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Category: Cummins diesel engines. ... Cummins X-series engine This page was last edited on 29 December 2013, at 19:49 (UTC). Text is available under the Creative ...
The M123A1 built in the 1960s had a Cummins V8‑300, a 785 cu in (12.9 L) naturally aspirated V8 diesel engine developing 300 hp (220 kW) at 3000 rpm and 580 lbf⋅ft (786 N⋅m) torque at 2100 rpm. This engine was also retrofitted into M123 to make M123E2.
A near unlimited range of engines, transmissions, and rear axles were available for what was usually a built-to-order truck. The biggest diesel available was the Cummins V-903, a giant 903 cu in (14,794 cc) unit with a modest 289 hp (216 kW) max output.
The 6BT 5.9 L (360 cu in) 12-valve Cummins B-series diesel engine became an option in 1989. Sales were good during the Sweptline era and into the late 1970s. A combination of stagnant styling that was nearly two decades old plus brand loyalty primarily to Chevrolet and Ford during the 1980s and 1990s reduced sales volume for the first ...
All models of the M939 share a common basic chassis, cab, hood, and fenders. The basic truck is a 6×6 (three axles, six wheels, all of which are powered) heavy truck. Early M939s were rebuilds of M809 vehicle chassis with a new automatic transmission, transfer cases, cab, and hood. Suffix –A2 are new production with later model Cummins engine.
The single model C-116 Giant was continued in production with the Cummins NTC-290 diesel engine as standard power. Production for 1978 was 131 units. By 1985, the Harrisburg plant was expanded to be able to produce 10 trucks per day, although output continued at about two per day.
A small series of "R-Model Legend" models were built at the end of the RD/RM production run. These models, announced by Mack in 2003, included a special steering wheel, limited edition paint, badges chrome and embroidered seats. [10] Mack was reported to have planned to make 100, but it is unclear how many were actually built. [9]
The F Model offered 5 different diesel engines, Mack's Maxidyne and Thermodyne at 260-375 hp, Cummins - 250-350 hp, Detroit Diesel - 270-430 hp and Caterpillar - 325 hp. Cat3406 is a big-bore diesel available in both high-torque-rise and conventional torque-rise versions; Detroit Diesel 71 series, provided power with a high torque curve.