A torque converter is either a locking torque converter, or non locking. Locking torque converters are useful to fuel economy because they provide a direct link to the trans (no fluid coupling) when locked. They are locked by the external application of controlled hydraulic pressure on internal clutches (or magnetic systems using electricity) these have nothing to do with the reality of a ""stall" converter.
An engine produces a torque curve as it accellerates (or tries to) from idle. If coupled to a torque converter that is held stationary on its output shaft (stalled)by the transmission, (or in the case of a dynaflow buick, direct to the driveshaft clutch), the output turbine is stationary. The input (cover and input turbine) is spun by the flex plate. AS engine torque increases, its speed increases. This RPM increase continues until the torque multiplication of the convertwe at stall prevents further rpm increase. (Mutch heat is generated doing this because the entire engine output is being converted to heat.) A 2000RPM stall speed thus depends on a specific engine HP and torque curve to be met. It will change its measured "stall" speed with different engines based on that factor alone. A high "stall" converter just lets the engine spin higher into its HP curve than a low speed "stall" converter. It will also allow higher engine speeds due to fluid dynamics thab a low stall converter. This does reduce MPG and produces more wast heat. If it is also a l;ocking converter, when locked it is not a High Stall anything. There are complex torque converters in those buicks. a simple fluid coupling is not used today for automotive applications. Jim
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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