Cummins B Series engine

Cummins B-Series Engine
6.7 Euro 4 / 4+
Overview
Manufacturer	Cummins
Also called	4B/4BT/4BTA 6B/6BT/6BTA ISB QSB
Production	1984–present
Layout
Configuration	I4, I6
Displacement	3.9 L (3,922 cc; 239.3 cu in) 4.5 L (4,460 cc; 272.2 cu in) 5.9 L (5,883 cc; 359.0 cu in) 6.7 L (6,690 cc; 408.2 cu in)
Cylinder bore	102 mm (4.02 in) 107 mm (4.21 in)
Piston stroke	120 mm (4.72 in) 124 mm (4.88 in)
Cylinder block material	Cast iron
Cylinder head material	Cast iron
Valvetrain	Cam-in-block 2 (B-Series) or 4 (ISB, QSB) valves/cylinder
Compression ratio	17.2:1, 17.3:1, 17.5:1, 19:1
Combustion
Turbocharger	Holset Engineering (variable)
Fuel system	Common rail high pressure direct injection, symmetrical combustion chamber with 7-hole injectors
Management	Bosch mechanical with electronic advance
Fuel type	Diesel
Oil system	Wet sump
Cooling system	Water cooled
Output
Power output	53–420 hp (40–313 kW)
Torque output	265–1,075 lb⋅ft (359–1,458 N⋅m)
Dimensions
Dry weight	1,100 lb (499 kg)
Emissions
Emissions control systems	Electronic fuel control, DPF and EGR

The Cummins B Series is a family of diesel engines produced by American manufacturer Cummins. In production since 1984, the B series engine family is intended for multiple applications on and off-highway, light-duty, and medium-duty. In the automotive industry, it is best known for its use in school buses, public service buses (most commonly the Dennis Dart and the Alexander Dennis Enviro400) in the United Kingdom, and Dodge/Ram pickup trucks.

Since its introduction, three generations of the B series engine have been produced, offered in both inline-four and inline-six configurations in multiple displacements.