Research and development engineers at BMW AG have gone back more than 80 years to the era of the Stanley Steamer car to revive steam-engine technology, providing its contemporary gasoline engines with a something-for-nothing power boost. For BMW’s new prototype, exhaust heat – a major untapped source of onboard vehicle energy – is used to generate steam. The steam, in turn, is fed to a rotary expansion unit coupled to the engine crankshaft. Laboratory experiments with a production ...

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