BMC A-Series engine

Austin Motor Company's small straight-4 automobile engine, the A-Series, is one of the most common in the world. Launched in 1951 with the Austin A30, production lasted into the 1990s in the Mini. The A-Series design was licensed by Nissan of Japan, along with other Austin designs. That company quickly began modifying the A-Series, and it became the basis for many of the following Nissan engines. ==803== The original A-Series engine displaced just 803 cc and was used in the Austin A30 and Morris Minor. It had an undersquare 58 mm bore and 76.2 mm stroke. This engine was produced from 1952 through 1956. Applications: * 1952–1956 Austin A30, 28 hp (21 kW) at 4400 rpm and 40 ft�lbf (54 Nm) at 2200 rpm * 1952–1956 Morris Minor, 30 hp (22 kW) at 4800 rpm and 40 ft�lbf (54 Nm) at 2400 rpm ==948== 1956 saw a displacement increase, to 948 cc. This was accomplished by boring the block out to 62.9 mm while retaining the original 76.2 mm stroke. It was produced through 1964 Applications: * 1956–1962 Austin A35, 34 hp (25 kW) at 4750 rpm and 50 ft�lbf (68 Nm) at 2000 rpm * 1956–1962 Morris Minor, 37 hp (28 kW) at 4750 rpm and 50 ft�lbf (68 Nm) at 2500 rpm * 1958–1961 Austin A40 Farina, 34 hp (25 kW) at 4750 rpm and 50 ft�lbf (68 Nm) at 2000 rpm * 1958–1961 Austin-Healey Sprite, 43 hp (32 kW) at 5200 rpm and 52 ft�lbf (71 Nm) at 3300 rpm * 1961–1962 Austin A40 Farina, 37 hp (28 kW) at 5000 rpm and 50 ft�lbf (68 Nm) at 2500 rpm * 1961–1964 Austin-Healey Sprite, 46 hp (34 kW) at 5500 rpm and 53 ft�lbf (72 Nm) at 3000 rpm * 1961–1964 MG Midget, 46 hp (34 kW) at 5500 rpm and 53 ft�lbf (72 Nm) at 3000 rpm ==848== The 62.9 mm bore was retained for 1959's 848 cc Mini version. This displacement was reached by dropping the stroke to 68.26 mm. This engine was produced through 1980 for the Mini, when the #A+ version supplanted it. Applications: * 1959–1969 Austin Seven/Austin Mini/Morris Mini, 34 hp (25 kW) at 5500 rpm and 44 ft�lbf (60 Nm) at 2900 rpm * 1961–1962 Riley Elf/Wolseley Hornet, 34 hp (25 kW) at 5500 rpm and 44 ft�lbf (60 Nm) at 2900 rpm * 1964–1968 Mini, 34 hp (25 kW) at 5500 rpm and 44 ft�lbf (60 Nm) at 2900 rpm * 1969–1980 Mini, 33 hp (25 kW) at 5300 rpm and 44 ft�lbf (60 Nm) at 2900 rpm ==997== The one-off 997 cc version for the Mini used a smaller 62.43 mm bore and longer 81.28 mm stroke. It was produced from 1961 through 1964 Applications: * 1961–1964 Mini, 55 hp (41 kW) at 6000 rpm and 54 ft�lbf (73 Nm) at 3600 rpm ==998== The Mini also got a 998 cc version. This was similar to the #948 in that it had the same 76.2 mm stroke but was bored out slightly to 64.58 mm. It was produced from 1962 through 1980 Applications: * 1962–1969 Riley Elf/Wolseley Hornet, 38 hp (28 kW) at 5250 rpm and 52 ft�lbf (71 Nm) at 2700 rpm * 1964–1969 Mini, 55 hp (41 kW) at 5800 rpm and 57 ft�lbf (77 Nm) at 3000 rpm * 1967–1980 Mini, 38 hp (28 kW) at 5250 rpm and 52 ft�lbf (71 Nm) at 2700 rpm * 1969–1975 Mini, 38 hp (28 kW) at 5250 rpm and 52 ft�lbf (71 Nm) at 2700 rpm * 1969–1980 Mini, 41 hp (31 kW) at 4850 rpm and 52 ft�lbf (71 Nm) at 2750 rpm ==1098== The 1.1 L (1098 cc) version was produced for the larger BMC saloons. It was a stroked (to 83.72 mm) version of the #998 previously used in the Riley Elf and Wolseley Hornet. It was produced from 1962 through 1980 Applications: * 1962–1971 Morris 1100/Morris Minor, 48 hp (36 kW) at 5100 rpm and 60 ft�lbf (81 Nm) at 2500 rpm * 1962–1968 