From Engineering Explained.
Can Opposed Piston Diesel Engines Save The Combustion Engine?
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Opposed piston engines operate similarly to two-stoke engines. When the pistons reach their respective bottoms, fresh air flows in from ports at the bottom, while exhaust is rejected through ports at the top. That fresh air is squeezed into a small pocket in the center of the cylinder as both pistons come together, where finally diesel fuel is directly injected, igniting the mixture and creating the power stroke. This pushes the pistons out, and the cycle repeats itself. This all results in an engine that is small, power dense, and quite efficient.
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