Posted by John T on February 04, 2021 at 10:50:22 from (174.227.143.210):
In Reply to: External coil on a mag posted by Charlie M on February 04, 2021 at 06:04:43:
One MAJOR disadvantage of using a regular external coil is now you need sufficient external battery/charging power to produce a spark. A mag can work on non battery equipped tractors and produces its own energy (not connected to nor dependent on battery) but if you use battery power to operate it (like with an external coil) and the battery is completely dead and there's insufficient charging to power it up YOURE DEAD IN THE WATER.
If you add an external coil (powered by battery) and just use the mags points as a current switch, sure it can work but you loose the advantage of a true mag that doesn't use or have to rely on a battery or charging to operate.
Similar to professor Jims note, a distributor can have an advance timing curve subject to RPM while a Mag HAS ONLY TWO TIMING POINTS Start (around TDC) then Run (maybe 20 to 30 BTDC) with no in between
John T Live in the RV from Dunnellon Florida farm days
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