The SI6 (Short Inline 6) is a family of straight-six engines developed by Volvo and used by Land Rover and Volvo.

History

Volvo designed the SI6 ("short inline 6") straight-six automobile engine for use in 2007 models. An evolution of the company's long-used straight-five Volvo Modular engine, which itself is an evolution of the Volvo B6304 straight-six engine, the SI6 can be mounted transversely for front wheel drive or all wheel drive applications. Despite the added cylinder and displacement, the engine remains compact, and is in fact 1 mm shorter than the previous straight-five. The engine was initially offered in two displacements — a 3.0 L turbocharged version and a 3.2 L naturally aspirated version. Both offered variable cam timing, though only the turbo version varies both the intake and exhaust valves. On top of the variable cam timing used on the intake cam of the naturally aspirated engine it also had variable valve lift by using Cam Profile Switching (CPS). Production of the Volvo SI6 began at the Ford Bridgend Engine Plant in Wales in May 2006. It was assumed that the engines would be used in European Ford and Jaguar products as well as Volvos.

Nomenclature

The engine codes consist of a series of letters and digits: Engine codes are not necessarily unique to a specific engine as power levels can vary depending on market, manufacturer and model.

3.0

The 2953 cc straight-six engine is intercooled and turbocharged. Cylinder bore and stroke are 82x93.2 mm with a compression ratio of 9.3:1.

B6304T2

The B6304T2 has a power output of 285 PS at 5600 rpm, and produces 400 Nm of torque at 1500–4800 rpm. Applications:

B6304T4

The B6304T4 has a power output of 304 PS at 5600 rpm, and produces 440 Nm of torque at 2100–4200 rpm. Applications:

B6304T5

The B6304T5 has a power output of 350 PS at 5250 rpm, and produces 500 Nm of torque at 3000–4750 rpm. Applications:

3.2

The 3192 cc straight-six engine is naturally aspirated. Cylinder bore and stroke are 84x96 mm with a compression ratio of 10.8:1.

B6324S

The B6324S has a power output of 238 PS at 6200 rpm, and produces 320 Nm of torque at 3200 rpm. Applications:

B6324S2

The B6324S2 has a power output of 228 PS at 6200 rpm, and produces 300 Nm of torque at 3200 rpm. Applications:

B6324S4

The B6324S4 has a power output of 241 PS at 6200 rpm, and produces 320 Nm of torque at 3200 rpm. Applications:

B6324S5

The B6324S5 has a power output of 243 PS at 5600 rpm, and produces 320 Nm of torque at 3200 rpm. In its PZEV version power output is reduced to 234 PS and produces 300 Nm of torque. Applications: Applications: