BMC B-Series engine
Infobox Automobile engine
name = B-Series
manufacturer = BMC
type = in line 4
production = 1954–80
displacement = 1.2 – 2.4 litres
block = cast iron
head = cast iron
valvetrain = pushrod or overhead cam
coolingsystem = water
similar = The BMC B-series was a
straight-4 internal combustion enginefamily, mostly used in motor cars, created by British company the British Motor Corporation(BMC), as a larger alternative to its A-series. Displacements ranged widely from 1.2 litres to 2.4 litres, the latter being an experimental six-cylinder variant. 1.5 litre and 1.8 litre displacements were most common. Petrolversions were produced in the greatest numbers, but dieselversions exist for both cars and marine applications.
The engine was of conventional construction with a one piece
crankcaseand cylinder blockin cast iron with cylinder headalso usually in cast iron. The sumpwas made from pressed steel. Early engines used a three- bearing crankshaftbut later engines used five bearings. On all except the rare twin overhead camshaft 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- crossflowcylinder head were shared between cylinders 1 + 2 and 3 + 4 and the three exhaust ports between cylinder 1, 2 + 3 and 4. Valveclearance was adjustable by screws on the rocker arms with access to the tappets by two side covers on the engine block, this feature being a hang over from side valve engine design.Fact|date=June 2008
There were two series of engine numbers used; BMC changed the system at the end of 1956.
Early numbering system
Numbers were of the style "BP15GB" followed by a serial number, where:
* B = B series engine
* P = Pushrod
* 15 = capacity
* G = MG (for full list see Later numbering system below)
* The final letter is the version of the engine.
1957–70 numbering system
Numbers were of the style "15GB-U-H" plus a serial number, where:
* 15 = capacity
* G = MG (other letters were: A = Austin, B = Industrial, H = Miscellaneous, J = Commercial, M = Morris, R = Riley, V = Vanden Plas and W = Wolseley )
* B = B series engine
* U = Central gear change (other letters were: A = Automatic, M = Manumatic clutch, N = Column change, O = Overdrive and P = Police)
* H = High compression (alternatively L = Low compression)
1970 onwards numbering system
Numbers were simplified to "16 V" plus a serial number, where 16 represents the capacity and V = vertical, "i.e." longitudinal (in-line, not vee-arranged) engine with
rear-wheel drive, and H = Horizontal, "i.e." transverse engine with front-wheel drive.Fact|date=June 2008
There was sometimes a country indicator after the first part of the code, "e.g." "18V-Z" was use for some
United States(except California) MG MGBengines.
1.2 litre engines
The 1200 cc was the first version of the engine and appeared in the 1954
Austin A40 Cambridgeand the 1954 Morris Cowley. The bore was 65.5 mm and the stroke 89 mm. The maximum power output was convert|40|bhp|abbr=on at 4300 rpm for the Austin and convert|42|bhp|abbr=on at 4500 rpm for the Morris.
* 1954–56 Austin A40 Cambridge
1.5 litre engines
The 1.5 L (1489 cc) version was first used in 1953 in the
MG MagnetteZA in twin carburettor version and in 1954 in the Morris Oxfordand Austin Cambridge. In 1957 it was used in the original MGA. Output in twin carburettorform was 68 to 72 bhp (51 to 54 kW) and convert|55|bhp|abbr=on with a single carburettor. Bore was 73.025 mm (2.9 in) and stroke was 89 mm (3.5 in).
There was also a diesel version of this engine size. Power output was convert|40|bhp|abbr=on at 4,000 rpm and
torque64 lbf·ft at 1,900 rpm.
Morris OxfordMarks II, III, IV, & V
* 1955–58 MGA
MG MagnetteZA, ZB, & Mark III
* 1956–58 Austin A50 Cambridge
* 1958–61 Austin A55 Cambridge
Morris Commercial J-type
Austin 152& Morris J21/2-ton vans
Morris MajorSeries I & II and Austin LancerSeries I & II
International Harvester"Metro-Mite" delivery truck
* Navigator 1500
TVR GranturaMark I
TVR GranturaMark II & IIA
A special Twin-Cam (
DOHC) version of the 1588 cc B-series engine was produced for the MGA. Output was 108 bhp (82 kW) at 6700 rpm in the high compression (9.9:1) version and 100 bhp (75 kW) in the optional low compression (8.3:1) version. The engine block was cast iron but the crossflow eight port cylinder head was of aluminiumalloy. Drive to the twin camshafts was by chain from a gear driven half speed shaft running in the space that would have been occupied by the conventional camshaft. This engine gained a reputation for being unreliable in service, especially in the high compression version which needed high octanefuel, but this has now been largely overcome. The piston burning habits thought to be the result of ignition timing was later discovered to be due to a vibration induced lean burn situation involving the float bowls, easily correctable by flexibly mounting the carburettors.
A total of 2,111 cars were built, in both coupé and roadster versions.
A very few engines with the special displacement of 1762 cc were produced for racing purposes.
* 1958–60 MGA Twin-Cam
1.6 litre engines
The engine was enlarged to 1.6 L (1588 cc) in 1958 by increasing the bore to 75.41 mm (3 in).
* 1959–61 MGA 1600
TVR GranturaMark II, IIA
Elva CourierMark II
1.6 litre Mark II engines
The engine was enlarged to 1622 cc in 1961 with another bore increase, this time to 76.2 mm (3 in).
* 1961–62 MGA Mark II
* 1961–69 Austin Cambridge A60
* 1961–71 Wolseley 16/60
* 1961–69 Riley 4/72
* 1961–68 MG Magnette Mark IV
Austin 152& Morris J21/2-ton van
* 1974–78 Sherpa van
Hanomag F20, Hanomag F25, Hanomag F30, Hanomag F35
Mercedes Benz L206, Mercedes Benz L306
* Navigator 1600 marine engine
TVR GranturaMark III
1.8 litre engines
The engine was enlarged again to 1.8 L (1789 cc) in 1962. Bore was 80.26 mm (3.2 in) and stroke was 88.90 mm (3.5 in). The engine at first had a 3 bearing crankshaft with a 5 bearing version appearing in 1964.
There was also a diesel version of this capacity, used in the
Leyland Sherpavan, and built under license in Turkeyfor many years.
* 1962–80 MGB
BMC ADO17("Landcrab") Austin 1800
BMC ADO17("Landcrab") Wolseley 18/85
BMC ADO17("Landcrab") Morris 1800
* 1975–78 Princess 1.8
TVR GranturaMark III and IV
Hanomag F20, Hanomag F25, Hanomag F30, Hanomag F35
Mercedes Benz L207
Mercedes Benz L307
2.4 litre engines
There was a 2433 cc six-cylinder unit, named "Blue Streak", which was used in the Australian
Austin Freewayand Wolseley 24/80.
* [http://www.co-oc.org/ Owners' club]
* [http://www.mgcars.org.uk/mgccz/technic/codeseng.pdf Full list of engine codes]
* [http://www.austin-rover.co.uk/index.htm?enginebseriesf.htm B series engine description at "the unofficial Austin Rover resource"]
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