Well . . . sometimes you can, but it's a rare circumstance.
A 12 volt starter motor is designed to work properly at 9-10 volts. Some cars/trucks with light-duty direct-drive starters can be made to have problems when greatly over-batteried and cranking voltage gets up near 12 volts. But, that's pretty hard to do.
One example is my 64 SS Chevelle with a 327. Due to high compression pistons, over-advanced timing specs with a hot cam etc. it was a hard cranker at times. Since I had many big batteries around, I got the bright idea to install two huge tractor batteries in the trunk with 2/0 cable running up front. Cranking voltage jumped from 9.5 up to 11 volts. It made a huge difference in cranking speed. But - no matter what I did, I could not get the Delco starter drives from breaking. Finally went back to one battery and no more failures. Eventualy, I installed a gear-drive starter.
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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.
... [Read Article]
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