Where does maximum torque multiplication occur in a torque converter?

Where does maximum torque multiplication occur in a torque converter?

• A. Technician A
• B. Technician B
• C. Both Technician A and Technician B
• D. Neither Technician A nor Technician B

Answer: (A)

Torque multiplication in a torque converter is greatest when there is maximum slip between the pump (impeller) and the turbine, which occurs at stall. When the engine drives the pump but the output shaft isn’t turning (the turbine nearly stalled), the fluid is accelerated and redirected by the stator in a way that transfers the engine’s torque to the transmission with the highest gain. As the turbine starts to spin up with the vehicle, slip decreases, and the multiplication factor falls toward 1:1. In real use, you never reach perfect stall, but the peak multiplication happens near that stall condition.

Torque multiplication in a torque converter is greatest when there is maximum slip between the pump (impeller) and the turbine, which occurs at stall. When the engine drives the pump but the output shaft isn’t turning (the turbine nearly stalled), the fluid is accelerated and redirected by the stator in a way that transfers the engine’s torque to the transmission with the highest gain. As the turbine starts to spin up with the vehicle, slip decreases, and the multiplication factor falls toward 1:1. In real use, you never reach perfect stall, but the peak multiplication happens near that stall condition.