Rolls-Royce B range engines

The B range of engines were all of the inline configuration, with crossflow inlet-over-exhaust cylinder heads and were naturally aspirated.

The engines were designed to produce relatively high power outputs (for the time), while being extremely reliable and running on low grade "pool" petrol.

The engines were available in 5 main models, which were fitted to small to medium tactical vehicles, up to about 13 tonnes in mass.

Depending on the fitment of the engine, different accessories may also be installed so, for example, a B80 Mk 6A from an Alvis Saracen is not directly interchangeable with a B80 Mk 6A from an Alvis Saladin, as the Saladin is fitted with a high output 70A generator, and has different mounts for the engine, water piping, accessories and hydraulic system.

Rolls-Royce were unable to cope with production at this rate and the Austin Motor Co were granted a licence to produce B40 Mk.5A engines, and also loaned tooling.