An engine comprising contraction-active ion-separating means. According to the invention said means consist of a plurality of folded plates (10), which at one end are attached to a stationary rigid network (11) and at their other end are attached to a movable rigid network (12). Above the plates (10) valve means (13) are located, which permit to flow over the plates (10) alternately a first liquid rich in ions and a second liquid poor in ions, whereby the plates (10) alternately are contracted and extended. In connection to said movable rigid network a mechanically movable member actuated by the movements of the plates is provided for withdrawing mechanical energy. According to a preferred embodiment said plates (10) are located in a vertical plane, said valve means (13) located above said stationary rigid network (11), and the mechanically movable member (14) located below the movable rigid network (12).
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