MG 1100, 55 hp (41 kW) at 5500 rpm and 61 ft�lbf (83 Nm) at 2500 rpm * 1962–1964 Austin-Healey Sprite, 56 hp (42 kW) at 5500 rpm and 62 ft�lbf (84 Nm) at 3250 rpm * 1962–1964 MG Midget, 56 hp (42 kW) at 5500 rpm and 62 ft�lbf (84 Nm) at 3250 rpm * 1963–1974 Austin 1100, 48 hp (36 kW) at 5100 rpm and 60 ft�lbf (81 Nm) at 2500 rpm * 1963–1967 Vanden Plas Princess, 55 hp (41 kW) at 5500 rpm and 61 ft�lbf (83 Nm) at 2500 rpm * 1964–1966 Austin-Healey Sprite, 59 hp (44 kW) at 5750 rpm and 65 ft�lbf (88 Nm) at 3500 rpm * 1964–1966 MG Midget, 59 hp (44 kW) at 5750 rpm and 65 ft�lbf (88 Nm) at 3500 rpm * 1965–1968 Riley Kestrel/Wolseley 1100, 55 hp (41 kW) at 5500 rpm and 61 ft�lbf (83 Nm) at 2500 rpm * 1973–1975 Austin Allegro, 49 hp (37 kW) at 5250 rpm and 60 ft�lbf (81 Nm) at 2450 rpm * 1975–1980 Austin Allegro, 45 hp (34 kW) at 5250 rpm and 55 ft�lbf (75 Nm) at 2900 rpm * 1975–1980 Mini, 45 hp (34 kW) at 5250 rpm and 56 ft�lbf (76 Nm) at 2700 rpm * 1979–1980 Mini, 45 hp (34 kW) at 5250 rpm and 56 ft�lbf (76 Nm) at 2700 rpm ==1071== The 1071 cc version was another one-off, this time for the Mini. It used a new 70.6 mm bore size and the 68.26 mm stroke from the #848. It was only produced in 1963 and 1964. Applications: * 1963–1964 Mini, 70 hp (52 kW) at 6000 rpm and 62 ft�lbf (84 Nm) at 4500 rpm ==970== The Mini next moved on to a 970 cc version. It had the same 70.6 mm bore as the #1071 Cooper S but used a shorter 61.91 mm stroke. It was produced from 1964 through 1967. Applications: * 1964–1967 Mini, 65 hp (48 kW) at 6500 rpm and 55 ft�lbf (75 Nm) at 3500 rpm ==1275== The largest A-Series engine displaced 1.3 L (1275 cc). It used the 70.6 mm bore from the Mini versions but the 81.28 mm stroke from the plain Mini Cooper. It was produced from 1964 through 1980 when it was replaced by an #1275 A+. Applications: * 1964–1971 Mini, 76 hp (57 kW) at 5800 rpm and 79 ft�lbf (107 Nm) at 3000 rpm * 1966–1970 Austin-Healey Sprite, 65 hp (48 kW) at 6000 rpm and 72 ft�lbf (98 Nm) at 3000 rpm * 1966–1974 MG Midget, 65 hp (48 kW) at 6000 rpm and 72 ft�lbf (98 Nm) at 3000 rpm * 1967–1968 MG 1300/Wolseley 1300, 58 hp (43 kW) at 5250 rpm and 69 ft�lbf (94 Nm) at 3000 rpm * 1967–1968 Riley Kestrel, 58 hp (43 kW) at 5250 rpm and 69 ft�lbf (94 Nm) at 3000 rpm * 1967–1968 Vanden Plas Princess, 58 hp (43 kW) at 5250 rpm and 69 ft�lbf (94 Nm) at 3000 rpm * 1967–1973 Morris 1300, 58 hp (43 kW) at 5250 rpm and 69 ft�lbf (94 Nm) at 3000 rpm * 1967–1974 Austin 1300, 58 hp (43 kW) at 5250 rpm and 69 ft�lbf (94 Nm) at 3000 rpm * 1967 MG 1275/Riley 1275, 58 hp (43 kW) at 5250 rpm and 69 ft�lbf (94 Nm) at 3500 rpm * 1967 Wolseley 1275, 58 hp (43 kW) at 5250 rpm and 69 ft�lbf (94 Nm) at 3500 rpm * 1967 Vanden Plas Princess, 58 hp (43 kW) at 5250 rpm and 69 ft�lbf (94 Nm) at 3500 rpm * 1968–1969 Riley Kestrel/Riley 1300, 70 hp (52 kW) at 6000 rpm and 77 ft�lbf (104 Nm) at 3000 rpm * 1968–1971 Austin America, 60 hp (45 kW) at 5250 rpm and 69 ft�lbf (94 Nm) at 2500 rpm * 1968–1973 Wolseley 1300, 65 hp (48 kW) at 5750 rpm and 71 ft�lbf (96 Nm) at 3000 rpm * 1968–1973 MG 1300, 70 hp (52 kW) at 6000 rpm and 77 ft�lbf (104 Nm) at 3000 rpm * 1968–1974 Vanden Plas Princess, 65 hp (48 kW) at 5750 rpm and 71 ft�lbf (96 Nm) at 3000 rpm * 1968 MG 1300/Riley Kestrel, 65 hp (48 kW) at 5750 rpm and 71 ft�lbf (96 Nm) at 3000 rpm * 1969–1971 Morris 1300, 70 hp (52 kW) at 6000 rpm and 74 ft�lbf (100 Nm) at 3250 rpm * 