B.M.C, M.G, & Morris Engine Codes.
This list cover the 1936 Morris engines, and the 1952 to 1990 BMC/BMH/BL/Austin Rover 'A', 'B', and 'C' series engines you will find in the companies cars. It is intended to help identification of an engine. 1936 to 1956. Consists of four letters, followed by the engines number. (1)MODEL U M X T Q O A (2)Valves (3)Bore & H.P. H 57mm 8HP J 63.5mm 10HP A 66.5mm 11HP B 69.5mm 12HP E 72mm 13HP D 75mm 14HP D 61.5mm 6cyl H 69mm 6cyl (4)Make. M G W C Morris M.G. Wolseley Commercial
Morris 8 S Sidevalve Morris 10/4 P OHV late Morris 10/4 C OHC Morris 12/4 2ltr 6 cyl 3 1/2 ltr 6cyl Austin A30
ie; XPAG XPJM XPJW USHM XPEG MPJG MPJM MPJW APHM APJM TPBG TPDG QPJG QPHW
1250cc MG TB OHV engine 11HP. 1140cc Morris 10/4 ohv engine 10HP. 1140cc Wolseley 10/40 ohv engine 10HP. 918cc Morris Minor MM SV engine 8HP. 1488cc MG TF OHV engine 13HP. 1292cc MG TA engine ohv 12HP. 1292cc Morris 12/4 OHV engine 10HP. 1292cc Wolseley 12/48 OHV engine 10HP. 803cc Morris Minor MM OHV engine, 8HP. ( first 'A' series.) 948cc Morris Minor 1000 OHV engine 10HP. 1549cc MG VA ohv engine 12HP. 1705cc MG 'Cream Cracker' TA engine. 2322cc MG WA ohv engine 18HP. 2561cc Wolseley 18/80 ohv engine 18HP.
BMC 'B' Series, 1947 to 1981.( First real 'B' series was in 1953.) With the arrival of Austin based 'A' & 'B' series amongst those used, a system of engine 'cc' was added. It basically followed the post 1956 system, but put 'BP' infront to denote 'B' series, 'P'ush rod ohv.The first car to use the 'B' series was the M.G. Magnette ZA, in 1489cc form, in 1953. The earlier Austin A40 Devon 1200cc unit was that developed into this later 1489cc and 1200cc 'B'. ie. BP15M was a 1489cc Morris Oxford. BP15GA was the ZA Magnette of 1489cc. BP15GC an improved ZA Magnette, with full flow oil filter. BP15GB was the first MGA 1489cc engine, BP 15GD followed it.
BC16GB was the MGA Twin Cam, 'B' series, 'C' camshaft. 1956 to 1970 'A', 'B', and 'C' Series engine Prefix. The 'BP' prefix was dropped once BMC had its three engine types, A, B, and C. Again, there is a prefix, consisting of a number, then letter/letter/letter, then the engine number. Cubic capacity 8 803cc 9 948cc 10 1098cc 12 1200cc 12 1275cc 15 1489cc 16 1588cc 16 1622cc 18 1798cc 22 2200cc 25 2500cc 26 2600cc 29 2912cc Make Type Ancillaries Compression
B BMC Industrial A to Z A automatic H high comp G M.G. ,, M manumatic clutch L low comp A Austin ,, P police spec. W Wolseley ,, U central gear change H miscellaneous ,, N column change J Commercial ,, O overdrive V Van den Plas ,, M Morris ,, R Riley ,,
ie, 15W / U / H 1234 1489cc Wolseley 15/50, central gear change, high comp. 15GE / U / H 1234 1489cc M.G. Magnette Mk3, central gearchange, high comp. 16AMW / U / H 1234 1622cc Austin, Morris & Wolseley Farina, central gear, high c. 16GA / U / H 1234 1588cc MGA 1600,central gear change, high comp. 15AC / N / L 1234 1489cc Austin 15cwt van, column change, low comp. 18GA / O / H 1234 1798cc MGB 3 main B. with overdrive, high comp. 29WA / O / H 1234 2912cc Wolseley 6/110, overdrive, high comp. 29GA / A / H 1234 2912cc MGC GT, automatic, high comp. 1970 onwards. After 1970 the system was again changed, and simple types were just numbered. 85 848cc 16 1622cc 99 998cc 18 1798cc 10 1098cc 22 2200cc 12 1275cc
with either a 'V' or an 'H' after it. 16V meant vertical,( in-line), as in the Sherpa van, or 18V as in both the later Sherpa and MGB, and Morris Marina 1800. 12V would be in an Ital, and 12H in Metro, H meaning horizontal, (FWD.) It was the group of numbers/letters after that denoted the fitment, ie, 18V-584F for a UK specification engine on the MGB. 18H was in the FWD 1800. As an aside, the big BMC 6 cylinder 'C' series was a Morris Engines design, where as the 'A' & 'B' were Austin designed. ************
BMC 'B' SERIES ENGINES USE.( 1953 to 1981.)

