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 - 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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