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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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