Reply To: New Coils For An Old ELTO

[jeff-register]

Those Bendix dual fire coils I used in a KF7 Bendix magneto. Soldering to the terminals was easy. Like others I  tinned the wire first, cleaned the soldering tip, dipped in soldering flux & it smoked a little but the flux removes any impure materials, then melted a drop of solder on the tip, & held the tinned wire on top of the terminal, then applyed the heat on TOP of the wire. The melted solder on the tip transferred the heat fast to the wire & the terminal reducing the time & heat to the coil terminal.

Tubs: bolting the lams together is the same electrical connection as bolting two coils to a magneto plate, same same. We used dual fire coils from e bay & moved the nubs (Hi volt terminals to fit our use using 14 gauge wire wrapped around the coil to clock them correctly. First we used very thin fiberglass matting cloth found at hobby shops used for makiing radio controlled engine bulkheads on aircraft as an insulater, then applyed Super Corona Dope, then another layer of thin fiberglass cloth over the wire for more insulating. Did the same for the second terminal which then became the secondary winding ground. We ended up using a dual fire coil to run one cylinder for a much hotter spark as the dual fire has more secondary windings. This worked very  well & was much less money than Bendix coil replacements (When they were still around) The people  at Johns Old Mercury site didn’t believe us at first till a video was shown. I stumbled on the thin fiberglass cloth looking at hobby shops on line. We used fiberglass (C) channel to support 480 volt service sections in the field for metering sections @ 400 amps so I knew the glass colth was a great insulator. Corona Dope came from M.G. Chenicals on line. It was made to keep the scanning beam in a cathode ray tube from arcing to  ground as the flyback transformer made very high voltage. It is rated at 35000 volts & liiks like clear fingernail polish. It was called corona dope but M.G, chemicals changed the name to insulating varnish. Something about the word “DOPE” they didn’t like anymore. In the 50’s it was OK & had a different meaning!! (To fix or repair)