Prefix

BHP/RPM
Torque 58lb/ft 65 (LC) 85 87
Austin A40 Devon 1200 BP12M 40/4500 Austin A40 Somerset 1200 BP12M 42/4500 Austin A40 Sports 1200 BP12M 42/4500 Austin A40 Sports 1200 BP12M 46/4500 Austin A40 Cambridge 1200 BP12M 42/4500 Morris Cowely series BP12M 40/4500 Austin Metropolitan BP12M 42/4500 Austin Metropolitan BP15M 52/4500 Nash Metrpolitan 15F ( USA only) 52/4500 Massey Harris combined harvester 1200 1HLC 40/4500 Morris Oxford series BP15MH 50/4500 Morris Oxford series BP15ML 45/4500 Morris Cowely series BP15M 50/4500 Morris Oxford series 15M 55/4500 Morris Oxford series 15M 55/4500 Wolseley 15/BP15W 50/4500 Wolseley 15/15AMW 55/4500 Wolseley 1500 MkBP15LAW 50/4500 Wolseley 1500 Mk15W, 15WA 55/4500 Riley 1.5 Mk15R, 15RA 60/4800 Riley 1.5 Mk15RB 66/5200 M.G. Magnette ZA 1489 BP15GA 60/4800 M.G. Magnette ZA & ZB 1489 BP15GC,15GC 68/5200 M.G. MGA 1489 BP15GB,15GB 68/5200 M.G. MGA 1489 15GD 72/5500 M.G. MGA 16GA 80/5600 MGA Twin Cam 1588 BC16GB 108/6700 Austin/Morris 1/2ton, ) 1489 BP15ML, ) van,pick up, ) 15AC, VS15C ) 50/4200 Diesel Engine 1489 BP15J,15Y,15J,15Z 40/4200 Austin A50 Cambridge 1489 1H 50/4500 Austin A55 Cambridge 55/4500 Austin A55 Mk2 Camb. 1489 15AMW 55/4500 Morris Oxford series 15AMW 55/4500 Wolseley 15/15AMW 55/4500 Riley 4/15RA, 15RB, 68/5200 M.G. Magnette Mk15GE 66/5200 Morris Oxford series 16AMW, 16AA 61/4500 Austin A60 Cambridge 1622 16AMW, 16AA 61/4500 Wolseley 16/16AMW,16AA 61/4500 M.G. Magnette Mk16GE, 16GF 68/5200 Riley 4/16RA,16GF 72/5500 M.G. MGA 1600 Mk16GC 90/5500

74 (LC) 90 97

A60 commercials 1622 Farinas with alternators, 1622 BMC 1/2 ton van 1622 Sherpa van 1622 Sherpa van 1798 Morris Marina Morris Marina 1800TC 1798 Austin 1800 MkMorris 1800 MkWolseley 18/all 1800 Mkall 1800 MkAustin 1800S 1798 M.G. MGB (3 mainbearings) 1798 M.G. MGB* (5 mainbearings) 1798
Hundustani Navigator Marine Navigator Marine
16AC,16AE 61/16C (1971 only) 61/16AD 61/16V 58/(LC) 18V 80/(LC) 18V 85/18V 95/18C,18AMW 80/18C,18AMW 80/18C,18AMW 80/18C 86/18H 86/18H 96/18G,18GA 95/18GB,18GD,18GG, 18GH,18GF,18GJ, 18GK, & 18V 95/(power down to 84bhp by 1975 for USA.) 1489 ? 50/1489 ? 42/1622 ? 58/4500 85
Differing compresion ratios gave different BHP/Torque figures. (LC) indicates low comp, usually about 7.2 to 1, the normal, or high comp, was usually 8.3 to 1. Later cars such as the MGA & MGB ran with 9 to 1 and 9.5 to 1, as did some 1800 fwd cars. An 'H' or 'L' in the number is usually a clue to the ratio, though a simple change of pistons will change the ratio if the 'dish' differs in the crown. 48G is a 'B' series Gold Seal recon unit. The 'A' series was 8G, and the 'C' series 68G. ( ** All pre-1956 reconditioned engines were prefixed 8G, only when the Gold Seal Exchange engine arrived, was there any difference.) The MGB used the 1800 for a long time, so there were codes to denote the differences between the engines, peculiar to MG;prefix 18G 18GA 18GB 18GD 18GF 18GG 18GH * 18GJ 18GK 18V** bearings model Mk1 GHN3/D3 Mk1 GHN3/D3 Mk1 GHN3/D3 Mk2 GHN4/D4 Mk2 GHN4/D4 Mk2 GHN5/D5 Mk2 GHN5/D5 Mk2 GHN5/D5 Mk2 GHN5/D5 Mk3 GHN5/D5 market all all all UK/Europe USA UK/Europe Europe USA USA see below dates if known Oct 1962/April64 April 1964/Oct64 Oct1964/67 Oct1967/69 Oct1967/69 Oct1969/71 Oct1969/70 Oct1969/70 Oct1970/71 Oct 1971 onwards.
* After 18GH there were extra letters after the prefix, 'U' still meant central gearchange; 'RU' now meant overdrive; 'We' all synchromesh gearbox; 'RWe' all synchro with overdrive; 'Rc' automatic gearbox.
** 18V was followed with a code for the market, such as if a 'Y' appears in the prefix, it is a Europe spec car; if a 'F' a UK spec car; if a 'Z' a north America spec car. An 'AE' after 1975 is a car with a catylist fitted for California. The emmission controls, timing changes, etc, require a workshop manual to identify the huge numbers of changes.

