Tubs,
You are correct they need some mods for the dual fire less expensive coils. I have used radio controlled model airplane fiberglass cloth, very thin material. Put a strip on the outside of the coil & secured with corona dope. Corona dope came out in the 50’s for super insulating liquid for flyback transformers for the high voltage scanning beam for blck & white T.V.s. The flyback output had a bad habit arcing to grounded surfaces & the corona dope cured this. It insulates up to 3500 volts with one application.
After putting a layer of thin fiberglass cloth using a number .16 gauge stranded wire add another layer of corona dope & layer of glass cloth a guy can “clock” the termimals correctly. Ive done this in the past & made dual fire coils into single fire coils by grounding one output terminal with a much hotter fire as the dual fire was made to fire two spark plugs & has many more secondary windings than a single fire coil.
It’s a less expensive coil too. The corona dope can be bought at M.G. Chemicals in a very small container & looks like clear fingernail polish. The very thin fiberglass cloth can be bought on line at a hobby store or on line. M.G. Chemicals no longer call it corone dope As something to do with the word “DOPE” means something “different” than in the 50’s. The thin glass cloth was applyed to R.C. airplanes used with resin to support the bulkhead areas for engine mounting surfaces. Saves much money & can build custom coils for less money & twice the fire.
I knew this would come up but can be modified to purpose. I helped another guy on Johns Old Mercury modifiy his Bendix \Sintilla KF7 & it performed very well at all speeds. Take a look at M.G. Chemicals on line for super insulating coatings please.P,S. Be sure to change the capacitors to match the new coils too. :)!
P.S. If you can find SE-10-56146 Niehoff brand points they fit Bendix too, used in aircraft magnetos too.
Jeff
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