The Tractor Vet has it right. The diesel engine physics is different than the gas. It produces maximum torque at a much lower RPM than a gas job and with far less fuel. As I'm an electrical engineer and not a mechanical engineer I don't have all the answers and don't presume to know things out of my area of expertise. But what I do know is that a diesel under load reacts quite differently than a gas/ignition engine under load. In order to fully understand the physics of each technology you would have to study the HP, torque and fuel usage curves. Not all diesel engines are created equal. Many of the older diesel designs are a bit weak in the torque/lugging department, while the more recent designs are light years ahead. John Deere offers an economy PTO that runs 540 at 1700 engine rpm... and not at 2400 engine RPM..why?.. because max torque is achieved around 1700 and while max HP is achieved near the rated speed of 2400 it is not necessary to power most PTO implements, and I realize a 30-35% fuel savings.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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