Posted by RodInNS on December 19, 2008 at 19:03:02 from (216.118.158.123):
In Reply to: Is it true posted by tork rench on December 18, 2008 at 18:39:43:
I would say that there's good and bad among all of them... but on balance I don't know too many Deere owners around here that rave about how little fuel they use. I know of some that don't do the volume of work we're doing on this farm that use a lot more fuel than we do with a fleet of Fords. Wether you can blame that on the Deere tractors, their work habits or the fact that they're using 3 80 Hp Saran engines to do all their work.... I don't know, but they use more fuel for the farm as a whole.
One thing that bears mentioning about UNLC tests is this: The official test is conducted for maximum power at rated speed.
Some engines are very efficient at that speed and power level. Some are more efficient at lower speeds and power levels. Holding a fuel efficiency record for a tractor that runs at full power at 2500 rpm is all well and good, but if the tractor does all it's work at 1400 when it's well below it's torque curve and performs as a gutless wonder... it's not getting it's best efficiency. I think that's a factor that hits a lot of later Deere engines very hard. They put up some fine numbers on a dyno at maximum power, but get them out in the field doing actual work at varying speeds and loads and their real efficiency drops off somewhat. That's a factor that's not readily shown in the official UNLC tests.
Again, fro what I see of deere's, and those are mostly 30 series and 40 series manheim's, they are not efficient. Not nearly as efficient as comparable size Ford's, IH's, Brown's, Zetor's and Belarus's that are around here. The ruski's were efficient because they were simple tractors with a deep stroke slow revving engines. The browns because of a decent length stroke and smalish displacement/power ratio. The Ford's were decent probably because of their flatish torque curve. They drink it pretty good on the top end. The deere's that I've worked with had pretty narrow, quick torque bands in the higher speed range... so they were destined to run fast and not do much unless they ran fast, and that's probably what kills their efficiency on lighter loads. If you pummeled the crap out of it and ran it hard all day at maximum power it would probably do a lot of work for it's fuel. A perfect example being a dozer...
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