[tooc]

Is there much difference in performance? what are the main differences? is the threshing system bigger in the 1680?

 

[robmgrig]

The 1680 has a 30 inch rotor vs a 24 inch rotor on the 1660 plus it also has wider sieves

 

[kscombiner]

The 1680 is a lot bigger machine. I would look for the newer models with the long shoe and cummins.

 

[farminflyboy]

Everything is bigger on an 80 series; the sieve is wider the rotor is bigger and the tank is larger. It also has more HP. Considering you usually pay about the same price for an 80 as you do a 60 series, I would always pick the 80 series.