Posted by jdemaris on August 09, 2008 at 05:37:55 from (67.142.130.11):
In Reply to: What does posted by superpunchy on August 09, 2008 at 02:31:17:
It's a way to compare all tractors with fuel efficiency in mind. Obviously, "miles per gallon" would't work well - especially with PTO work involved.
An old John Deere B, or a Ford 8N will run a four or five foot brush hog more efficiently than some of the newest and highest rated turbo-diesel tractors. It's nice to have the tests so you can compare.
If you look at the complete tests - and NOT the abreviated tests that are often reprinted - they can tell you a lot. Many modern tractors with the highest claimed fuel-efficiency are absolute dogs when used at lower power levels. So . . . if you read the full tests, you can figure what tractor is best suited for the type of work you want to do. For example, and old Ford flathead, gas engine 8N can run a 4 or 5 foot brush hog more efficiently than a new 150 horsepower turbo-diesel Deere tractor. That because most tractors that are very efficient when worked hard, are inefficient when used a low power.
One example - running a 5 foot brush hog that might need 15-25 horsepower, The higher the number, the more fuel efficient. An old Deere B or Ford 8N is almost twice as efficient as a new 160 horse Deere in this situation:
Deere B - 11.7 test rating Ford 8N - 11.1 test rating New Deere 7630 turbo-diesel - 6.5 test rating.
1947 John Deere B (two cylinder gas) tested making 25.79 horsepower for two hours and got a rating of 11.79. At 18.7 horse it was 10.9. At 14.8 horsepower it dropped to 9.5. At 12.8 horse it was 9.2, and when worked at only 6.4 horsepower it dropped way down to 6.
2007 John Deere 7630 turbo-diesel. When worked at 161.8 horsepower it is rated at 18.16. When worked at 92 horse it drops to 14.3. When worked at 62 horse it drops to 12.4. When only worked at 31 horsepower it drops way down to 7.6.
Note that an 8N Ford can make 25 horsepower with a rating of 11.l horsepower hours per gallon.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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