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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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