Quoting Removed, click Modern View to seeSame subject came up on one of the Ford forums last April (I believe) & both myself & Bruce(VA) measured currents, both with regular high current analog meter & with a peak-hold meter. Problem with results is that engine is more or less coasting between cylinder compression strokes & then current really spikes on compression, resulting in 200 to 300 ampere wild meter needle swings!
My ears told me that there is a harder/louder 'hit' & noticeable speed increase with 12 volts. Is it harmful? Can't say for sure whether a pinion moving at higher velocity toward the ring gear is particularly harmful or not, since there is little torque applied until AFTER the ring/pinion are engaged. The gears do have a taper on them, too. The bendix is, prior to engagement, something like a nut (bendix) on a bolt (starter motor shaft), where the inertia of the nut resists turning as the bolt is rapidly spun. So the nut runs up the bolt toward the flywheel and the pinion gear and flywheel ring gear teeth engage with little torque applied at this point. Then the big flat spring on the end of bendix begins to wind up. As it winds, its coils are pulled together, which pull the two parts of the 'dog clutch' into engagement & at that point torque is applied to ring gear by the pinion and cranking begins. Since the gears are already in mesh when major torque is applied, my "opinion" is that the greater torque isn't responsible for tooth edge chipping. Now, if evidence of stripping out entire teeth in numbers, I would expect added torque might be the cause. I don't like the noise either, but not sure it is harming anything.
As for power, the wild fluctuations make it hard to pin down, but judging from the readings, I estimate around 1.5X current at about 1.7X volts at starter for 2.5X power, but I don't see 'power' as the big factor, but rather the "gear engagement prior to major torque application" as being the big factor. Just my 2¢.
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