Reply To: 1929 Johnson A-45 Spark Plug Wires / Coil

[jeff-register]

Bucc,
Interesting about the glass insulators. When I did high voltage terminations with neon (15,000volt) it required a 1.5 inch clearance from a grounding surface. If a guy had to run zero clearance for a few inches the best insulator was a glass tube big enough to slide the wire (G.T.O. ) glass tube only inside the zero clearance area. Neon glass tubes come on all sizes to make an insulator, Just nick with a glass rated file & the tube will break to size required. To remove sharp edge on filed side glass polish with a torch.
I never thought neon glass would ever come up with outboards. I have seen glass tubing, smaller sizes used on one letter to the next instead of using insulated G.T.O. wire as jumpers from letter to letter in a sign. A guy could heat & make small bends for a better fit too. Neon glass has a much lower melting tempature too for easier bending too.
Bet the dielectrics ( insulating propertys ) are better now too. To do it easier look up Super Corona Dope at M.G. Chemicals for one of the best paint on insulating material, comes in small bottles & was developed for high voltage transformers to prevent arcing to ground. Isn’t that what a coil is 🙂 !!

P.S. everything has a magnetic field around ti. Higher the voltage the more pressure. Now take the length of wire next to a grounded surface. The longer the surface the more capacitance or capicity the grounded surface absorbes the energy that is for other uses like a spark plug. Keep all high voltage wires from grounded surfaces as it WILL rob energy for the spark plug. Same theory as the magneto capacitor but different playing field. I know, LONG WINDED