How do I tell if the engine is a Big Cam or Small Cam The engine serial number is 10246363. Old school truckers and farmers all loved the Cummins 855 Big Cam because of its simple design and reliability all the while producing some major horsepower and torque to get the job done. I just purchased a 1972 Kenworth W900 with an NTC-350 Cummins. Presented at 28th Annual SAE Milwaukee Lecture Series, 17 April 1980. The Big Cam 855 replaced the Small Cam 855 of the 60s and in fact was the first engine designed to meet the new updated mandates of the Clean Air Act of 1976. Engineering Know-how in Engine Design, Part 28," Warrendale, Pennsylvania, 1980, pp 39-47. Published in HS-030 592 (SAE-SP-467), "The Piston Engine-Meeting the Challenge of the 80's.Future developments (Big Cam III in 1982 and New Engine in 1984) are indicated a 10% mpg gain is targeted for the 1984 engine over the equivalent Big Cam II model.
A 15% fuel economy improvement was realized in the 1975-1980 time frame. The NT-855 is traced from its pre-1975 version with a rated speed of 2100 rpm (Small Cam), through the 1975 introduction of the Formula rating in which rated speed was reduced (1900 rpm) while maintaining rated power output, to the 1976 Big Cam-Formula (1900 rpm) and 1979 Big Cam II-Formula (1800 rpm) versions. Examples of its application are commercial heavy-duty trucks (bulk of the market), large articulated farm tractors, commercial fishing boats, and generator sets (standby or continuous duty).
The current model, the Big Cam II, is a turbocharged, four-stroke, in-line, six-cylinder engine with 855 cu. Improvements since 1957 in the Cummins NT-855 heavy-duty diesel engine are described. 1973 Kenworth K100, 350 small cam Cummins Engine, 13 Spd Manual Transmission, 309k Mi, Nation Wide Delivery Available. EVOLUTION OF THE NT-855 ENGINE (HEAVY-DUTY DIESEL)
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