It's hard to get accurate readings with the equipment they use and the relatively small numbers being measured. The PTO dynos are only good for relative comparisons of tractors on _THAT_ dyno. (As Tractor Vet illustrates) A 3hp error is 10% on a 30 horse tractor and 10% error either way is unacceptable from a scientific standpoint.
Weight, weight distribution, engine torque and powertrain momentum all contribute to pulling performance.
At the temple tractor show I always see a crowd gathered around the dyno as they "test" various tractors. I went and looked at it during the lunch break and noticed that with no tractor hooked up at all, the battered looking needle on the gauge was showing 10 hp. How meaningful was any reading on that dyno? Pretty worthless if you ask me.
Attention to detail can make one run better than the other. You can have a 281 with propane head and this and that, but if the valve job is poor or if the rings aren't sealing it won't do you much good. Carefully assembled and tuned stock parts can make a big difference.
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Today's Featured Article - Talk of the Town: Best Tractor? - by Staff. This recent discussion on the Tractor Talk discussion board here at the on-line magazine drew quite a bit of response. We see the question of "Which tractor is best for me?" asked quite often. We thought you might find the responses interesting. As always, the names of the people participating in the discussion have been left out - we did not request their permission to reprint their names in this article. However you can find this discussion in it's entirety in the Tractor Talk archives.
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