The 4BT is one of two turbocharged variants of the 3.9L B-Series engine. This variant is most commonly found in equipment such as generators and wood chippers. The lowest powered, naturally aspirated 3.9L Cummins, the 4B, produces 53 hp (40 kW). It has also gained popularity as an engine swap into smaller trucks and SUVs. Additionally it has seen broad usage in agricultural equipment. 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. 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 original B Series was updated with 24 valves and an electronic engine management system to become the ISB in 1998.Įngine specifications Engine Specifications Also specified is a deep-skirt engine block and extra-strong connecting rods. It uses a gear-drive camshaft for extra reliability. Įvery Cummins powered Dodge Pickup (since initial production in 1989) has come equipped with a turbocharger. The engine was first manufactured in Rocky Mount, North Carolina, and other plants were later added in Mexico, Brazil, Turkey, and Darlington, UK. Unlike other diesel engines of the time the B-series Cummins used direct injection and did not need glow plugs.

It is also set apart by the use of a shallow one-piece head, requiring closer tolerances than in other Cummins products. The B-series features engine bores machined directly into the block (rather than the wet liners used on earlier Cummins engines). Since its introduction, three generations of the B series engine have been produced, offered in both inline-four and inline-six configurations in multiple displacements. In the automotive industry, it is best known for its use in school buses, public service buses (most commonly the Dennis Dart and the Alexander Dennis Enviro400) in the United Kingdom, and Dodge/ Ram pickup trucks. In production since 1984, the B series engine family is intended for multiple applications on and off-highway, light-duty, and medium-duty. The Cummins B Series is a family of diesel engines produced by American manufacturer Cummins. 2 (B-Series) or 4 (ISB, QSB) valves/cylinderĬommon rail high pressure direct injection, symmetrical combustion chamber with 7-hole injectors

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