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 - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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