Horsepower is nothing but a calculated number based on torque and RPM, which is a yardstick to measure work performed. Torque actually moves the load. You can have many different HP ratings for the same engine by varying the RPM- which is a way to get around the 50hp mark on compressors & such that is part of the newer regulations- just derate the engine by setting the governor down. John Deere even has nice directions on their website. A 315 and a 350 Cummins are basically the same unit, but the 315 only turns 1800 RPM instead of 2100. A D8 CAT "only" produces around 300hp, but lots of torque- and it turns pretty slow, so the calculated "horsepower" is low
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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