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Re: My fascination with the Mag
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Posted by Janicholson on August 05, 2007 at 06:19:48 from (71.87.39.51):
In Reply to: My fascination with the Mag posted by Mike CA on August 05, 2007 at 00:00:39:
Mags are great for situations in which the operation of the tractor (or vehicle) needs to happen with or without a battery. Mags that were used on letter series (and earlier) were not able to provide one essential ingerdient, that is variable timing of the spark after startup. This factor alone would be the reason many were replaced. As the engine starts, at very slow crank speeds, the impulse coupling holds back mag rotation until TDC or a bit later. This allows the coupling a chance to windup a spring that releases causing the mags internal permanent magnet generator to make sufficient voltage to prep the mags coil for firing when the points break. The coupling is centrifugally controlled such that when the tractor starts, the impulse coupling is taken out of play, and the speed of the mag rotation is sufficient to make it spark as above. The timing is then advanced, due to the fact that the impulse coupling is not active, and is set (on these mags) at a advance useable at all (usually higher) engine speeds. Thus the mags timing is not able to adjust for Idle operations and points between. It is also not as flexible in total advance, because the ideal total high speed advance would be too great for the tractor to run well at idle. (and mag equipped tractors often do not idle well as it is) For a parade type tractor (not a trailer queen) I would keep the more satisfactory distributor setup. JimN
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