3.9L 4BT Cummins

Related Topics:

4.5L Cummins QSB Specs

4.2L & 5.6L Cummins Specs

2.8L Cummins Specs

12v Cummins Specs











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4BT Cummins

3.9L Cummins Specs & Info







The Cummins 4BT is essentially a 5.9L 12v Cummins with 2 cylinders removed. This 3.9L, 4 cylinder, inline diesel was commonly used in commercial van applications (popular application for Chevy Step Vans), as well as a variety of construction and agricultural equipment. Generous amounts of torque in a small package make the 4bt common for engine swaps in Jeeps & small trucks/suvs.



Cummins 4BT Specifications

Engine Name:

Cummins B3.9L 4BT


Chevrolet Step Vans, agricultural machinery, construction equipment.


Inline 4-cylinder diesel.


3.9 liters, 239 cubic inches.


4.02 inches.


4.72 inches.

Compression Ratio:

17.5 : 1


Turbocharged, non-intercooled.

Engine Weight:

745 - 782 lbs w/ oil.

Oil Capacity:

10 quarts.


105 hp @ 2,300 rpm *


265 lb-ft @ 1,600 rpm *


16,000 lbs.

*Common rating, though horsepower & torque ratings vary by application and model year.


Cummins 4BT Dimensions


30.6 inches


24.6 inches


37.7 inches







Cummins 4BT Info

• Essentially a 4 cylinder version of the 6BT, the 4BT Cummins shares the same pistons, injectors, connecting rods, & valvetrain design as the 6BT (5.9L 12v Cummins).
• Cummins currently manufacturers the 4BT for marine, construction, agriculture, & other off-highway applications.
• 4BT stands for 4 cylinder, B-series, Turbocharged.
• The compact size, reputation of robustness, and abundance of aftermarket upgrades make the 4BT Cummins a popular choice for engine swaps in Jeeps, compact trucks/SUVs, and even half ton pickups.