in turbo-transmissions, the torque-converter is clearly the centerpiece of the entire construction and over the past decades its continuous improvements have been primarily responsible for satisfying the steadily increasing demands of diesel powered vehicles. here, the goal of each improvement has been greater efficiency and better start-up performance, without compromising the start-up converter's dimensions as well as consistent loading of the travel-phase converter when in transit. of the many different torque-converter designs, the single-stage converter using a centrifugal-flow turbine has proven to be the best. it has a relatively simple construction and due to the radial stability of its turbine the converter is well suited for high rpm operations.