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 - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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