In the single-piston designs, the engine captures the heat lost from the four-stroke Otto cycle or Diesel cycle and uses it to drive an additional power and exhaust stroke of the piston in the same cylinder in an attempt to improve fuel efficiency and/or assist with engine cooling. These engines can be divided into two groups based on the number of pistons that contribute to the six strokes. Claimed advantages may include increased fuel efficiency, reduced mechanical complexity and/or reduced emissions. The term six-stroke engine has been applied to a number of alternative internal combustion engine designs that attempt to improve on traditional two-stroke and four-stroke engines.
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