The Cummins B Series is a family of straight-four and straight-6 diesel truck and
industrial piston engines manufactured by Cummins. The B Series is known for displacing
"one liter per cylinder" because of the popular 3.9 litres (238.0 cu
in) straight-four and 5.9 litres (360.0 cu in) straight-six. A 3.33.3 litres (201.4
cu in) straight-four is also available. The B Series is widely used in many
segments, including pickup trucks (the Dodge Ram), buses, military vehicles,
construction equipment, and marine. Some of the construction and marine applications
have actually featured two B series Cummins engines.
The engine
was originally designed by Cummins and Case Corporation for commercial truck
applications, and appeared in a light-duty truck, the Dodge Ram, in 1989. This
was not the first engine to appear in Dodges as a Diesel option. Mid-70's D models
offered the rare, underpowered, Mitsubishi non-turbo diesel. Every Cummins
powered Dodge Pickup (since initial production in 1989) has come equipped with
a turbocharger. It uses a gear-drive camshaft for extra reliability. Also specified
is a deep-skirt engine block and extremely strong connecting rods. A Holset
turbocharger is used.
The original B Series was updated with 24 valves
and an electronic engine management system to become the ISB in 1998.
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