Re: Point gap vs timing

Mark Kinsler /
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There are a bunch of different gasoline engine ignition systems, and all of them are pretty strange. Mine is a flywheel magneto, which is extremely clever, cheap, and reliable, but not nearly as simple in theory as some others.

You must begin with understanding how a simple coil of wire and, say, a flashlight cell can produce several thousand volts: enough to give the young experimenter (me) a memorable jolt when the wires are held in the hand and the battery is disconnected from the coil. Every ignition system depends upon this basic principle, for there's really no other way to produce the necessary 12,000 volts for a spark plug.

The ignition points are just a switch whose contacts are exceptionally durable. The coil consists of insulated wire that's wound around an iron bar hundreds of times. We can wind several coils around the same bar. The condenser, or capacitor, consists of two pieces of aluminum foil separated by a piece of plastic wrap, all folded up so it fits in that little round metal case. And there are magnets. That's it.

The magic is in the physics, which tells us that if the amount of magnetism in a coil *changes*, a voltage (electrical pressure) will be produced across the ends of that coil's wire. And: the strength of that voltage depends upon how fast we change the amount of magnetism through our coil.

Mark Kinsler

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  Point gap vs timingTopic by: Mark Kinsler Mark Kinsler 07/26/20 05:43PM
  Re: Point gap vs timingRe: P D P D 07/26/20 06:15PM
  Re: Point gap vs timingRe: Overpriced Parts Overpriced Parts 07/26/20 09:07PM
  Re: Point gap vs timingRe: Dirty30 Dillon Dirty30 Dillon 07/26/20 09:45PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/26/20 10:13PM
  Re: Point gap vs timingRe: Den 23 Den 23 07/26/20 07:17PM
  Re: Point gap vs timingRe: Dirty30 Dillon Dirty30 Dillon 07/26/20 08:54PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/26/20 09:18PM
  Re: Point gap vs timingRe: Den 23 Den 23 07/26/20 11:42PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 05:13AM
  Re: Point gap vs timingRe: Den 23 Den 23 07/27/20 10:28AM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 12:19PM
  Re: Point gap vs timingRe: Richard Eberline Richard Eberline 07/26/20 10:00PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 02:31AM
  Re: Point gap vs timingRe: Mark Anderson Mark Anderson 07/27/20 08:52AM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 12:05PM
  Re: Point gap vs timingRe: Jay Rivett Jay Rivett 07/27/20 09:02AM
  Re: Point gap vs timingRe: P D P D 07/27/20 10:16AM
  Re: Point gap vs timingRe: Mark Anderson Mark Anderson 07/27/20 09:36AM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 12:09PM
  Re: Point gap vs timingRe: Den 23 Den 23 07/27/20 12:40PM
  Re: Point gap vs timingRe: Pushrod Fifty Pushrod Fifty 07/27/20 10:28AM
  Re: Point gap vs timingRe: P D P D 07/27/20 10:46AM
  Re: Point gap vs timingRe: Jay Rivett Jay Rivett 07/27/20 10:53AM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 01:29PM
  Re: Point gap vs timingRe: P D P D 07/27/20 03:57PM
  Re: Point gap vs timingRe: Jay Rivett Jay Rivett 07/27/20 07:12PM
  Re: Point gap vs timingRe: Scott Bard Scott Bard 07/28/20 07:25AM
  Re: Point gap vs timingRe: Den 23 Den 23 07/28/20 08:39AM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 02:08PM
  Re: Point gap vs timingRe: P D P D 07/28/20 08:52AM
  Re: Point gap vs timingRe: Den 23 Den 23 07/28/20 09:12AM
  Re: Point gap vs timingRe: live ɘvil live ɘvil 07/28/20 06:59PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 02:15PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 02:00PM
  Re: Point gap vs timingRe: Mike Boyd Mike Boyd 07/28/20 02:22PM
  Re: Point gap vs timingRe: Dirty30 Dillon Dirty30 Dillon 07/28/20 02:39PM
  Re: Point gap vs timingRe: Richard Eberline Richard Eberline 07/28/20 07:28PM
  Re: Point gap vs timingRe: live ɘvil live ɘvil 07/28/20 07:38PM
  Re: Point gap vs timingRe: Scott Bard Scott Bard 07/28/20 09:36PM
  Re: Point gap vs timingRe: P D P D 07/28/20 10:05PM
  Re: Point gap vs timingRe: Dirty30 Dillon Dirty30 Dillon 07/28/20 10:07PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 10:20PM
  Re: Point gap vs timingRe: Scott Bard Scott Bard 07/28/20 09:40PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 09:47PM
  Re: Point gap vs timingRe: Dirty30 Dillon Dirty30 Dillon 07/28/20 09:48PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 10:04PM
  Re: Point gap vs timingRe: Scott Bard Scott Bard 07/28/20 09:41PM

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