Timeline for Do any torque converters disengage at idle?
Current License: CC BY-SA 4.0
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| Sep 3, 2018 at 23:43 | comment | added | fred_dot_u | Unlocked torque converters are always engaged if the transmission is in gear. As such, the transmission side of the converter is stopped and the engine side is moving fluid into the transmission side, which does, as you suggest, consume some energy. This is part of the reason that automatic transmissions are less efficient than manual versions. In Park and Neutral, the transmission side of the torque converter is permitted to spin at engine speed without sending energy to the wheels. | |
| Sep 3, 2018 at 22:50 | comment | added | feetwet | I am asking about an "unlocked" torque converter. If it is still engaged with the engine at idle (which would be the case unless some extra mechanism is added to "disengage" it) then the impeller is spinning in the coupling fluid at whatever the engine's idle speed is, which must consume some energy. | |
| Sep 3, 2018 at 20:45 | history | edited | Pᴀᴜʟsᴛᴇʀ2♦ | CC BY-SA 4.0 |
deleted 32 characters in body
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| Sep 3, 2018 at 20:23 | history | answered | fred_dot_u | CC BY-SA 4.0 |