Posted by John T on December 27, 2007 at 07:33:14 from (66.244.83.147):
At the risk of boring any non sparky types and NOT to start any fights lol I LOVE these deep technical n theoretical electrical discussions where we can alllllllll learn and/or help educate others.
OKAY over the years Ive seen several different internal coil wiring diagrams WITH TWO DIFFERENT CONNECTIONS:
On both, of course, one end of the the high voltage winding terminates out the top high voltage output tower. BUT heres the differences.
A) Some show the other HV winding end connected internally at the coils + terminal.......
B) Others show it connected internally at the - terminal................
NEXT I hope we alllllllll agree the coil will still produce a spark regardless if wired at the wrong primary polarity buttttttttttttt the coil is more efficient and can impart more spark gap energy discharge across the plugs gap IF WIRED AT THE CORRECT POLARITY.
NEXT I hope we alllllllll also agree its easier to emit electrons from a hotter (plugs electrode tip) to a relatively colder (plugs ground strap) surface. That the reason why in a vacuum tube theres a heater under the cathode where electrons are emitted up to the cooler plate anode (hope I got that right lol been a while since Purdue)
SOOOOOOO QUESTIONS FOR DISCUSSION
1) Hows about those different coil diagrams Ive seen?? That just a misprint n if not are some for Pos others for Neg ground or what alls going on anyway?????
2) Does the coil work best at the correct polarity cuz reversing its primary polarity connection causes a reversal in the current flow direction over in the HV secondary n its easier for current to flow from the hot tip to colder ground strap ORRRRRRRRRRRRRR does swapping the + and - primary polarity coil connections change the HV secondary current flow at all???
3) If changing the primary polarity dont affect the HV secondary current flow, then perhaps its the old right hand screw rule of electromagnetic field North/South polarity and the coils internal winding geometry n turns direction that makes it more efficient if used at the correct polarity. Any agreement or thoughts??????????
FOOD FOR THOUGHT
Ive never done it but a friend has used the lead pencil test in an open 1/8 inch space made in the spark plug wire circuit where one can observe curent flow direction from the lil carbon sparky flow direction. He informs me the spark plug circuit current flow CHANGES if you swap the coil leads. He also indicated if the coil polarity is correct the plugs firing voltage is a few thousand volts LESS then what it is when wired backwards. That confirms what Id think we allllllll agree on its best if wired right, Im just trying to figure out all the reasons why.
Sorry if this bores others, if I had all those neat books our friend jd has Id read up on this.
FWIW I still believe after alllllll the other pages fun discussion that typical 12 volt IHC n Deere n others thirties thru fifties coils that ARE NOT the old ones like jd showed and DO NOT have the seperate internal compartment as indicated by that ring on the outside achieve their apporx 3 ohms of primary resistance (one thing that makes em for 12 volt use) because of more wire or more turns instead of any internal discrete ballast resistor. HOWEVER I dont doubt the ones jd showed, Im ONLY saying most that dont have the internal compartment or arent the older ones he showed are still NOT internally ballasted, just use more primary wire i.e. more primary resistance...... Thats my story n Ima stickin to it lol
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