In 1919, Clessie Lyle Cummins drastically improved existing diesel engines which then became Cummins. He was awarded 33 different United States patents for his invention.
Basically, year of manufacture and what emissions regulations they had to fall under. Pre-2003 ACERT motors are your red tops, whereas Cummins designated their line of diesel …motors as a whole new series under the post-2003 regulations (the N14 became the ISX, the M11 became the ISM, the L10 became the ISC, etc.). (MORE)
If you mean "Cummins 5.9L" yes it's a good engine. There is no such thing as a Cummins 6.9L. The 5.9L I-6 Cummins is known as the "B-Series". It was named #10 out of 10 as the… best-diesel engines ever according to Diesel Power Magazine. (MORE)
Ford IS NOT putting Cummins in their trucks. Chrysler Corporation and Cummins Diesel Engines, Inc. just signed a multi-year contract to keep Cummins engines in Dodge Ram Heavy… Duty trucks. You can get a Cummins diesel in a Ford F-650 or Ford F-750. The F-250, F-350, F-450, and F-550 all have the Powerstroke diesel engines. (MORE)