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This might not be worthy of the Advance Tech forum, but I have no ide what a stall is. Like someone said they have a 3800 stall. What does that mean? I've also heard you need to get a high higher stall when modding the motor. Is this true? I'm confused!
Automatic cars have no clutch to disconnect the engine from the transmission, so a torque converter lets the engine continue to rotate while the gears and wheels stop.
A torque converter is a fluid coupling, which allows the engine to spin somewhat independently of the transmission. If the engine is turning slowly, such as when the car is idling at a stoplight, the amount of torque passed through the torque converter is very small, so keeping the car still requires only a light pressure on the brake pedal.
If you were to step on the gas pedal while the car is stopped, you would have to press harder on the brake to keep the car from moving. This is because when you step on the gas, the engine speeds up and pumps more fluid into the torque converter, causing more torque to be transmitted to the wheels.
The housing of the torque converter is bolted to the flywheel of the engine, so it turns at whatever speed the engine is running at. The fins that make up the pump of the torque converter are attached to the housing, so they also turn at the same speed as the engine.
The pump inside a torque converter is a type of centrifugal pump. As it spins, fluid is flung to the outside, much as the spin cycle of a washing machine flings water and clothes to the outside of the wash tub. As fluid is flung to the outside, a vacuum is created that draws more fluid in at the center.
The fluid then enters the blades of the turbine, which is connected to the transmission. The turbine causes the transmission to spin, which basically moves your car. This means that the fluid, which enters the turbine from the outside, has to change direction before it exits the center of the turbine. It is this directional change that causes the turbine to spin.
Stall is the speed (engine rpm) at which the fluid is being forced to spin the turbine at such a pressure that it essentally locks the engine to the transmission gears. If the tranny gears (and wheels) are not allowed to spin, the engine will stall.
Torque converters with a higher stall will allow the engine to rev higher before launching the car. The higher an engine revs, the more horsepower it generates (to a point), so if an engine is allowed to rev higher before forcing that power to the road, the more power is delivered.
You can also think of it the same way as a manual tranny with a clutch. The higher you rev the engine before feathering the clutch (or dumping it) the more horsepower is put to the road.
I cannot take the credit... Ok, I can but that would be wrong... That comes mostly from HowThingsWork.com. I just added a tiny bit - mostly at the end.
-Eric<br />2002 Navy Blue Camaro...Striped and Stalled. 35th Anniversary SS wheels <br />Best ET: 15.384 @ 88.32 on street tires<br />Project Whitney: Goal, 14.0 1/4 by summer 2008.
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