Posted by John T on October 12, 2011 at 04:13:34 from (173.243.181.15):
In Reply to: distributor to mag? posted by mike paulson on October 11, 2011 at 16:51:26:
A Mag is great to have if you have a dead battery and, of course, a necessity for non battery tractors. HOWEVER they in general produce less spark energy then a good working battery powered coil distributor ignition. Mind you they can be designed to produce more energy (hey look at older airplane mags) I'm just saying the run of the mill antique tractor mags dont develop the spark energy as a coil distributor set up. The faster the mag turns the more spark energy while a coil distributor ignition produces the same regardless of tractor RPM provided theres sufficient dwell time. A coil ignition problem, however, can be if the battery is low (esp in 6 volt systems) the available coil voltage is reduced so the starting spark is weak
As Jim noted the main advantage of the coil distributor ignition is the variable advance timing versus RPM function that a mag lacks.
They both have advanatages and disadvantages, your tractor your choice
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