What are the differences in the engines between these two combines. If you had to rebuild a 1680 engine could you easily make it equal to the 1688 spec. (more power at lower rpm). What other changes are required to the machine to get it to operate at the correct speed.
1688 vs. 1680
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I suppose you could swap out engines or redo all the stuff on the original 1680 one, but you'd also have to change the PTO as the gearing in it is different to compensate for the lower engine speed after they slowed down the Cummins.
At this stage in time, with 1688s being 11-13 years old, and the long sieve 1680s being 13-16 years old, you'd be better off money and effort-wise just trading up to a 1688 instead of making one out of a 1680.
At this stage in time, with 1688s being 11-13 years old, and the long sieve 1680s being 13-16 years old, you'd be better off money and effort-wise just trading up to a 1688 instead of making one out of a 1680.
This is on a long sieve 1680 that has just under 2000 hrs. There are a lot of combines in this area (southern alberta) with not as many hrs on them even though they are 13-14 yrs of age.
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