how a stall converter works?
01-06-2007, 11:00 PM
#11
Pro. B.S. caller outer
Join Date: May 2004
Location: IL
Posts: 9,644
RE: how a stall converter works?
It is not anywhere near as violent as dumping the clutch. As simple as I can say it stall speed is related to torque peak. Engines that make their power peak higher in the RPM range need a torque converter that stalls higher. Different stall speeds are needed because every combination is different and things like gear, cam, tire size andtorque peak all affect how high a givin converter will stall.
01-06-2007, 11:02 PM
#12
5th Gear Member
Join Date: Nov 2004
Location: Texas
Posts: 3,834
RE: how a stall converter works?
For the purposes of explanation, a torque converter can be considered to have three stages of operation:
[ul][*]Stall. The prime mover is applying power to the pump but the turbine cannot rotate. For example, in an automobile, this stage of operation would occur when the driver has placed the transmission in gear but is preventing the vehicle from moving by continuing to apply the brakes. At stall, the torque converter can produce maximum torque multiplication if sufficient input power is applied (the resulting multiplication is called the stall ratio). The stall phase actually lasts for a brief period when the load (e.g., vehicle) initially starts to move, as there will be a very large difference between pump and turbine speed. [/ul]
[ul][*]Acceleration. The load is accelerating but there still is a relatively large difference between pump and turbine speed. Under this condition, the converter will produce torque multiplication that is less than what could be achieved under stall conditions. The amount of multiplication will depend upon the actual difference between pump and turbine speed, as well as various other design factors. [/ul]
[ul][*]Coupling. The turbine has reached approximately 90 percent of the speed of the pump. Torque multiplication has ceased and the torque converter is behaving in a manner similar to a fluid coupling. In modern automotive applications, it is usually at this stage of operation where the lock-up clutch is applied, a procedure that tends to improve fuel efficiency[/ul]
[ul][*]Stall. The prime mover is applying power to the pump but the turbine cannot rotate. For example, in an automobile, this stage of operation would occur when the driver has placed the transmission in gear but is preventing the vehicle from moving by continuing to apply the brakes. At stall, the torque converter can produce maximum torque multiplication if sufficient input power is applied (the resulting multiplication is called the stall ratio). The stall phase actually lasts for a brief period when the load (e.g., vehicle) initially starts to move, as there will be a very large difference between pump and turbine speed. [/ul]
[ul][*]Acceleration. The load is accelerating but there still is a relatively large difference between pump and turbine speed. Under this condition, the converter will produce torque multiplication that is less than what could be achieved under stall conditions. The amount of multiplication will depend upon the actual difference between pump and turbine speed, as well as various other design factors. [/ul]
[ul][*]Coupling. The turbine has reached approximately 90 percent of the speed of the pump. Torque multiplication has ceased and the torque converter is behaving in a manner similar to a fluid coupling. In modern automotive applications, it is usually at this stage of operation where the lock-up clutch is applied, a procedure that tends to improve fuel efficiency[/ul]
01-06-2007, 11:11 PM
#13
2nd Gear Member
Join Date: Aug 2006
Posts: 317
RE: how a stall converter works?
lift has nothing to do with stall speed. its lobe seperation and duration.. converter is basically a fluid cuopling that multplies tourque.
ORIGINAL: MACDRIVE
A stall torque converter lets your engine get up to speed before the engine and transmission are engaged. You would use a stall converter when installing a high lift cam in order to regain low end torque that is lost by installing the high lift cam.
A stall torque converter lets your engine get up to speed before the engine and transmission are engaged. You would use a stall converter when installing a high lift cam in order to regain low end torque that is lost by installing the high lift cam.
01-06-2007, 11:41 PM
#14
5th Gear Member
Join Date: Oct 2006
Posts: 2,424
RE: how a stall converter works?
props, thats a good explination
ORIGINAL: gspfunk
For the purposes of explanation, a torque converter can be considered to have three stages of operation:
[ul][*]Stall. The prime mover is applying power to the pump but the turbine cannot rotate. For example, in an automobile, this stage of operation would occur when the driver has placed the transmission in gear but is preventing the vehicle from moving by continuing to apply the brakes. At stall, the torque converter can produce maximum torque multiplication if sufficient input power is applied (the resulting multiplication is called the stall ratio). The stall phase actually lasts for a brief period when the load (e.g., vehicle) initially starts to move, as there will be a very large difference between pump and turbine speed. [/ul]
[ul][*]Acceleration. The load is accelerating but there still is a relatively large difference between pump and turbine speed. Under this condition, the converter will produce torque multiplication that is less than what could be achieved under stall conditions. The amount of multiplication will depend upon the actual difference between pump and turbine speed, as well as various other design factors. [/ul]
[ul][*]Coupling. The turbine has reached approximately 90 percent of the speed of the pump. Torque multiplication has ceased and the torque converter is behaving in a manner similar to a fluid coupling. In modern automotive applications, it is usually at this stage of operation where the lock-up clutch is applied, a procedure that tends to improve fuel efficiency[/ul]
For the purposes of explanation, a torque converter can be considered to have three stages of operation:
[ul][*]Stall. The prime mover is applying power to the pump but the turbine cannot rotate. For example, in an automobile, this stage of operation would occur when the driver has placed the transmission in gear but is preventing the vehicle from moving by continuing to apply the brakes. At stall, the torque converter can produce maximum torque multiplication if sufficient input power is applied (the resulting multiplication is called the stall ratio). The stall phase actually lasts for a brief period when the load (e.g., vehicle) initially starts to move, as there will be a very large difference between pump and turbine speed. [/ul]
[ul][*]Acceleration. The load is accelerating but there still is a relatively large difference between pump and turbine speed. Under this condition, the converter will produce torque multiplication that is less than what could be achieved under stall conditions. The amount of multiplication will depend upon the actual difference between pump and turbine speed, as well as various other design factors. [/ul]
[ul][*]Coupling. The turbine has reached approximately 90 percent of the speed of the pump. Torque multiplication has ceased and the torque converter is behaving in a manner similar to a fluid coupling. In modern automotive applications, it is usually at this stage of operation where the lock-up clutch is applied, a procedure that tends to improve fuel efficiency[/ul]
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