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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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