces427bb, Jan 15, 2015
    #17

  18. bigblockragtop

    It has always been this way, if I lean it out it will not cruise nice(it will surge). I opened up the iab when I first set up the carb because it ran pig rich.
     
    bigblockragtop, Jan 15, 2015
    #18

  19. vinces427bb Staff Member

    do you have the screw in jets at top of top of carb for the iab and hab ???
     
    vinces427bb, Jan 16, 2015
    #19

  20. bigblockragtop

    No on an aerosol carb they are in the metering blocks.
     
    bigblockragtop, Jan 16, 2015
    #20

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