Generally speaking, a generator wastes half the power it could potentially make due to it's lack of recfifiers. It's like having a four cylinder engine that only fires on two cylinders. It also relies on the charge output to be carried by brushes which presents a wear and design problem. Alternator makes full use of its potential and does NOT use brushes to carry charge output. That is a HUGE advantage.
As as far as 6 volt versus 12 volt, they are not equal. They could of been, yes, but for the most part, things never evolved that way. Most 6 volt starters with the proper sized batteries do NOT have equal cranking torque and RPM when compared to their 12 volt counterparts. But, some of that is due to better design over time, and not just the voltage differences. With 6 volt starters, there were size limitations to get more cranking power. As the voltage climbs, more cranking speed can be made in the same physical size starter.
One example is these two Delclo starters used on the Continental Z134 gas engine. 6 and 12 volt versions:
Delco 1109457 6 volt - no load - 5.7 volts, 60 amps, 6000 RPM.
Delco 1107654 12 volt - no load 10.3, 75 amps, 6900 RPM
Both have equal 11 ft. lbs. of torque when completely locked and not turing, but other wise the 12 volt starter always turns the engine faster.
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Today's Featured Article - Tuning Up Your Tractor: The Battery - by Curtis Von Fange. Buried somewhere beneath the sheetmetal, under the gas tank, or stuffed in front of the radiator is the battery. This elusive and neglected component of the tractor is the hardest to get to when it is dead and in need of a jump. But usually, the storage battery is a storehouse of electrical energy waiting to be released a the flick of a switch. A few maintenance tips and periodic cleaning will keep it charged for the duration of its life span. The battery is made up of a number of lead bas
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