Bmc 2.2 Commander Manual
A sectioned illustration of the Austin A40's 1200cc engine - the direct predecessor to the B-Series. The precursor of the 'B' series engine was a 1200 cc engine which was used in the 1947-1952, and, in slightly modified form, in the 1953. This engine had the same basic dimensions as one of Austin's pre-war engines but to an all-new OHV design which had many features copied from the used on military trucks that the Austin works had overhauled during the Second World War. These features included the valve gear and especially the siamesed cylinder head ports. 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. Since the A40 Devon engine could not have its capacity enlarged, a new engine needed to be designed and built.
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The design of this new engine commenced around January 1952, and was designated as the 'B' series. Although superficially similar, it was longer and heavier than the A40 Devon engine. A major advantage was that it could be bored out, whereby the piston cylinders diameter could be increased to provide a larger capacity if needed. Originally of approximately 1.2 Litre capacity, later displacements ranged widely from 1.2 L to 2.4 L, the latter being an Australia only production six-cylinder variant. The most common engine sizes were 1.5 L and 1.8 L and saw service in a number of vehicles. This included a version of the engine built under license in by for its Ambassador series of cars. Versions were produced in the greatest numbers, but versions exist for both cars and marine applications.
Construction The engine was of conventional construction with a one-piece and in cast iron with the crankcase extending down to the lowest level of the main bearing caps; with a, also usually in, and a made from pressed. Early engines used a three-, but later engines used five bearings. On all except the rare twin overhead variant, the camshaft — which was chain driven and mounted low in the block — operated the overhead valves via pushrods and rocker arms. The two inlet ports in the non- were shared between cylinders 1 + 2 and 3 + 4 and the three between cylinder 1, 2 + 3 and 4.
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Clearance was adjustable by screws and locknuts on the. Another unconventional characteristic of the engine is that the bore spacing is not constant between all four bores. The distance from cylinder 1 to 2 is 3.4375'; 2 to 3 =3.875';and 3 to 4 =3.4375'. The B-Series shares many design features (such as the heart-shaped combustion chambers and siamese inlet ports designed by ), as well as its basic layout and general appearance, with the smaller. However another difference was its block's full-depth skirt which provided excellent bottom-end strength. This made the engine highly durable and suitable for developing into diesel versions in later years. Engine types 1.2 litre engines The 1.2L (1199.6 cc) version was the first version of the engine.
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The bore was 65.5 mm (2.58 in) and the stroke 89 mm (3.5 in). The maximum power output was 39 (29 kW) at 4300 rpm. After the formation of (BMC) the new B Series engine was used in the following vehicles:. 1954–56.
1954–56. 19 (used unique '2G' engine prefix). Combine Harvester 1.5 litre engines.