Cummins B Series engine

The Cummins B Series is a family of straight-4 and straight-6 diesel truck and industrial piston engines. The B Series is known for displacing "one liter per cylinder" because of the popular 3.9 L straight-4 and 5.9 L straight-6. A 3.3 L straight-4 is also available. The B Series is widely used in many segments, including pickup trucks (the Dodge Ram), buses, military vehicles, and construction equipment.

The engine was originally designed by Cummins and Case Corporation for commercial truck applications, and appeared in a passenger vehicle, the Dodge Ram, in 1989. 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.



B5.9

The 5.9 L B5.9 was the first member of the family to be used in a passenger vehicle. Appearing in the 1989 Dodge Ram pickup truck, it quickly became a popular alternative to the large V8 gasoline engines normally used in full-size pickup trucks.

This engine is also used in the Dennis Dart midibus since 1989 as well as usage in light to medium sized commercial trucks and buses.


ISB

The 5.9 L ISB is one of the largest straight-6 engine ever produced for passenger vehicles, and the improved high output 600 version was on the Ward's 10 Best Engines list for 2004.

One unusual feature of the ISB is that it is a multi-valve pushrod engine design. The engine displaces 5883 cc with a 102.1 mm bore and 119.9 mm stroke. A turbocharger output in the high-compression (17.2:1 in recent versions) Diesel. It is an all-iron engine with forged steel connecting rods, an assembled camshaft, and a cast aluminum intake manifold. The engine is produced in Columbus, Indiana.

There have been several versions of the 5.9 L ISB featured in the Dodge Ram. The ISB was first introduced to Dodge Rams in 1989. The Cummins engine in 1991 got an intercooler. In 1994, the engine changed over to a Bosch model P7100 inline-style injection pump from the previous Bosch VE series rotary pump. Midway through model year 1998, The engine was redesigned as a 24 valve model to meet updated emissions requirements and introduced the Bosch VP44 rotary injection pump (featuring electronic control) to the Dodge application. It produced 235 hp (175 kW) at 2700 rpm and 460 ft·lbf (625 Nm) from 1600 rpm to 2700 rpm when paired with a manual transmission, but was slightly downrated when used with automatics.

In 2001, an optional high output (HO) version of the ISB was introduced, producing 245 hp (183 kW) at 2700 rpm and 505 ft·lbf (686 Nm) from 1600 rpm to 2700 rpm when paired with a heavy duty six-speed transmission. The ISB from previous years remained available, and automatic-equipped engines were now rated the same as manuals.

For the 2003 model year, the Cummins was introduced with Bosch high pressure common rail fuel injection, and again, more power. Midway through the 2004 model year, the Cummins 600 was introduced, producing 325 hp (242 kW) at 2900 rpm and 600 ft·lbf (813 Nm)at 1600 rpm. This high torque output gives the engine its name, and also offers a high specific output of 102 ft·lbf (138 Nm) per liter of displacement.

A 610 version, new for the 2005 model year, pushes torque to 610 ft·lbf (827 Nm).


3.9L/4B

The 3.9L/4B Cummins is an excellent high-torque, low-rpm engine in the same family as the 5.9L Cummins turbodiesels. The 3.9L/4B is an inline four-cylinder turbodiesel that was popular for many step van applications including bread vans and other commercial vehicles. This engine is also used in various industrial and construction applications. With a cylinder bore of 4.02 inches and a piston stroke of 4.72 inches, the engine had a wet weight of 745 pounds. In recent years it produced 130hp and 355 lb-ft of torque.


B4.5

The B4.5S is a straight-4 version of the B Series used in agricultural environments. It produces 80–127 hp (60–95 kW). The B4.5 is structurally similar to the six-cylinder B6.7 with both sharing a 104 mm (4.1 in) bore and 132 mm (5.2 in) stroke.


B6.7

The B6.7S is the latest version of the B Series. It is currently the largest straight-6 engine produced for a passenger vehicle. It produces 350 hp (261 kW) and 650 ft·lbf (881 N·m) in the 2007.5 Dodge 2500/3500 pickup trucks and 305 hp (227 kW) and 610 ft·lbf (827 N·m) in the 2007 3500 Chassis Cab. The B6.7 is structurally similar to the four-cylinder B4.5 with both sharing a 104 mm (4.1 in) bore and 132 mm (5.2 in) stroke.

There are many changes over the previous B5.9 for the Dodge truck, the most obvious being the larger displacement. The new engine also includes a cooled EGR system, variable geometry turbocharger, and a new higher-pressure version of the Bosch direct-injection fuel system.

The Dodge trucks' B6.7 competes head to head with V8 engines offered by General Motors and Ford Motor Company, the Duramax and 6.4 L Power Stroke, respectively. All three engines have nearly identical power and torque output specifications and will be released within six months of each other.

Both the B4.5 and B6.7 are used in DAF Trucks' LF45, and LF55 and CF65 range respectively.