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| Video: Moar water powered powar. |
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Hydrogen is not great for internal combustion engines because the flame front is much faster. Therefore the combustion speed and, as a result, the peak cylinder pressure are both higher. More pressure means more stress in the piston and con-rod, meaning that, for the same output power, a hydrogen powered ICE would need to have heavier internals, compared to a gasoline or diesel counterpart. AFAIK hydrogen fuel cells are a better way of using hydrogen than an ICE. Here's a pretty good video on hydrogen fuel cells: |
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