Keeping Minis Driving
Engine Code Decoder
Unsure what your engine plate looks like?
850cc 970cc 997cc 998cc 1070cc 1100 1275
Engine Codes
| Code | Engine Size | Engine Variant | Gearbox Details | Details | |
|---|---|---|---|---|---|
| 8A | 850 | Austin up to 25000 | |||
| 8MB | 850 | Morris up to 25000 | |||
| 8AM | 850 | Austin & Morris 25000-onward | |||
| 8AH | 850 | Austin & Morris Automatic | |||
| 8AJ | 850 | Austin | Closed-circuit breathing | ||
| 8AK | 850 | Austin & Morris automatic | Closed-circuit breathing | ||
| 8WR | 850 | Wolseley Hornet & Riley Elf | |||
| 8AC | 850 | Moke | |||
| 85H/101 | 850 | All variants 1969-onwards | |||
| 9WR | 998 | Wolseley Hornet & Riley Elf Mk2 | Pre- closed circuit breathing | ||
| 9AD | 998 | Austin, Wolseley Hornet & Riley Elf Mk2 | Remote type gearbox | Closed circuit breathing | |
| 9AE | 998 | Wolseley Hornet & Riley Elf Mk3 | |||
| 99H/-/101-on | 998 | Wolseley, Riley, Mini 1000, Clubman1000 1970-onward and Mk3 | Dished pistons | ||
| 99H/791 | 998 | Mini 1974-onward | Dished piston | ||
| 99H/997 | 998 | 1980-onward A+ block | 2.95 final drive | Flat top pistons | |
| 99H/A97P | 998 | A+ block | Pre-A+ gears, 3.44 final drive | Dished pistons, 12-inch wheels | |
| 99H/B81 | 998 | Up to engine number 127431 | Flat top piston with circlip wrist pin retention | ||
| 99H/C20 | 998 | Up to engine number 105023 | Flat top piston with circlip wrist pin retention | ||
| 99H/997 | 998 | From engine number 127422 | 2.95 final drive | Flat top piston with circlip wrist pin retention | |
| 99H/A35P | 998 | Flat top piston with circlip wrist pin retention | |||
| 99H/B81 | 998 | From engine number 127432 | Flat top piston with press fit wrist pin | ||
| 99H/C20 | 998 | From engine number 105024 | Flat top piston with press fit wrist pin | ||
| 99H/D80 | 998 | Flat top piston with press fit wrist pin | |||
| 99H/G30 or G32 or G33 | 998 | Flat top pistons with press fit wrist pins, lead-free cylinder head | |||
| 99H/F15 or F16 | 998 | Flat top pistons with press fit wrist pins, lead-free cylinder head | |||
| 99H/E20 or E21 | 998 | Flat top pistons with press fit wrist pins, lead-free cylinder head | |||
| 99H/D81 | 998 | Flat top pistons with press fit wrist pins, lead-free cylinder head | |||
| LBB10089 | 998 | Flat top pistons with press fit wrist pins, lead-free cylinder head | |||
| 99H/B83P | 998 | Up to engine number 102908 | Dished pistons with circlip wrist pin retention | ||
| 99H/B84P | 998 | Up to engine number 100216 | Dished pistons with circlip wrist pin retention | ||
| 99H/B83P | 998 | From engine number 102909 | Dished pistons with press fit wrist pin, lead-free | ||
| 99H/B84P | 998 | From engine number 100217 | Dished pistons with press fit wrist pin, lead-free | ||
| 99H/G31 | 998 | ||||
| 99H/E22 | 998 | ||||
| LBB10175 | 998 | ||||
| 10AMW/Ta | 1100 | Clubman Estate and Austin 110 (ADO16 shape) | |||
| 10H791 | 1100 | Clubman Saloon (sedan) | |||
| 10H/-/H | 1100 | All Austin 1100 2- and 4-door derivative Saloons (ADO16 shape) | |||
| 10GR/Ta/H | 1100 | MG1100 (ADO16 shape) | |||
| 10GRB/Ta/H | 1100 | MG1100 & Wolseley 1100 (ADO16) | |||
| 10V/Ta/H | 1100 | Vanden Plas 1100 (ADO16 shape) | |||
| 9F/Sa/H101 to 2637 except 19201 to 20410 (became 1070S) | 997 | ||||
| 9FA/Sa/H | 998 | Cooper | Mk1 Austin pre-closed circuit breathing | ||
| 9FD/Sa/H | 998 | Cooper | Mk1 Morris up to engine number 1934, all Austin Mk2 closed circuit breathing and Morris Mk2 from engine number 1935-33660 with closed circuit breathing | ||
| 9FD/Xe/H | 998 | Cooper | 4-synchro gearbox | 4-synchro gearbox introduced | |
| 99/-/H | 998 | Cooper | Last of manufacture 1969 | ||
| 9F/Sa/X | 970 | Cooper S | Engine numbers 29001-29003 with Tecalamit filter | ||
| 9FD/Sa/X | 970 | Cooper S | Closed circuit breathing introduced with Tecalamit filter | ||
| 9FE/Sa/X | 970 | Cooper S | Closed circuit breathing, oil filter with oil light switch introduced | ||
