Hi Philip, cannot comment on newer models 4 cyl vs 6 cyl but I know what happened to two neighbours several years ago. One had IH 656U Diesel 6 cyl D-282(not turned up) and the other had IH 684 D-239 with T/A turned up to 70 HP PTO on the Dyno. The neighbour with 656 used to chop the neighbor with 684 silage each fall with NH Super 717 chopper. Neighbour with 656 retired from farming and sold NH chopper, blower and wagons to neighbour with 684. The 684 would run the chopper OK on the level but if there was a hill in the field and a partial load in the wagon the 684 had to pull the T/A where as the 656 chopping the same field would have just blown a bit of smoke and continued. Neighbour traded 684 for CIH 4230 D-268 Diesel with over 70 HP.
Conclusion the 6 cyl had more lugging power than the 4 cyl of same HP range.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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