I searched a little and discovered a very ingenious closed circuit engine with sufficient efficiency and acceptable volume to propel a car. Moreover, they present his photo in situation in version three cylinders under the hood of a VW. Pressure starts and rises in 30 seconds. As fast as diesel!
They are already known for their Steamcell cogeneration system for residences.
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http://www.enginion.com
Do not hesitate to call on google other sites which speak about them: it is worth it even if instant translation is not easy to decrypt.
: Rolleyes: