Cummins ISB

The Cummins ISB is one of the largest straight-6 engine ever produced for passenger vehicles. When the B5.9 was improved upon with the Interact System, the product was the ISB.

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.

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 NV5600. 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, again increasing power output. 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.

The improved high output 600 version was on the Ward's 10 Best Engines list for 2004.

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

Models

 * ISB 185
 * ISB 200
 * ISB 215
 * ISB 230
 * ISB 245
 * ISB 260
 * ISB 275