One can excite electrons with a thousand volts from a cattle prod, but the starter won't spin. Power is measured in watts. Watts is volts times amps. 200 amps at 11 volts while starting gives 2200 watts. So a 12v battery develops enough work effort to spin it well. At 5.5 volts cranking a 6v system to 400 amps, the watts is 2200. Because lower voltages require higher amps, they loose more in motor efficiency and wire resistance losses. 6v batteries have thicker plates, and are subject to the same internal resistance issues. Look at the trend in battery powered hand tools. from the 12 volt tools years ago, we now can find 60 volt battery driven powerhouses. It is delivered energy that makes watts turn starters. Voltage provides that force, through small resistances (way less than an ohm on both 6 and 12v starters) to drive amps making watts. Jim
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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