Does the TC constantly transfer the engine power to the input shaft of the transmission. Meaning with it in gear brakes applied there is still a force being acted on the input shaft of the transmission by the engine through the TC.

 

No, not while TC is "stalling"...

the amount of "force" transmitted is a function of input speed (engine speed) and output load (drivetrain/vehicle load)...

if the input speed is too low, or if the output load is too high, then the fluid coming out of the impeller (which is driven by engine) does not have sufficient force to drive the turbine (which drives transmission input shaft)... the converter is in a low speed stall (100% slip), if you like;

if you increase input speed (increase engine speed) sufficiently, or if you reduce the output load (release the brakes) sufficiently, the impeller fluid is able to overcome/drive the turbine.

 

If the converter is spinning, then it is trying to spin the turbine which in turn is connected to the input shaft. It works off centrifugal force, so if the motor is on - the converter is trying to transfer the power. If you are in park the input shaft is spinning, no real resistance to stop it. When you put it in gear you apply the forward clutches which then connects the input shaft and output shaft and you stop the turbine, assuming you are on the breaks. That is why the idle will drop a little when you put it in gear, you are applying a load on the motor. If you have a really high stall converter then there is very little load applied at idle.

Chris

 

Thank you for clearing that up for me. I thought that engine constantly applied force to the input shaft but wasn't sure.

Appreciate it,
Jason