The term six stroke engine describes two different approaches in the internal combustion engine, which has had some developement since the 1990s, to improve its efficiency and reduce emissions: In the first approach, the engine captures the waste heat from the four stroke Otto cycle or Diesel cycle and uses it to power an additional power and exhaust stroke of the piston in the same cylinder. Designs either use steam or air as the working fluid for the additional power stroke. As well as extracting power, the additional stroke cools the engine and removes the need for a cooling system making the engine lighter and giving 40% increased efficiency over the normal Otto cycle or Diesel cycle. The pistons in this six stroke engine, go up and down six times for each injection of fuel. These six
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