Diesel-powered firetruck served department since 1982…
January 14, 2019 | Yahoo News
With all three of the major players in the heavy-duty truck segment offering diesel pickups that have crested the 900-lb-ft torque plateau, it was only a matter of time until one of them eclipsed the magic 1000-lb-ft mark. The 2019 Ram Heavy Duty is the first to claim the title, thanks to a heavily reworked version of the venerable Cummins inline-six turbo-diesel. Hitting the 1000-lb-ft measurement right on the head in its high-output configuration, it enables a Ram 3500 regular cab 4x2 long-box dually equipped with the Max Tow package to tug a ridiculous 35,100 pounds or carry a 6570-pound payload. But there's more to the story than just raw grunt.
Revisions to the Cummins 6.7-liter inline-six turbo-diesel are significant. Ram claims the new engine is 60 pounds lighter than its predecessor. New pistons, said to be lighter and stronger, utilize low friction rings and ride on new forged connecting rods in a new block made from compacted graphite iron. The new cast-iron cylinder head is home to new rocker arms, exhaust valves, and springs. Compression ratio for the standard output is 19.0:1; the high-output version uses a lower 16.2:1 ratio to facilitate additional boost. Speaking of which, the improved variable-geometry turbo mounts to a new exhaust manifold and is capable of delivering up to 33.0 psi of boost; the intercooler has been enlarged to the point where Ram calls it the largest ever fitted to its diesel pickups. The redesigned fuel-delivery system features a new pump running at 29,000 psi. The standard-duty model is rated at 370 horsepower at 2800 rpm and 850 lb-ft at 1700 rpm; the high-output version clocks in at 400 horsepower and 1000 lb-ft at 1800 rpm.