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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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