You've missed 3 very important things here. What is the hp hrs per gallon of fuel for both examples, & what percentage of the engines produced hp ends up available at the drawbar. In simple terms, which machine is more efficient? If the 4230 & the double R get the same work done at the same speed but the R's do it on 2/3 the fuel, they are then also doing more work on the same fuel. Thirdly, slippage in the field effects the ability to do work , the speed at which it's done, & the gallons burned to do it. So in many cases, 75 hp can & does out work 100 hp. The hp rating of the engine is far from the machines ability to do work as a whole. I do fully understand torque, hp & how they are related & inter-dependent. But you are ignoring real-world performance , which again has many factors involved beyond an engines hp rating.
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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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