an energy convertor machine generally includes an elongated member and at least two sets of one or more elastomeric bag members , each elastomeric bag member having a liquid with a low vaporization temperature disposed therein , wherein heating means and a cooling means are provided , wherein one set of elastomeric bag members is being heated while the other set is being cooled thereby causing one set of elastomeric bag members to be expanded while the other set of elastomeric bag members are contracting . a means for rotating the elongated member is provided , wherein the rotating means is activated by the alternate expansion and contraction of the two sets of elastomeric bag members .