New coil question

Electrical and Ignition

  1. A56

    A56 MoPar Affliction

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    I'm looking to purchase a new stock replacement coil for my 340 cuda and I'm seeing that the coils for sale state that they now have silicone in them rather than mineral oil. Any insight on the reason?
     
    Last edited: Nov 12, 2021
  2. Lefty71

    Lefty71 Well-Known Member

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    :popcorn:

    Do they look like a canister style replacement?? Or are they the iron-stack type (like a transformer)??
     
  3. A56

    A56 MoPar Affliction

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    Stock replacement
    s-l200.jpg
     
  4. 67Dart273

    67Dart273 FABO Gold Member FABO Gold Member

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    I have no experience with them. Modern "E" core coils are typically (I think) all epoxy. Oil was used for HV insulation and heat conductivity. I have no idea what the heat conductivity or insulation of silicone is Might be better, might not

    The disadvantage to oil is that "some" coils if mounted in certain ways, "alleged" can expose the windings above the oil level, but in the day Mopars were mounted both vertically and horizontally, as were Fords. So who knows?

    Of course oil can leak........
     
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    • 67Dart273

      67Dart273 FABO Gold Member FABO Gold Member

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      On a side note about "what is better" "It used to be" in high voltage and high power RF circuits, such things "in the day" as ceramic and mica were considered "the top of the heap."

      BUT it turns out that during WWII some ceramic insulators were manufactured with less--than--ideal base material and did NOT have the insulating/ dielectric properties actually desired!!!
       
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      • A56

        A56 MoPar Affliction

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        My research shows that coils mounted horizontally if they "should" leak would then expose the windings due to depleted content. I thought maybe silicone was the cheap way out and that's why no mineral oil.
         
      • CRUZE 418

        CRUZE 418 FABO Gold Member FABO Gold Member

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        Get an epoxy coil.
         
      • CHARLES FEARNEYHOUGH

        CHARLES FEARNEYHOUGH Member

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        I don't know it this is a reason but Silicone is a K class transformer fluid, meaning it has a fire point above 300C.
         
      • 1969383S

        1969383S FABO Gold Member FABO Gold Member

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        Pertonix III and Flamethrower III coil!

        Shrink wrap the extra dizzy wire and Hide the ballast bypass from behind and Smile! JMO!
         
      • 67Dart273

        67Dart273 FABO Gold Member FABO Gold Member

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        What is a "dizzy?"
         
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        • 1969383S

          1969383S FABO Gold Member FABO Gold Member

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          ? Distributor.

          Have your fun! People who try will understand and drop the Chrysler boxes like a rock! JMO!
           
        • CRUZE 418

          CRUZE 418 FABO Gold Member FABO Gold Member

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          I have the Petronics Flame Thrower, an epoxy coil. Just make sure that you get the correct ohm coil that you need.
           
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          • 1969383S

            1969383S FABO Gold Member FABO Gold Member

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            It is more than That!

            My coil looks totally stock.

            If you follow the recipe from Pertronix it takes all the correct pieces including the Plug wires for total success!

            I ran solid core "Taylor" wires with my orange/chrome and Gold Chrysler boxes. Great results however!

            The Flame Thrower III with resistor core "Taylors" and the rest are superior! Never mind the fact it is all hidden like stock! Again JMO and 30 years!
             
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            • 1969383S

              1969383S FABO Gold Member FABO Gold Member

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              Last word, Maybe!

              Few read the lines and follow through as directed!

              It seems inherent we all want to cheat the system and stop short, and or modify what the Manufacturer tells us!

              In this case do not!
               
              Last edited: Nov 12, 2021
            • Johnny Mac

              Johnny Mac www.blueprintengines.com FABO Vendor

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              I have personally had several oil filled coils leak. I came to like the e core type, but have also found those aren't compatible with certain efi setups. Also have to watch resistance if mixing with old school ignition systems.
              If it's a bone stock build, I would get whatever rock auto special was on sale, and buy a spare with it.
               
            • CRUZE 418

              CRUZE 418 FABO Gold Member FABO Gold Member

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              Also, am I wrong, all electronic ign should be spiral core not solid core wires. Stock electronic Mopar system is a .6 ohm coil? My Mopar electronic dist, I have the FAB ign module, 1.5 ohm Flame Thrower epoxy coil (per instructions) and the Flame Thrower ceramic end spiral core wires.
              Hope we haven't confused the OP. I believe that any .6 ohm epoxy coil would suit his issue.
               
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              • A56

                A56 MoPar Affliction

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                lol, not confused, interesting info thanks
                 
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                • 1969383S

                  1969383S FABO Gold Member FABO Gold Member

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                  Not according to DC in the 70's! Gold and Chrome were Solid core.
                   
                • CRUZE 418

                  CRUZE 418 FABO Gold Member FABO Gold Member

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                  Okay
                   
                • Mike69cuda

                  Mike69cuda 66 is the new 17 FABO Gold Member

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                  I had a coil fail & had to buy one right then. All they had at Oreilly was a masterpro, the house brand. It only lasted a couple months. Took it back and got Standard, thinking it was a good brand. Opened the box & it was the same exact coil. Can’t trust name brands anymore. All Chinese junk. Bought a more expensive chrome coil & it has lasted.
                   
                • 67Dart273

                  67Dart273 FABO Gold Member FABO Gold Member

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                  No, it's not
                   
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                  • 67Dart273

                    67Dart273 FABO Gold Member FABO Gold Member

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                    Unfortunately Standard, AND NAPA Echlin has been shit for a number of years. I've no idea if there is a "good" brand anymore, other than MAYBE finding a late model coil AKA Dodge RAM using a single coil, and buy one from the dealer or good used.
                     
                  • Bewy

                    Bewy Well-Known Member

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                    Pretty sure trans oil is cancer causing, hence now being alternatives being used. TO also has very poor heat con

                    The coil needs to be matched to the ign system. Points, electronic?
                     
                  • A56

                    A56 MoPar Affliction

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                    Yes, my distributor is the stock dual point that it came with in '69.
                     
                  • CRUZE 418

                    CRUZE 418 FABO Gold Member FABO Gold Member

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                    I have been searching for the proper coil for a dual point Prestolite dist, haven't really found an answer. Seems like points want a 3 ohm coil. So I was wrong thinking .6 ohm.
                    Having said all this, we do have a guy here, Halifax? Bet he knows. Why not pm him?
                     
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