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MSD Pertronix buick v6

Discussion in 'Early CJ5 and CJ6 Tech' started by piffey263, Jan 11, 2014.

  1. Jan 11, 2014
    piffey263

    piffey263 Active Member

    Yreka, CA
    Joined:
    Oct 16, 2008
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    1,214
    Hey Guys,

    Got a quick question,

    I installed a pertronix for the buick a while back and installing a MSD now I am using the stock coil for now.

    my question is do I put the red wire (from MSD) that goes to the ignition before or after the Ballast resister? (I have stock coil)

    I put the white wire of msd to the black wire on the pertronix

    Basically followed this
    http://www.pertronix.com/support/tips/pdf/msd6series.pdf

    for future reference is it better to run the MSD coil or the pertronix coil? any opinions


    Thanks guys
     
  2. Jan 12, 2014
    jeepcj

    jeepcj Member

    cincy, Ohio
    Joined:
    Aug 23, 2009
    Messages:
    601
    That's a good question. I would think after the ballast because the ballast drops the volts before reaching the points so the points don't burn up. You no longer have the points so I don't see why you would need to drop voltage anymore, but I really don't know the answer. The instructions don't specify whether a ballast is used or not?
     
  3. Jan 12, 2014
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2020 Sponsor 2019 Sponsor

    cordele, Ga.
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    The diagram clearly shows the red wires going to 12V. Does your original coil have the built in resistor or not?
     
  4. Jan 12, 2014
    piffey263

    piffey263 Active Member

    Yreka, CA
    Joined:
    Oct 16, 2008
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    I actually don't know if it is external or internal

    I go to the website of o'reillys store I bought the coil and it just says 12v doesn't say if it's external or internal. just says it fits my application


    I will search how to check the coil, and try and find out







    Sent from my iPhone using Tapatalk - now Free
     
    Last edited: Jan 12, 2014
  5. Jan 12, 2014
    piffey263

    piffey263 Active Member

    Yreka, CA
    Joined:
    Oct 16, 2008
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    I did some research, that ballast is more for the points than the coil.

    a buick site I was on they where saying its fine if coil gets full voltage it just runs hotter. 165F something like that which is fine.
    found someother website that says same thing.


    Jeep starts now, it runs really smooth and fires up really easy. I like it with MSD, as for the stock coil.
    I am planning on switching coils in near future and if running 12 volts shortens life of the stock coil i'm okay with it.

    I am however going to assume my starter is okay to get 12 volts instead of the 9 after the ballast? any objections
    the ignition wire is just a trigger for starter (like a relay) from my understanding.
     
    Last edited: Jan 12, 2014
  6. Jan 12, 2014
    Danefraz

    Danefraz Well-Known Member 2019 Sponsor

    Chico CA
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    Aug 11, 2012
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    Piff,
    I sent a note to Petronix. Use their coil with their electrics. No ballast needed. Needs to match ohms, I have one on the workbench, don't remember if it's the 1.5ohm, or 2.5 version. Not sure what the msd adds to the mix.

    Not sure about the starter, I'm thinking it would be fine.

    D


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  7. Jan 13, 2014
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2020 Sponsor 2019 Sponsor

    cordele, Ga.
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    That wire from the starter solenoid (R terminal) to the coil + is the ignition bypass and is required to supply 12V to the coil when the ignition switch is in the start position. Some ignition switches have no power to the (I=ign) terminal during the start/crank position. Coils with internal resistor will be labeled (internal resistor) or (for use with external resistor only). If nothing is labled then it is normally taken to be used with external resistor. Coil resistance is measured with OHM meter connected across the neg to pos terminals of the coil and with no wires connected. The value for the 225V 6 pertronix application should be a minimum of 3 OHM's.
     
  8. Jan 14, 2014
    piffey263

    piffey263 Active Member

    Yreka, CA
    Joined:
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    Thanks Walt, I guess I will put the meter on it and then I shall see if I really should put the resistor on it.


    Dane, thats good to know. I recall pertronix said stock coil is fine so does MSD but together its a question also with the ballast thing.

    I will measure the coil, I should put the resistor in if it does need it. It does run really good without it with the ignition combo, its so smooth and quiet now too. I look forward to seeing what a good coil does when I get around to it, but for now stock coil will do.
     
  9. Jan 14, 2014
    Danefraz

    Danefraz Well-Known Member 2019 Sponsor

    Chico CA
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    Thanks Walt. Looks like three on the box on my workbench! I know I sent one back because it was too low.


    Sent from my iPad using Tapatalk
     
  10. Jan 14, 2014
    Danefraz

    Danefraz Well-Known Member 2019 Sponsor

    Chico CA
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    Here it is, found it...

    --------

    You would need Flame-Thrower coil part number: 40511. You will remove the
    resister.


    Marvin Grebow Jr
    PerTronix Inc.
    Technical Department
     
  11. Jan 15, 2014
    piffey263

    piffey263 Active Member

    Yreka, CA
    Joined:
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    I was curious,

    I called them up and sent an email to find out what the MSD adds to the mix. they said use part 45011, but when I called I had the guy explain it to me.

    he says as long as the ignitor is not hooked directly up to the coil, use what ever coil. The 45011 is a .06 ohm coil and you don't need a ballast on it when running the MSD boxes apparently.
     
  12. Jan 15, 2014
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2020 Sponsor 2019 Sponsor

    cordele, Ga.
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    Pertronix and MSD design their coils for several different reasons. One of them is high heat handling ability. The point system coil if reading 3 ohms resistance would pull 4 amps at 12V and if 1.5 ohms resistance it would pull 8 amps at 12V. Amps or Current means heat. So your original coil if it's resistance is 1.5 ohms would get quite hot unless you increased the primary resistance. Kaiser jeep even gives you the required resistance for the ballast resistor.
     
  13. Jan 16, 2014
    Corveeper

    Corveeper Member

    Chanute, Kansas
    Joined:
    Jul 29, 2005
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    817
    The MSD box eliminates the need for a ballast resistor.
    My ignition is a full Mallory system (HyFire CDI box, distributor and coil) which has a bypass plug built into the wiring harness. I kept my ballast resistor in circuit just in case the CDI box ever failed so that I can use the bypass plug without worrying about damaging the electronic module in my distributor.
    Otherwise you don’t need one anymore.
     

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