Posted by MarkB_MI on July 03, 2013 at 03:39:24 from (75.241.119.175):
In Reply to: fuel efficientcy posted by jerry 4 on July 02, 2013 at 09:47:37:
All other things equal, a heavily loaded engine is more efficient than a lightly loaded one. But tractors are not just engines. Weight has a huge effect on efficiency when we're talking about drawbar power. A small, light tractor is going to have more slippage than a heavy tractor with big tires. To compound matters, the smaller tractor may have to pull an implement at a lower speed than the big tractor. The slower the speed and the lower the gear ratio, the more power is lost to slippage.
In the example you give, pulling a four bottom plow with a typical 60 hp tractor is going to result in a lot of slippage. The 90 horse tractor is going to pull that plow easily and in a faster, more efficient gear. Of course, either tractor can run the hay rake, and the smaller tractor will do it using a bit less fuel. But on average, I'd say the bigger tractor is going to be more efficient.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don�t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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