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BMC 'A' Series Engines. ( 1952 to 1999)
Just like the 'B' series, BMC used the same system as above to denote the use of the engine. Car Model Engine cc Prefix number.
Austin A30 803cc 2A Austin A35 948cc 9A Austin A35 van ( optional) 848cc 8G ( post 1962 all GPO.) Austin A40 Mk1 948cc 9A or 9D Austin A40 Mk2 948cc 9DB Austin A40 Mk1098cc 10D or 10DD Austin Healey Sprite Mk1 948cc 9CG or 9CC Sprite Mk2/ MG Midget Mk1 1098cc 10CG Sprite Mk3/ MG Midget Mk2 1098cc 10CC ( 2" main bearings.) Sprite Mk4/ MG Midget Mk3 1275cc 12CC or 12CE home market. 12CD or 12CJ N. America. after Oct '72, 12V/586F/H home market.. 12V/671Z/L N. America Austin Allegro 1275cc 12H/A ( same as Metro) Austin Mini 848cc 8A Morris Mini 848cc 8MB Austin & Morris Mini after 1962, 848cc 8AM Austin/Morris Mini automatic 848cc 8AH Mini Automatic closed circuit breather 848cc 8AK Mini floor change closed circuit breather 848cc 8AJ Mini GPO saloon & van 848cc 85H ( 1" restrictor in carb.) Mini Clubman 1098cc 10H Mini 1000 998cc 99H Mini 1000 unleaded high comp 998cc 99HE20 Mini 1000 unleaded low comp 998cc 99HE22 Mini 1000 Automatic 998cc 99HB82P Mini 1275cc 1275cc 12H Mini Moke 848cc 8AC 1275GT & Cooper Mk3 'S' 1275cc 12H Later Cooper models 1275cc 12A Wolseley Hornet, Riley Elf Mk1 848cc 8WR Wolseley Hornet, Riley Elf Mk2 998cc 9WR

