The 3.9L 4B/4BT/4BTA Cummins is categorized under the B Engine family alongside the 5.9L 6B/6BT/6BTA Cummins diesel engines.
The 3.9L is an inline four-cylinder naturally aspirated (4B) or turbodiesel (4BT/4BTA) that was popular for many step van applications, including bread vans and other commercial vehicles.
Additionally, it has seen broad usage in agricultural equipment. It has also gained popularity as an engine swap into smaller trucks and SUVs.
4B
The lowest powered, naturally aspirated 3.9L Cummins, the 4B, produces 53 hp (40 kW).[1] This variant is most commonly found in equipment such as generators and wood chippers.
4BT
The 4BT is one of two turbocharged variants of the 3.9L B-Series engine. It contains two valves per cylinder for a total of eight. The most common output of this variant is 105 horsepower.
4BTA
The 4BTA is the updated version of the 4BT, also turbocharged, containing four valves per cylinder for a total of sixteen. The most common output of this variant is 170 horsepower.
Construction Machinery Engines 4BTA
Model
Rated power output (kW@RPM)
Peaktorque(Nm@RPM)
4BTA3.9-C80
60@2200
350@1500
4BTA3.9-C100
74@2200
380@1500
4BTA3.9-C110
82@2200
460@1400
4BTA3.9-C125
93@2300
475@1500
4BTA3.9-C130
97@2500
475@1500
Cummins 4BT 3.9L Engine Overview
The 3.9L 4B/4BT/4BTA Cummins is categorized under the B Engine family alongside the 5.9L 6B/6BT/6BTA Cummins diesel engines.
The 3.9L is an inline four-cylinder naturally aspirated (4B) or turbodiesel (4BT/4BTA) that was popular for many step van applications, including bread vans and other commercial vehicles.
Additionally, it has seen broad usage in agricultural equipment. It has also gained popularity as an engine swap into smaller trucks and SUVs.
4B
The lowest powered, naturally aspirated 3.9L Cummins, the 4B, produces 53 hp (40 kW).[1] This variant is most commonly found in equipment such as generators and wood chippers.
4BT
The 4BT is one of two turbocharged variants of the 3.9L B-Series engine. It contains two valves per cylinder for a total of eight. The most common output of this variant is 105 horsepower.
4BTA
The 4BTA is the updated version of the 4BT, also turbocharged, containing four valves per cylinder for a total of sixteen. The most common output of this variant is 170 horsepower.
