The Cummins engines in trucks are as follows-the L10 is a 10 liter engine that is mechanical, although there were a very few of the later ones that had Cummins Celect electronics, it is no longer produced new. The M11 is an 11 liter that is basiclly a "hopped up" L10. Most M11 engines were Celect or Celect Plus electronicly controlled. Also no longer available new, discontinued a year or two ago. These were good engines in vocational type applications, transit buses, concrete trucks, etc. Probably a little underpowered in over the road semis. Horsepower in the 280 to 330 range.
The 855 (cubic inch) was the flagship engine from the 70's thru late 80's. 290 to 444 H.P. and big torque numbers. The early one were called "small cam" and the later were called "big cam" due to the size of the cam journals. Good old mechanical engines, no real problems, good for 6 to 700,000 miles, roll in a set of bearings and go again. Also not available new.
The N14 is an electronic version of the 855, 14 liter=855 inches. Rock solid, million mile engine, also not available new but still a lot on the road and highly sought after. HP numbers from say 330 to 525. Big torque numbers up to 1850 ft/lbs.
ISX is a 15 liter full electronic engine, HP up to 600 and 2050 torque. Early ones up 2002 model year no emissions. 2002 to 2006 had EGR. 2007 to 2009 had EGR and exhaust aftertreatment, 2010 to present had the above plus diesel exhaust fluid. The more emissions the less the reliability. If I was in the market an N14 or early ISX would be my choices.
That's Cummins truck engines in a nutshell, hope that gives you something you can use.
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