Posted by jdemaris on December 15, 2007 at 11:11:20 from (67.142.130.35):
We had a discussion a day or so ago in the Deere forum about diesel tractors and efficiency. Also discussed were Deere two-cylinder diesels being high, even by today's standards.
Some of the newest tractors have broken fuel-efficiency records at certain power levels - mostly new Deeres. However, those figures drop like a rock at lower power levels.
Previously, I thought the old Nebraska tests did not check for fuel efficiency at lower power ratings - but I just found out they did. My 1951 Tractor Field Book has complete tests for all tractors that year. Here's a comparison of a 1951 Deere R diesel two-cylinder, with a modern Case-IH CX 50. Efficiency expressed in HHGs - i.e. horsepower hours per gallon.
Deere R diesel 1951: At 43.5 horse it tested at 17.6 HHG At 33.5 horse it tested at 17 HHG At 26.5 horse it tested at 15.5 HHG At 11.3 horse it tested at 11.1 HHG At 1.6 horse it tested at 1.5 HHG
Case IH CX 50 1999: 42.5 horse at 15.2 HHG 37 horse at 14.8 HHG 28 horse at 13.5 HHG 18.9 horse at 11.1 HHG 9.5 horse at 7.9 HHG
Now, also look at the Deere 8520 that is one of the most fuel efficient tractors tested.
Deere 8520 tested 2002 292.8 horse at 18.1 HHG 113 horse at 13.2 HHG 56.7 horse at 11.3 HHG 1 horse at 3/10 HHG (pretty bad)
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