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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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