Posted by MarkB_MI on December 25, 2020 at 03:08:48 from (174.230.4.43):
In Reply to: H.p. at lower rpm posted by 300jk on December 24, 2020 at 10:05:07:
One more thought. For the most part, it's torque, not speed, that creates wear and tear on the engine and drive train. More torque means more pressure on parts that wear, such as bearings and gears. If a tractor's engine is operated at a lower speed than rated rpm, horsepower is reduced but not necessarily torque. So engine life might not be increased all that much by operating at a lower power setting.
Another reason often given for operating at reduced power is improved fuel consumption. But if we go back to the Nebraska test and check out the section "Varying Drawbar Power and Fuel Consumption with Ballast", we see that specific fuel consumption at 100 percent power is 0.618 lb/hp-hr, but at 75 percent power it increases to 0.669 and at 50 percent it's up to a whopping 0.778 lb/hp-hr. Even though fuel consumption is much less at reduced power settings, less work is getting done so the tractor burns more fuel and takes longer to do the same work as it would at 100 percent power. One might think this behavior is peculiar to the gas tractor, but a check of the diesel tractor test shows the same thing.
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