Too look at it one way.. voltage is pressure, and current is flow. An 8 volt battery if charged correctly, will have 33.3% more pressure than a 6 volt battery. And would pull 33.3 % more current assuming your cables are still 6 volt (2/0) cables. SO... by simply making a small adjustment to the voltage regulator, you can.... spin the engine over faster.. meaning that it will develop more compression on a cold crank.. and, it will have enough voltage to have a hotter spark. SO... the engine should... start quicker, with less cranking time. IF your six volt tractor is perfectly tuned and in perfect condition, you will probably see no difference. If your six volt tractor has been down the field many times, you probably will see a difference, mainly on starting times.
Problems with this. most folks replace bad battery cables with small 12 volt cables that only have to carry smaller cranking currents. But with a six volt starter, you must have the very large cables still in place, even with a 12 volt system.
second, they dont adjust the voltage reg up to correctly address the 8 volt battery(9.46 volts), so your not really gaining anything as the battery is under charged, and could actually be worse in this undercharged condition than a six volt that is charged correctly(7.1 volts).
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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