Horse power wise they were rated the same as the six cylinder engine. The do not have as much torque rise as the RPMs drop below rated speed so you may have to shift if the load increases too much whereas the six cylinder will pull down and recover. Another difference is that so many of these IH tractors have the fuel turned up for more power and the six cylinder will out preform the eight cylinder when fueled above factory settings. Even with twin turbos they are no match for the six. When used with factory settings under light or varying loads the eight cylinder will usually do a little better on fuel economy than the six cylinder.
Many people did not like the way the fuel injection pump starts to cut back fuel to four cylinders when used at less than 80 percent load so they had the pumps reworked to always run on all eight. This also resulted in less fuel economy under light loads. At 20 percent or less load the engine is designed to run on four cylinders only. One of the main reasons for this was to keep enough load on those four cylinders so that they would stay at a high enough temperature to achieve full combustion.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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