No argument from me. A self-contained magneto with a working spring-loaded impulse does not rely on good cranking speed to make good spark. A tractor with a battery ignition does, and a 6 volt system is apt to have worse spark when cold-cranking, then a properly designed 12 volt system. In fact, even some new cars with "high tech" electronic, high-energy igntions will not fire at all when cranking voltage drops below 9 volts.
One drawback to self-contained magnetos is that most are limited to 15,000-20,000 volts of max spark energy. Some older machines at times need more, and some do not. A good 12 volt battery igniton typically can make 30,000 - 40,000 volts. Your statements rely on tractors being in "perfect" tune. I suspect many are not, though. Having extra spark energy with fouled spark plugs can often make the difference of a running tractor - versus a non-running tractor.
And with generators versus rectified alternators? There is no comparison when it comes to output and efficiency. An alternator is far superior. All depends if somebody actually needs it or not. I'm sure many old tractors don't.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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