derwen1959
Member
I have just been watching how do magnetos work on youtube .. can someone explain what happens to the high voltage after it has jumped spark plug gap.. thanks in advance
(quoted from post at 20:10:46 08/20/16) I have just been watching how do magnetos work on youtube .. can someone explain what happens to the high voltage after it has jumped spark plug gap.. thanks in advance
fter jumping the gap, the current keeps on going, thru the base of plug, head, etc., and ultimately completing the loop thru the winding where it originated. Just like the power company's electric current.....they sen it out on one wire , get it back on the other and charge you for pushing it out & back! :twisted:(quoted from post at 20:10:46 08/20/16) I have just been watching how do magnetos work on youtube .. can someone explain what happens to the high voltage after it has jumped spark plug gap.. thanks in advance
(quoted from post at 03:27:47 08/21/16) And did you know the spark polarity outputted by a typical magneto alternates between positive and negative as each successive cylinder fires?
on't let it keep you up at night..........some modern electronic spark engines fire both neg & pos..........they all work just fine. that 40% number keeps growing every time I see it. :wink:(quoted from post at 12:55:10 08/25/16)(quoted from post at 03:27:47 08/21/16) And did you know the spark polarity outputted by a typical magneto alternates between positive and negative as each successive cylinder fires?
That is not good; reverse polarity will need 40% more energy to jump the gap. From what I've read, it's backward when the spark jumps from the ground electrode to the center electrode on the spark plug. The ground electrode is hotter than the center, and it takes more energy to jump off the hotter side. If you had a weak magneto, almost fouled plugs, the engine would miss every other firing.
From your use of 'typical magneto', somebody makes one that doesn't reverse; an I right?
AFAIK, all commonly-produced and sold HT mags "back in the day"
using a rotating magnet fired that way because they fire twice for every revolution of the magnet.
Exceptions would be (typically older) mags with external/horseshoe/stationary magnets, including oscillating magnetos.
uch of it went into the heat that is the "match" that lit off the petrol fire.(quoted from post at 13:22:48 08/26/16) Doesn't it just change into energy which produces work. It does not cease to be just changed. But electricity has always been a mystery to me.
(quoted from post at 13:47:42 08/22/16)fter jumping the gap, the current keeps on going, thru the base of plug, head, etc., and ultimately completing the loop thru the winding where it originated. Just like the power company's electric current.....they sen it out on one wire , get it back on the other and charge you for pushing it out & back! :twisted:(quoted from post at 20:10:46 08/20/16) I have just been watching how do magnetos work on youtube .. can someone explain what happens to the high voltage after it has jumped spark plug gap.. thanks in advance
hile I can't speak for every magneto ever made, those I have held, had the 'generating' portion spin at engine speed and a 2:1 reduction for the spark "distributing" rotor portion. For this kind of design, the answer is yes, every other spark alternates in polarity.(quoted from post at 11:11:50 08/27/16) I can see that for an 'engine speed' magneto; but is it still true for a half speed? In other words, one with a 2:1 reduction gear in the distributor section?
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