It's actually bizarre how quickly and smoothly a new direct injected Mercedes restarts. It literally starts on the first piston coming over. And with no engagement or disengagement noise. Once we finally go with a BLDC motor on the flywheel like the Insight had, there will be no moving parts and we can eliminate the starter and the alternator and have some mild hybrid.
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There are some companies persuing a belt drive high voltage starter/ charger.
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I once saw an engine with a collision damage to the block being run with no oil in it to make sure the insurance company would total it. It ran at 3,000 rpm for two hours and never would give any signs of giving up until they let out the coolant.
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