Re: That's a bit silly

Posted by jdemaris on July 16, 2007 at 07:13:40 from (69.67.229.143):

In Reply to: Re: That's a bit silly posted by Tramway Guy on July 16, 2007 at 06:14:16:

My International Harvester B-275s have the CAV inline pumps with pneumatic governors. In regard to fuel efficiency, they test just as well as many other similar sized diesels with wide-open air intakes. B275 has been tested with a 33 horse load and a fuel efficiency of 14.3 horsepower hours per gallon of diesel fuel.
Now compare that to a similar sized diesel with wide-open intake - a Deere 1020 diesel - loaded at 39 horsepower it runs an efficiency of 14.7 horsepower hours per gallon.
Many similar sized diesels with open-air intakes are worse on fuel - e.g.
Allis Chalmers D15 36 horse 12.7 HHG
(I won't list more, there are too many)

One big advantage to diesel - is the fuel weighs more than gasoline - i.e. there is more fuel in a gallon and more BTUs.

My main point was - and is - most diesels are only efficient at certain power loads and RPM ranges. You might have a large tractor that is highly efficient when being worked at 100 horsepower, but the same tractor when only worked at 20 horse is likely to use a lot more fuel per work done - than a smaller tractor doing the same job - gas or diesel.

Didn't think anybody would try to argue that point. Most farmers I've worked with or known - always had small tractors for light work due to fuel efficiency. My neighbor - year ago - bought two brand new Deere 4020s (still has one). He loved the tractors for heavy work, but always griped about what fuel hogs they were on his silo blower which only needs about 20 horsepower. He finally bought - new - a little 30 horse British Allis Chalmers ED-40, and it did the same job on almost half the fuel.

That's why I posted the Deere specs showing what a dog it becomes when not worked hard. And, those specs are with PTO work loads and have nothing to do with excess tractor weight.

Another example is that of electric gensets. If you take a 60 horsepower 20KW genset and use it to make 500 watts, it is highly inefficient. That because the engine is too big for a small job. A little gas generator rated a 750 or 1000 watts max will make 500 watts using much less fuel - than the large diesel genset.

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