I understand the relationship of higher cranking-voltage equating to faster cranking RPM. I am also privy to the concept of a diesel starting better when cranking faster. My point was and still is . . . you mentioned a minimum of 11 volts. 11 volts (or higher) at cranking is very difficult to achieve in a 12 volt system and that is why 12 volt starter motors are designed to work well down to 9.5 volts. It's also why batteries are typically load-tested at 9.5 volts, not 11 volts.
A typical brand new tractor will crank at 10-10.5 volts in warm weather and 9.5 - 10 volts in cold weather. Getting over 11 volts at cranking would be very difficult and require a huge set of batteries and cables - even in warm weather. And considering a battery loses near half it's cranking capacity at zero F, it would be even more difficult in cold weather.
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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