GAPPING SPARK PLUGS

摘要

For a long time, the copper core spark plug ruled the roads. For under a dollar, you could buy a plug that would fit, but you had to gap the plug the correct distance between the electrodes yourself. This was due to differing ignition system designs with different output voltages. You could even adjust the gap to suit modifications to the vehicle. But the softer electrodes made of copper, chromium or nickel-iron tended to erode every time the spark plug fired. Eventually, the gap would open up or the shape of the center electrode changed to the point where it would cause a misfire.