Quoting Removed, click Modern View to seeIt made sense when you said that increasing the field current and speed could allow you to produce 12V with a generator rated for 6V. Whether the generator could handle the extra heat depends on the generator. I believe you did it with a particular 6V genny, but not all 6V gennys can handle the load.
As for the CCA rating, that tells you something about how long it can keep cranking. The starter motor will draw the amperage needed to turn the engine. It will not draw the amperage available. I hook half horse motors to the grid all the time and they never put out 1.7 gigawatts.
E=I x R so I = E/R
As long as the starter motor is turning there is resistance, and the amps flowing will be a function of the voltage and resistance. The starter wattage depends on the starter, speed, voltage at whatever amperage the battery is putting out. The fact that the 6 Volts x 625 Amps battery can produce 3750 Watts for 30 sec does not mean that your starter can or will put out 3750 Watts.
CCA is a measure of the battery power available for 30 sec before the voltage drops below the minimum for the test. Fewer amps, more time. CCA only tells you about how long it can keep cranking. 650 amps for 30 sec is 19500 amp seconds. If the load is 200 amps, it will crank for about 100 seconds before the voltage drops below the test limit.
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