What specifically was different between the 16's and the
From the tear downs I've done on both:
1. KDS-16 had a Mallory rapid advance timer vs. the KDS-17 Singer rapid advance timer. The Singer timers were used from there on out on the Superbas (and also used in many other laundry automatics from the late 70's on with Whirlpool being one of them). KDS-17 timers are easier to change out than on the KDS-16 due to the integrated wiring harnesses, but get more difficult on the later Superba machines with the timer being moved to the door on the KDS-18.
2. 16 had a solenoid, single door detergent dispenser, vs. the dual door, bi-metal heater latch assembly used on the 17. The 17's style dispenser was used from there on out. I really wish they would have kept the solenoid dispenser and would have designed dual doors, however it would be much more expensive to produce.
3. Cycles are slightly different between the machines, however I'm too lazy right now to get the books out to break out the cycles. Cycles change from machine to machine, as well as model to model.
4. Not a huge deal breaker, the but door handles are different between the 16 and the 17. The 17 is a much thinner handle than the 16, with the 16 being identified by having LIFT engraved in the handle - exposed in the locked position.
From what I've been able to tell, the racks are the same. The single wash arm assembly is the same for the 16/17. The heater assembly and wattage are the same for the Superba lines. The rinse dispenser is the same.
Between the racks and the motor/pump/wash arm assembly, you would be lead to believe that they have the same wash-ability. The KDS-16 I parted it was trashed so I was never able to use it, but I can't imagine that it would have been much different than the 17. The build quality and material quality could be argued to be higher on the 16, but doesn't mean that quality wasn't there for the 17's. Look how many are still in use in their original installation points.
The KDS-15, however, was much more different than the 16/17, with the exception of the detergent dispenser being carried over from the 15 to the 16.
Ben