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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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