An auto engine might make it's max rated hp at 4500rpm where-as a tractor engine makes its max power at anywhere from 975 to 2200 rpm. they are made to sustain max power all day long in the field under load and will do it for many many years. Try running a car engine in a tractor in the field under load at 4500 rpm or higher if so rated , and see just how long it will last. If you throttle it back to 2000 rpm to make it last then it won't have enough torque to pull through a mud hole. A car engine is designed to have great reserve power for just short spurts when you need it and the rest of the time it "loafs". Tractor engines are made to work all day and car engines are made to loaf all day unless needed to get through a yellow light or occasional drag race.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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