Austin, Morris, Wolseley fwd 1100 1098cc 10AMW, 10H.. 1098cc closed circuit breather 10AH Austin, Morris, Wolseley 1100 Automatic 1098cc 10AG.. 1098cc closed circuit breather, 10AJ MG 1100 Mk1 & Mk2, Riley 1100 1098cc 10GR MG & Riley 1100 closed circuit breathing 1098cc 1965 on 10GRB Vanden Plas 1100 1098cc 10GR, 10V MG 1300 Mk1 1275cc 12G ( single SU.) MG 1300 Mk2 , Riley 1300 1275cc after April '68 12GR All fwd 1300 Automatic 1275cc 12A Vanden Plas 1300 1275cc 12GR, 12V Austin 1300 'S' Mk1, Mk2 1275cc 12FA Austin 1300 'S' Mk3 1275cc 12H Austin Maestro/Montego 1.3 1275cc 12HA ( 'A' Plus) ( Uses Marina 1.3 type block.) Austin Metro 1 ltr 998cc 99HA ( all 'A' Plus) Metro 1 ltr1985 on 998cc 99HA, 99HB, 99HC, 99HD, 99HE, 99F. Metro 1300 HLE 1275cc 12HA08AA. 1275cc 12HB, 12HC, 12HD, 12HE, 12HF. MG Metro 1300 leaded fuel pre 1989 1275cc 12H996AA, 12HD24 MG Metro 1300 unleaded post mid-1989 1275cc 12HF01 MG Metro Turbo leaded fuel pre 1989 1275cc 12HD26 MG Metro Turbo unleaded 1275cc 12HF01 Austin Metro Sport. 1275cc 12HF02 Austin Metro GTa. 1275cc 12HF02 Austin Metro's with unleaded engines, 1275cc 12HE24, 35, 39, 40, 41, 42, 67 up to 75. Morris Minor Series 2 Morris Minor 1000 series 3 Morris Minor 1000 series 4 after 1956 Morris Minor 1000 series 5 Morris Minor series 5, close circuit breather Morris 1000 GPO van Morris 1000 van, low compression Morris 1000 van closed circuit breather Morris Marina 1300 Specialist engines. Mini Cooper Mini Cooper Mini Cooper Mini Cooper Mini Cooper Mini Cooper Mini Cooper Mini Cooper 997cc & 1070cc 'S' 997cc 970cc 'S' 1275cc 'S' 998cc 998cc 970cc 'S' 998cc 9F/SA/H comp 9.1 9F/SA/L 8.3 9F/SA/X 10 9F/SA/Y 9.75 9FA/SA/H 9.1 9FA/SA/L 8.3 9FC/SA/H 9.1 9FD/SA/H 9.1 803cc 948cc 948cc 1098cc 1098cc 948cc 1098cc 1098cc 1275cc APHM APJM 9M 10MA 10ME 8AG after 1962 10AB 10V 12V
Mini Cooper Mini Cooper Mini Cooper Mini Cooper Mini Cooper Mini Cooper Mini Cooper
1070cc 'S' 998cc 970cc 'S' 1275cc 'S' 970cc 'S' 1275cc 'S' 1070cc 'S'
9FD/SA/H 9.1 (engine 33661 to 33948,) 9FD/SA/L 8.3 9FD/SA/X 10 9FD/SA/Y 9.75 9FE/SA/X 10 9FE/SA/Y 9.75 10F 8.3
Still being fitted to the 1275cc Mini as 12HE.( 1999) Neil Cairns, MG Engine Information Service < neil.cairns@virgin.net >

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BMC 'C' SERIES Engines.
( Not a complete list yet.) 1954 Morris Isis, 2693cc C26M 1954 Wolseley 6/90 2693cc 26W 1954 Austin A90 Zenith carb 2693cc 26A 1956 Riley 2.6 2693cc 26R 1956 Austin A105 2693cc 26A 1956 Austin Vanden Plas A105 2693cc 26A 1956 Austin A95 Westminster 2693cc 26A 1956 Austin Healey 100/6 2693cc 26A 1959 Austin Healey 3000 Mk1 2912cc 29A 1961 Austin Healey 3000 Mk2 2912cc 29A 1963 Austin Healey 3000 Mk3 2912cc 29A 1959 Austin Westminister A99 2912cc 29A 1959 Wolseley 6/99 2912cc 29WA 1959 Vanden Plas Princess Mk1 2912cc 29VA 1961 Austin Westminister A110 Mk1 & Mk2 2912cc 29A 1961 Wolseley 6/110 Mk1 & Mk2 2912cc 29WB 1961 Vanden Plas Princess Mk2 2912cc 29VB 1967 Austin 3 Litre ( 7 main bearings,) 2912cc 29AA 1967 MG MGC ( ,, ,, ) 2912cc 29GA 85bhp 124 145

The Austin models used Zenith carbs up to the farina Westminster in 1959, then they had SU's as all the others used all along. Healeys had different cylinderheads, separate manifolding, and camshafts. ****************** GOLD SEAL EXCHANGE ENGINES. BMC like many firms did an exchange scheme for worn engines, one was the Gold Seal engine, a complete engine ready to fit and painted gold in colour. The other was
the Silver Seal exchange engine, basically a short-block for the owner/garage to fit the old head,sump, and ancillories onto. Both used a similar system of engine numbering, the original number being struck off. Initially all engines in the scheme were prefixed 8G, soon a better system followed:'A' series engines were prefixed 8G,- 803cc, 848cc, 948cc, 1098cc, 1275cc. 'B' series were prefixed 84G,- 1200cc, 1489cc, 1588cc, 1622cc, 1798cc. 'C' series were prefixed 86G,- 2693cc, 2912cc. The code after was to do with rebore/regrind sizes and a job number. *******************