4.5L Cummins

QSB4.5 Cummins Turbodiesel

Like the Cummins 4BT, the QSB 4.5L is based on 5.9L architecture. The engine shares the same bore diameter as the 4BT (3.9L) and 6BT/ISB 5.9L. However, the QSB 4.5L features a much longer 5.39" stroke, versus the 5.9L/3.9L's 4.72" stroke. The engine was designed for industrial applications, though it has attracted some attention for engine swaps. In terms of its likelihood for a conversion, the largest downfalls are the electronic controls and relatively low availability.

4.5L Cummins QSB Specs

Configuration:

Inline 4 cylinder, B series engine family

Displacement:

275 cubic inches, 4.5 liters

Bore x Stroke:

4.02 inches x 5.39 inches

Injection:

High pressure common rail, up to 1,600 BAR

Aspiration:

Holset Turbocharger, intercooled.

Weight:

745 lbs (wet)

Horsepower:

110 - 173 hp @ 2,200 - 2,500 rpm

Torque:

305 lb-ft @ 1,500 rpm

 

Cummins QSB 4.5L Dimensions

Length

Width

Height

32.2"

28.1"

34.5"