Re: 8v Follow up.....

Posted by John T on November 28, 2005 at 12:08:29 from (66.244.90.98):

In Reply to: Re: 8v Follow up..... posted by JT on November 28, 2005 at 11:22:20:

Hey JT, Im NOT here to argue either just to try n help people the best we can. I agree definitely a Mag retards the timing when youre starting her, otherwise when shes slow cranking she would fire like 20 degrees Before TDC causing her to kick the flywheel backwardsssssss and thats a definite NO NO. Butttttttt then when the wind n trip assembly stops functioning (centrifugal force prevents dogs from engaging) the run time advance takes over which allows them to fire maybe 15 to 25 degrees (depends on adjustment) Before TDC as needed, and the rotor is turning at straight speed same as the driver NO WIND UP N TRIPPING OF A SPRING THEN LIKE AT SLOW RPM

HOWEVERRRRRRRRR (Rememeber Im more familiar with JD Mags like the Wico C and X or AP NOTTTTTT the Farmall Mags) I do know for a fact and REGARDLESS what brand of a Magneto, THAT AT SLOW CRANKING SPEEDS THE ROTORS MAGNET DONT PASS BY THE COIL NEAR FAST ENOUGH TO INDUCE SUFFICIENT VOLTAGE INTO THE COILS PRIMARY Sooooooooooooo thats how n why when you turn the mag slowlyyyyyyyyyy its not initially turnign the rotor, but it turns to wind a spring that winds up n then releases to rapidly whirllllllll the rotor at a fast speed past the coil so it does go fast enough to create a good spark.

A battery powered coil ignition uses battery energy n voltage to power up the coil while a Magneto creates its own energy by passing a magnet (rotor) past a coil of wire (the coils primary) to induce voltage and the faster the magnet passes by the coil the greater the voltage BUTTTTTT at real slow passes, theres not enough voltage induced, THEREFORE it needs to wund a spring up n trip it to rapidly whirl the magnet past the coil while its being slow RPM started.

I hope some of the good gentlemen familiar with the Farmall mags will weigh in here to show me right or wrong, but until then "Thats my story n Im stickin to it" lol

Thanks JT, best wishes n God Bless yourself and all else here. Hopefully we can all learn from this fun discussion, thats why were all here and I can learn about farmall mags if they are indeed different concerning how their spring assembly works if its different then the Mags Im familiar with???????????

John T, retired electrical engineer

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