1969–1974 Mini, 59 hp (44 kW) at 5300 rpm and 65 ft�lbf (88 Nm) at 2550 rpm * 1969–1974 Austin 1300, 70 hp (52 kW) at 6000 rpm and 74 ft�lbf (100 Nm) at 3250 rpm * 1971–1980 Morris Marina, 60 hp (45 kW) at 5250 rpm and 69 ft�lbf (94 Nm) at 2500 rpm * 1971 Austin Sprite, 65 hp (48 kW) at 6000 rpm and 72 ft�lbf (98 Nm) at 3000 rpm * 1973–1980 Austin Allegro, 59 hp (44 kW) at 5300 rpm and 69 ft�lbf (94 Nm) at 3000 rpm * 1974–1980 Mini, 54 hp (40 kW) at 5300 rpm and 65 ft�lbf (88 Nm) at 2550 rpm ==A-Plus versions== British Leyland was keen to update the old A-Series design in the 1970s. However, attempts at replacement, including an aborted early-70s BMC K-Series engine and an OHC version of the A-Series, ended in failure. The little A-Series just worked too well. So the "A-Plus" was born. By tweaking the engine, BL engineers were able to extract more power without affecting torque. Some engine components were also replaced with more-reliable designs. ===998 Plus=== The A-Plus version of the 998 cc motor was produced from 1980 through 1992. Applications: * 1980–1982 Mini, 39 hp (29 kW) at 4750 rpm and 52 ft�lbf (71 Nm) at 2000 rpm * 1980–1982 Austin Allegro, 44 hp (33 kW) at 5250 rpm and 52 ft�lbf (71 Nm) at 3000 rpm * 1980–1990 Austin Metro, 41 hp (31 kW) at 5400 rpm and 51 ft�lbf (69 Nm) at 2700 rpm * 1982–1988 Mini, 40 hp (30 kW) at 5000 rpm and 50 ft�lbf (68 Nm) at 2500 rpm * 1988–1992 Mini, 42 hp (31 kW) at 5250 rpm and 58 ft�lbf (79 Nm) at 2600 rpm ===1275 Plus=== The big 1.3 L (1275 cc) engine was also given the "A-Plus" treatment. This lasted from 1980 through 2000, making it the last of the A-Series line. Applications: * 1980–1982 Austin Allegro, 62 hp (46 kW) at 5600 rpm and 72 ft�lbf (98 Nm) at 3200 rpm * 1980–1984 Morris Ital, 61 hp (46 kW) at 5300 rpm and 69 ft�lbf (94 Nm) at 2950 rpm * 1980–1990 Austin Metro, 63 hp (47 kW) at 5650 rpm and 72 ft�lbf (98 Nm) at 3100 rpm * 1982–1989 MG Metro, 72 hp (54 kW) at 6000 rpm and 73 ft�lbf (99 Nm) at 4000 rpm * 1983–1985 Austin Maestro, 64 hp (48 kW) at 5500 rpm and 73 ft�lbf (99 Nm) at 3500 rpm * 1983–1993 Austin Maestro, 68 hp (51 kW) at 5800 rpm and 75 ft�lbf (102 Nm) at 3500 rpm * 1984–1989 Austin Montego, 68 hp (51 kW) at 5600 rpm and 75 ft�lbf (102 Nm) at 3500 rpm * 1989–1990 MG Metro, 73 hp (54 kW) at 6000 rpm and 73 ft�lbf (99 Nm) at 4000 rpm * 1990–1991 Mini, 61 hp (46 kW) at 5550 rpm and 61 ft�lbf (83 Nm) at 3000 rpm * 1990–1991 Mini, 78 hp (58 kW) at 6000 rpm and 78 ft�lbf (106 Nm) at 3250 rpm * 1991–1996 Mini, 63 hp (47 kW) at 5700 rpm and 70 ft�lbf (95 Nm) at 3900 rpm * 1991–2000 Mini, 77 hp (57 kW) at 5800 rpm and 80 ft�lbf (108 Nm) at 3000 rpm * 1992–2000 Mini, 50 hp (37 kW) at 5000 rpm and 66 ft�lbf (89 Nm) at 2600 rpm ===1275 Turbo=== The 1.3 L (1275 cc) engine was turbocharged, producing the highest-output A-Series variant at 96 hp (72 kW) in the 1989 Mini. Turbo versions lasted from 1983 through 1990. Applications: * 1983–1989 MG Metro, 93 hp (69 kW) at 6130 rpm and 85 ft�lbf (115 Nm) at 2650 rpm * 1989–1990 Mini, 96 hp (72 kW) at 6130 rpm ===1275 TPi=== A special "twin-port injection" version of the 1.3 L (1275 cc) engine was developed by Rover engineer, Mike Theaker. It was the last A-Series variant, produced from 1997 through 2000. Applications * 1997–2000 Mini, 63 hp (47 kW) at 5500 rpm and 70 ft�lbf (95 Nm) at 3000 rpm ==References== * BMC engines

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