The engine was of conventional construction with a one-piece crankcase and cylinder block in cast iron with the crankcase extending down to the lowest level of the main bearing caps, and with cylinder head also usually in cast iron. Petrol versions were produced in the greatest numbers, but diesel versions exist for both cars and marine applications. 1.5 L and 1.8 L displacements were most common. Displacements ranged widely from 1.2 L to 2.4 L, the latter being an Australia only production six-cylinder variant. The design of this new engine commenced around January 1952, and was designated as the "B" series. Since the A40 Devon engine could not have its capacity enlarged, a new engine was designed, which, although superficially similar, was longer and heavier than the A40 Devon engine. Austin realised that eventually they would need an engine that could power many of its forthcoming medium-sized cars, and this would require an engine of at least 1500 cc capacity. This A40 Devon engine was based on a pre-war Side-valve design. The precursor of the "B" series engine was a 1200 cc OHV engine which was used in the 1947 Austin A40 Devon. The BMC B-series was a straight-4 internal combustion engine family, mostly used in motor cars, created by British company Austin Motor Company.
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