You're right, it's not 100% and 0%. There is some force that can go the
other way. I don't know the effectiveness ratio. I do know it's not
much. I've never driven a gasoline engined vehicle that had much engine
braking, even with a manual transmission. The engine is way too low in
compression to give much. A diesel, yes. That's a different critter.
>
> OK, I've been trying to stay out of this thread, but if this is true,
> how is it the engine can slow the car down when the driver lets off
> the throttle? To get engine braking the transmission must be pushing
> against the engine and the engine must be resisting the force through
> the torque converter. This is true without regard to whether a
> modern, lock-up converters is being used or not. Torque converters
> must be capable of transmitting torque in both directions or there
> would be no engine braking effect. There may a difference in
> efficiency between the two directions, but its clearly not 100% one
> way and 0% the other.
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