4bt cummins mpg4/14/2023 The lack of power from this engine means it isn’t used much in vehicles and is more so reserved for stationary commercial equipment.ĭespite the 4BTA producing more stock power, the 4BT is still the engine of choice for swaps. This is a naturally aspirated version of the 4BT that only produces 53hp. There is also a less popular version of the engine, known as the 4B. Additionally, the 4BTA changed designs to use 4-valves per cylinder compared to the standard 2-valves per cylinder used in the 4B and 4BT. The 4BTA uses an air-to-air intercooler and more aggressive tuning which allow it to produce more horsepower and torque than the non-intercooled 4BT version. The “A” stands for after-cooled which is synonymous for an intercooler. The primary difference in the 4BTA is that it includes a factory intercooler. The “T” stands for turbocharged – both engines use the same turbo. 3.9L Cummins Engine Specsīoth the 4BT and 4BTA are extremely similar. The 4BTA, launched in 1998, was increased from 8 valves to 16 valves, improving performance to 170hp and 420lb-ft of torque. The 3.9L Cummins 4-cylinder had two variations: the 4BT and the 4BTA. The 4BT is essentially the exact same as the 5.9L Cummins 6BT (12v), just minus two cylinders.
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