<Tr> <Td> 5.9 - liter B series Cummins <P> Type Inline six - cylinder turbo diesel, direct fuel injection Displacement 359 cu in Bore 4.02 inches (102.0 mm) Stroke 4.72 inches (120.0 mm) Compression ratio 17.5: 1 Max power 215HP at 2500 rpm Max torque 440 lb - ft at 1600 rpm Valve gear In block cam with 2 valves per cylinder Cylinders 6 in line Cylinder head Cast iron Cylinder block Cast iron Camshaft drive Gear driven Crankshaft Forged steel, seven main bearings Engine management Bosch Fuel injection High pressure diesel direct injection Emission control None Emission level? Turbocharger Holset Lubrication system Wet sump System capacity with filter 3 Gallons Cooling system? System capacity incl heater? </P> </Td> </Tr> <P> Type Inline six - cylinder turbo diesel, direct fuel injection Displacement 359 cu in Bore 4.02 inches (102.0 mm) Stroke 4.72 inches (120.0 mm) Compression ratio 17.5: 1 Max power 215HP at 2500 rpm Max torque 440 lb - ft at 1600 rpm Valve gear In block cam with 2 valves per cylinder Cylinders 6 in line Cylinder head Cast iron Cylinder block Cast iron Camshaft drive Gear driven Crankshaft Forged steel, seven main bearings Engine management Bosch Fuel injection High pressure diesel direct injection Emission control None Emission level? Turbocharger Holset Lubrication system Wet sump System capacity with filter 3 Gallons Cooling system? System capacity incl heater? </P> <P> The 5.9 liters (360.0 cu in) 6BT, aka the Cummins "12 - valve" was the first member of the "B" engine family to be used in a light truck vehicle . The 6BT used Robert Bosch GmbH fuel systems, injector, and VE rotary pump and P7100 inline injection pumps . Some early 6BTs were supplied with CAV rotary pumps instead, before the Bosch system became the sole standard . This engine started life in 1984 designed as an agricultural engine, for use in Case agricultural equipment . After 1989, the 6BT engine was used in light duty, medium duty and select heavy duty trucks and buses . </P> <P> Appearing in the 1989--1998 Dodge Ram pickup truck, it became a popular alternative to the large V8 gasoline engines normally used in full - size pickup trucks, since it produced the torque at low engine speeds, and significantly better fuel mileage . During that time, the Dodge Ram was the only diesel pickup that did not rely on glowplugs for cold weather starting . </P>

When did the 12 valve cummins come out