| 9F/Sa/X | 970 | Cooper S | Engine numbers 29039-30029 Purolator oil filter with oil light switch and closed circuit breathing | ||
| 9F/Sa/H | 1070 | Cooper S | Engine numbers 26501 to 33660 and 19201 to 20410 | ||
| 9FD/Sa/H | 1070 | Cooper S | Engine numbers 33661 to 33948 with closed circuit breathing and oil light switch in oil filter head | ||
| 9F/Sa/Y | 1275 | Cooper S | Engine numbers 31001 to 31504 pre closed circuit breathing with Purolator oil filter | ||
| 9FD/Sa/Y | 1275 | Cooper S | Closed circuit breathing with oil light switch on filter housing after engine number 32178 | ||
| 9FE/Sa/Y | 1275 | Cooper S | Closed circuit breathing with oil light switch on Purolator filter housing and piston design change | ||
| 9F/Sa/Y | 1275 | Cooper S | From engine number 32378 onward, closed circuit breathing with Purolator filter with oil light switch, Aeg510 camshaft introduced at engine number 40006, cross-drilled EN40Bcrank at engine number 42730 and metal dipstick tube at engine number 42548-onward | ||
| 12H397 | 1275 | Cooper S | Cooper S Mk3 with dynamo, negative earth and Tuiftrided EN16T crankshaft | ||
| 12H398 | 1275 | Cooper S | Cooper S Mk3 with alternator, negative earth and Tuftrided EN16T crankshaft | ||
| 12G/Ta/H | 1275 | Solid Wall Block (No Tappet Covers) | ADO17 shape Wolseley, Riley, MG & Vanden Plas fitted with S rods | ||
| 12H379 | 1275 | Solid Wall Block (No Tappet Covers) | Remote type gearbox | 1275GT with dynamo, negative earth, electric fuel pump | |
| 12H380 | 1275 | Solid Wall Block (No Tappet Covers) | Remote type gearbox | 1275GT with alternator, negative earth, electric fuel pump | |
| 12H389 | 1275 | Solid Wall Block (No Tappet Covers) | Remote type gearbox | 1275GT with dynamo, negative earth, mechanical fuel pump | |
| 12H390 | 1275 | Solid Wall Block (No Tappet Covers) | Remote type gearbox | 1275GT with alternator, negative earth, mechanical fuel pump | |
| 12H706 | 1275 | Solid Wall Block (No Tappet Covers) | Rod change gearbox | 1275GT with alternator, negative earth, mechanical fuel pump | |
| 12H397 | 1275 | Cooper S Mk3 - Solid Wall Block (No Tappet Covers) | Dynamo and negative earth | ||
| 12H398 | 1275 | Cooper S Mk3 - Solid Wall Block (No Tappet Covers) | Alternator and negative earth | ||
| 12H/-/ | 1275 | Solid Wall Block (No Tappet Covers) | 1275 Austin ADO16 & Allegro | ||
| 12H610/635 | 1275 | Solid Wall Block (No Tappet Covers) | Innocenti Mini with duplex cam drive gears and 11-stud head | ||
| 12H719/832 | 1275 | Solid Wall Block (No Tappet Covers) | Innocenti Mini with simplex cam drive gears and 11-stud head | ||
| 12A/2A | 1275 | 1990-onwards | Carburetor type | ||
| 12A/2B | 1275 | 1990-onwards | Carburrettor and catalyst type | ||
| 12A/2D | 1275 | 1990-onwards | SPi (Single-Point Injection // TBI = Throttle-Body Injection) with 9.4-1 CR | ||
| 12A/E | 1275 | 1990-onwards | SPi (TBi - throttle body injection) with 10-1 CR | ||
| F75 | 1275 | 1990-onwards | 3.105 final drive | 9.4-1CR, SPi, closed loop catalyst | |
| F76 | 1275 | 1990-onwards | 9.4-1CR, automatic with closed loop catalyst | ||
| F77 | 1275 | 1990-onwards | 3.2 final drive | 10.0-1CR, SPi Cooper, closed loop catalyst | |
| G01 | 1275 | 1990-onwards | 3.105 final drive | 10.0-1CR, catalyst, no oil cooler | |
| G03 | 1275 | 1990-onwards | 3.105 final drive | 9.4-1CR, catalyst, May 1992 onward | |
| G04 | 1275 | 1990-onwards | 2.76 final drive | 9.4CR, catalyst, French only spec | |
| G05 | 1275 | 1990-onwards | 9.4-1CR, automatic with catalyst | ||
| 8G28 | 850 | Factory Replacement Engines | Oil feed to primary gear type crank with 1.375" tail shaft | ||
| 8G35 | 850 | Factory Replacement Engines | Deva bush conversion type crankshaft with 1.375" tail shaft | ||
| 8G45 | 850 | Factory Replacement Engines | Gold Seal, 1.5" self-oiling primary gear/crankshaft type | ||
| GSE1101E | 850 | Factory Replacement Engines | Gold Seal unit | ||
