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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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