Posted by Janicholson on December 28, 2012 at 16:39:27 from (74.60.94.18):
In Reply to: Long arcing sparkplug posted by pete hall on December 28, 2012 at 16:09:22:
When a spark coil is saturated with magnetism and the points or electronic switch break (mag or distributor are the same in this regard) the magnetic field collapses. as it does so the voltage in the spark wire/s builds up until the voltage at the widest gap is sufficient to start a cascade of electrons making a plasma trail of super heated air (spark). If the plug is fouled, the voltage can bleed off and or the spark is along the surface of the insulator to ground, and not out in the fuel/air mix. When a person puts a wider gap in the spark path, the voltage must rise above the gap resistence and when it does it is far higher than it was just with the fouled plug. This higher voltage jumps that gap and is high enough to jump to the ground electrode and fire the cylinder. Cleaning the plugs (heating it to near red with a propane torch on a fire brick to burn out fouling can work. New plugs are a better choice. Fixing the engine to reduce oil consumption is best. Jim
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