What is the need for different stall rpms? What does the stall mean? I feel like I should know this but I dont . Could some one please educate me on torque converters!
Thanks Mike I just kept it simple wasn't sure how to better define it.Mike Goble said:The 'stall' in stall speed refers to the rpm's at which the motor stalls against the load of the converter and chassis. The same converter will stall the motor at different speeds depending on the applied torque and the load.
Stall speed does not refer to the rpm's you must be going to get the car to move, nor does it refer to some magic happening inside the converter causing it to suddenly work.
These sites have some pretty good explanations of stall speed:
As the duration and overlap of the cam increase the motor will produce less torque at low rpm's. In order to get the engine into the power producing higher rpm range you should install a converter with a higher stall speed. Again, the engine and load determine the stall speed, so what stalls at 3500 rpm behind a torquey 406 may only stall at 2500 behind a high rpm 283. This is why converter manufacturers like to know all about your engine, tranny and chassis.WhitecatD said:why then, do some camshaft grinds require a higher stall?
I think you are assuming a torque converter is like a centrifugal clutch on a mini bike. It's not.arndog said:For a driver Im thinking what you don't want to happen is step on the gas .... torque converter engages and motor bogs ... on the other side you don't want to step on the gas .... wait until motor hits 3500 rpm ... and start to move (unless of course you are racing).