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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #31  
Old 3 Weeks Ago
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previous excerpt:

DOES COIL POLARITY REALLY MATTER?

COIL POLARITY IS ONE OF THE MAJOR CAUSES IN HARD STARTING OR MISFIRING UNDER LOAD OR ON ACCELERATION WHERE THE MOST DEMAND FOR PLUG VOLTAGE IS NEEDED. THIS OCCURS WHEN THE PRIMARY CONNECTIONS TO THE COIL IS REVERSED. THE VOLTAGE AT THE PLUG TERMINALS NEED TO BE OF A NEGATIVE VALUE AND THIS IS AFFECTED BY THE PRIMARY CONNECTIONS.
IF THE POLARITY IS REVERSED, THE CURRENT DIRECTION IS REVERSED ALSO AND THE VOLTAGE TO THE PLUG TERMINALS WILL BE POSITIVE VALUE.
WHY DOES THIS MATTER YOU SAY?
IT WILL DIRECTLY AFFECT THE AMOUNT OF VOLTAGE NEEDED TO FIRE THE PLUGS BECAUSE IT IS MORE DIFFICULT TO JUMP THE GAP AT THE PLUG. THIS LOSS COULD EQUATE A 20 TO 45 % REDUCTION VOLTAGE/CURRENT SUPPLIED AT THE PLUG.
THIS PHENONAMON IS RELATED TO TWO THEORIES: THE ELECTRON THEORY AND THE THERMIONIC EMMISSION THEORY. THE FIRST STATING THAT ELECTRON FLOW IS FROM NEGATIVE TO POSITIVE AND THE SECOND STATING THAT IT IS EASIER FOR ELECTONS TO BE EMMITTED FROM A HOT SURFACE THAN A COLD SURFACE (ELECTRONIC TECH IN THE TUBE DAYS REMEMBER THE HEATERS THAT WERE INTERGAL TO THE TUBE IN ORDER FOR THEM TO WORK).
USING THE TWO THEORIES, ELECTRONS WILL LEAVE A NEGATIVELY CHARGED AND HOTTER SURFACE EASIER THAN IF REVERSED. WITH PROPER COIL POLARITY, THE CENTER TIP IS NEGATIVELY CHARGED AND IT RUNS WAY HOTTER THAN THE PLUG SHELL. SINCE IT IS EASIER TO JUMP THE GAP, THE IONIZATION OF THE FUEL CHARGE WILL OCCUR AT A LOWER VOLTAGE (EVEN LIGHTNING IONIZES THE PATH TO GROUND BEFORE THE ACTUAL STRIKE TAKE PLACE). THIS ALIGNING OF THE CHARGE PARTICLES ALLOWS THE SPARK TO PASS THROUGH THE HIGH RESISTANCE OF THE GASES IN THE CYLINDER.
IF THE POLARITY IS REVERSED, THE CENTER TIP BECOMES POSITIVE AND THE SPARK MUST COME FROM THE COOLER PLUG SHELL AND THIS COUNTERS BOTH OF THE ABOVE THEORIES AND AS WAS MENTIONED AT THE OUTSET, A GREAT LOSS OF IGNITION POWER WILL OCCUR.


will have to convert doc to jpeg to post next excerpt but will be forthcoming.
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  #32  
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excerpt from prior posting



so why does it seem that there is reverse fire when the plugs are out the head????

also why can today's coils be used without regard??? there are simple answers.
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