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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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