msd44 plug gap

Discussion in 'PSI Superchargers Tech Questions' started by rodschevy, Jun 11, 2007.

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  1. rodschevy

    rodschevy New Member

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    what do you run ?

    i hear .18"
     
    #1
    rodschevy, Jun 11, 2007
  2. blwnaway

    blwnaway Member

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    I run .020
     
    #2
    blwnaway, Jun 11, 2007
  3. fathead

    fathead New Member

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    me too?

    Do you run the NGK 6061?They come shipped with .028 and I look to make sure they're not smashed as I put 'em in.Seems to work ok in a BAE.Should I be closing them up?
     
    #3
    fathead, Jun 11, 2007
  4. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    6061 gap

    .018 is ok, .016 is better...

    your car will positively 100% without a doubt run much better closing the gap to around .016 rather than just running them out of the box.
     
    #4
    Will Hanna, Jun 12, 2007
  5. rodschevy

    rodschevy New Member

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    why is that?
     
    #5
    rodschevy, Jun 12, 2007
  6. funnycarguy 230

    funnycarguy 230 New

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    As It Was Explained To Me Is ... The Amount Of Cylinder Pressure In A Supercharged Engine Tries To Blow The Spark Out with a wide gap that's why you close them up With the fuel under the amount of pressure that it is- a little but hot spark will take care of business. Kinda Like Tring To Light A Match In A Huricane Lol :)
     
    #6
    Last edited: Jun 12, 2007
    funnycarguy 230, Jun 12, 2007
  7. Mike Canter

    Mike Canter Top Dragster
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    The smaller .016" gap works better to help stop miss firing when staging and the initial launch when the fuel mixture is way rich and the plugs are soaked. It makes the car initially more responsive.
     
    #7
    Mike Canter, Jun 12, 2007
  8. M Tigges

    M Tigges TAFC

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    Less gap makes it easier for the electrons to ionize the plug gap under such cylinder pressure.
     
    #8
    M Tigges, Jun 12, 2007
  9. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    exactly

    mark, you hit it exactly. that's why i think these cars would run better with flux capacitors. the less magneto reluctance the better, in my professional opinion....:confused: :confused: :D :D
     
    #9
    Will Hanna, Jun 12, 2007
  10. Micetich

    Micetich Member

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    plug gap

    Spark will take the easiest path. Sometime that path is the next cylinder before it has compression. Result is an oil pan with extra drain holes and one less connecting rod. Running .011 or .012 worked for us.
     
    #10
    Micetich, Jun 14, 2007
  11. eli

    eli Banned

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    One more thing, make sure your heads are grounded all the way back to the coil with a big enough ground strap wire! ;)
     
    #11
    eli, Jun 14, 2007
  12. Brad Hiatt

    Brad Hiatt Member

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    Ground Strap

    Gene,

    What do you consider a good ground wire.

    I am having some problems with reading plugs and could have a ground problem.

    #12 wire, crimped ends (3/8 ring terminals), Both header brackets grounded to the chromemoly motor mounts on the chassis,
    #12 wire, coil to one chromemoly motormount.
    #12 wire, aluminum magneto 3 piece clamp to chassis.

    What is a symbol to look for if you don't have a good enough ground.

    Other than the oil pan "vent holes". Just making 1/8 mile test shots at this time.

    Blown alcohol, late model, MSD 44 combination.

    Thanks,

    Brad Hiatt
     
    #12
    Brad Hiatt, Jun 14, 2007
  13. eli

    eli Banned

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    you need to run braded ground wire from head to head then back to the coil ground termanal. if it's not grounded right you could see arc traces right down into the bearings, check the MSD web site for the size ground strap to use.;)
     
    #13
    eli, Jun 14, 2007
  14. Brad Hiatt

    Brad Hiatt Member

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    Ground Strap

    Could the ground problem cause issues with reading the plugs.

    I have a set of plugs from last 1/8 mile run that look really strange.

    Brad
     
    #14
    Brad Hiatt, Jun 15, 2007
  15. cpgeneration

    cpgeneration New Member

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    Will !!!!! we have a great deal on case lots of flux capicitors, we are also trying to figure out how to make a parabolic mirror set up work with an electric motor instead of using any fuel..:):)
     
    #15
    cpgeneration, Jun 21, 2007
  16. HEMIdude

    HEMIdude New Member

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    Should we run that tight of a gap (.016 - .018) with a promag 20 too?
     
    #16
    HEMIdude, Jun 24, 2007
  17. hemi altered 378

    hemi altered 378 Blown Altered

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    hemidude.........we run a mag 20 on a late model hemi at .018.........works great for us
     
    #17
    hemi altered 378, Jun 24, 2007
  18. nitrohawk

    nitrohawk New Member

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    Anybody out there ever done any dyno work in this area? Of course I guess we are talking about a blown alcohol motor here?
     
    #18
    nitrohawk, Jun 25, 2007
  19. HEMIdude

    HEMIdude New Member

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    Nirtohaek... yes it's a blown 526 with an SCS 1471.
     
    #19
    HEMIdude, Jun 25, 2007
  20. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    plug gap on a/f

    when i started working on an a/fueler i asked what gap...was told pretty much whatever they come out of the box. i asked again, what specific gap...was told 'around' .030

    if an a/fueler makes a good run, you quickly realize plug gap must become pretty irrelevant pretty quick as it burns most of the electrode off, making it a glow plug at some point.

    however, an a/fuel plug can serve as a great prank for an alcohol car owner...

    after my former car owner harry got me pretty good on an april fools prank during the houston weekend, i went over to reichert and got a plug that had burned down about 2 or 3 threads and stuck it in my pocket. i made sure i was pulling plugs after a run and pulled an ol switcheroo and stuck reichert's plug in the plug rack...with an 'oh $hit' and quickly called harry over. rode it out as far as i could then threw him the normal plug...priceless...:D
     
    #20
    Will Hanna, Jun 25, 2007
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