If you're turning an isx, c15, or dd15 2100 rpm you're gonna keep opec real happy. They work best in the 1100-1500 rpm range.
Even the n14 celect and 60 series work best from 1200-1800.
The old big-cams, a and b models, and 2-strokes, however......
The 12 valve Cummins torque peaks about 1800 and was governed at 2500, but believe it or not, installing the 3200 rpm governor springs will net you better fuel mileage. All 3 heavy-pick-up diesels work best about 1800 rpm and up. The 24 valve will get better fuel mileage at 65 in 4th than 70 in fifth loaded.
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Today's Featured Article - Using Your Tractor: Creating a Seed Bed - by Chris Pratt. When I bought my first old tractor, I had only one idea in mind. It wasn't the preservation of old iron since at that time, I was unaware that people even did this. It wasn't to show off my restoration skills (though I had tried my hand at a couple of old motorcycles in my teens and if I recall correctly, those old motorcycles were sold in boxes about one quarter finished). It wasn't to relive memories of Grampa, Dad or myself out on the back 40 nursing the Farmall pulling too many b
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