The torque converter (10) includes an elongate housing (12) having a main section (12a) and a collar section (12b). A piston assembly (20) is reciprocable inside the main section (12a). A plurality of elongate helical bolts (22) with outer helix (22a) extends axially from one side of a piston (21). The opposite side of the piston (21) is entirely exposed to hydraulic forces to maximize potential work thereon. The helical bolts (22) are mated with a rotator (31) in a helical rotation assembly (30), converting linear motion into rotation, each mated pair generating a given torque. A torque accumulator (50) combines the given torque to generate total output torque greater than the given torque. One or more output endcaps (60) can be provided on the ends of the housing (12) to produce work from the greater output torque.
