Quote:
Originally Posted by rwdkev
So are you saying 827 has an AMT, not a torque converter type....??
|
Yes and no - it still has a torque converter but unlike the majority of automatics, it doesn't use epicyclic gear train sets to get the ratios. Instead of using brake bands to stop the outer planetary ring gear to force a ratio change, it uses hydraulic pressure to activate clutch packs which take the place of the selector forks/rings in a manual box.
This might explain it a bit better :
https://www.lingshondaparts.com/hond...0?mod_01=21340
That's the auto box, i've used the countershaft assembly to illustrate how close it is to a manual box.
By comparison, the manual :
https://www.lingshondaparts.com/hond...1&block_05=hcr
Spot the difference!
Now compare it to this cutaway view of a ZF4HP22 "traditional" automatic box :
As you can see, the planetary gear sets are going to be much heavier, make the box longer and overall, much less efficient. Also the Honda/Rover box has a two-stage lock-up clutch on the torque converter which is handy for improving economy when driving and because of a clever set-up on over-run, gives vastly improved engine braking over the traditional auto box.
