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- kasabLv 71 decade agoFavorite Answer
Read "Obstacles and problems" in http://en.wikipedia.org/wiki/Crower_six_stroke
It takes time and resources to be developed to something practical.
Edit; Sorry I was not aware that fresh air can be used instead of water with the known complication. If this is possible then why not this engine is developed and put in use for its claimed higher efficiency. I Back your question.
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