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Opposed piston technology, meaning the pistons are mounted on top of one another rather than side by side, was largely abandoned in the 1940’s because there were persistent issues keeping the cylinders clean. Now, as means of making aging combustion technology more efficient and running longer, the engineers at Achates Power have been hard at work for over a decade to revive the century-old technology into something that is more cost-efficient to produce, and less wasteful over all. WIRED has the story on how they are doing it.