| RKM1101E | 850 | Factory Replacement Engines | Silver Seal unit | ||
| BHM1307E | 850 | Factory Replacement Engines | Gold Seal unit, 85H prefix replacement | ||
| 8G18 | 997 | Factory Replacement Engines | Cooper - Oil feed to primary gear type crankshaft | ||
| 8G29 | 997 | Factory Replacement Engines | Cooper - Deva bush type primary gear and crankshaft | ||
| 8G36 | 997 | Factory Replacement Engines | Cooper - Oil feed converted primary gear and crankshaft | ||
| 8G33 | 998 | Factory Replacement Engines | Cooper - Fitted with 28G193 (12G202) cylinder head | ||
| 8G40 | 998 | Factory Replacement Engines | Cooper - 28G222 (12G295) cylinder head introduced | ||
| 8G42 | 998 | Factory Replacement Engines | Cooper - Closed circuit breathing rocker cover and side plates | ||
| 8G49 | 998 | Factory Replacement Engines | Cooper - Purolator oil filter with oil light switch introduced | ||
| GSE1103E | 998 | Factory Replacement Engines | Cooper - Gold Seal unit, was RKM1120E Silver Seal | ||
| RKM1103E | 998 | Factory Replacement Engines | Cooper - Silver Seal unit | ||
| 8G57 | 998 | Factory Replacement Engines | New from 1969 and exchange for all pre-A+ up to 1981 | ||
| GSE1102E | 998 | Factory Replacement Engines | old Seal unit, was RKM1119E Silver Seal unit, pre-A+ up to 1981 | ||
| RKM1102E | 998 | Factory Replacement Engines | Silver Seal unit, pre-A+ up to 1981 | ||
| RKM1119E | 998 | Factory Replacement Engines | Silver Seal unit, replaced by RKM1102E, pre-A+ up to 1981 | ||
| BHM1232 | 998 | Factory Replacement Engines | Low-compression dished piston, CAM6267 camshaft, early cylinder head and crankshaft main bearings with side locator tang, A+ | ||
| BHM1377 | 998 | Factory Replacement Engines | High-compression flat top piston, CAM4717 camshaft, early cylinder head and crankshaft main bearings with side locator tang, A+ | ||
| BHM1458 | 998 | Factory Replacement Engines | Low compression piston, CAM6267 camshaft, late A+ cylinder head and crankshaft main bearings with central locator tang, A+ | ||
| BHM1460 | 998 | Factory Replacement Engines | High-compression press-fit wrist pin piston, CAM4717 camshaft, late A+ cylinder head and crankshaft main bearings with central locator tang, A+ | ||
| LBB10089 | 998 | Factory Replacement Engines | Low compression press-fit wrist pin piston, CAM6267 camshaft, lead-free late A+ cylinder head and crankshaft main bearings with central locator tang, A+ | ||
| 8G156E | 1100 | Factory Replacement Engines | Clubman, Special and Austin 1100 (ADO16) | ||
| RKM1150E | 1100 | Factory Replacement Engines | Silver Seal unit for Clubman and Special | ||
| RKM1151E | 1100 | Factory Replacement Engines | Silver Seal unit for Clubman and Special | ||
| BHM1042 | 1100 | Factory Replacement Engines | New and Gold Seal units for Clubman and Special, 1974-1980 | ||
| BHM1229 | 1100 | Factory Replacement Engines | New and Gold Seal units for Clubman and Special, A+ Block, 1980-on | ||
| 8G38 | 970 | Factory Replacement Engines | Gold Seal unit, pre closed circuit breathing, Cooper S | ||
| 8G41 | 970 | Factory Replacement Engines | Gold Seal unit with closed circuit breathing sideplates, Cooper S | ||
| 8G46 | 970 | Factory Replacement Engines | Gold Seal unit withoil light switch in filter housing, Cooper S | ||
| 8G133 | 1070 | Factory Replacement Engines | Gold Seal unit, pre closed circuit breathing, Cooper S | ||
| 8G153 | 1070 | Factory Replacement Engines | Gold Seal unit with closed circuit breathing side plates, Cooper S | ||
| 8G145 | 1275 | Factory Replacement Engines | Pre closed circuit breathing unit, Cooper S | ||
| 8G154 | 1275 | Factory Replacement Engines | Closed circuit breathing side plates unit, Cooper S | ||
| 8G155 | 1275 | Factory Replacement Engines | Oil filter housing with oil pressure light switch, Cooper S | ||
| 8G174 | 1275 | Factory Replacement Engines | Fitted with AEG510 camshaft, Cooper S | ||
| 38G464 | 1275 | Factory Replacement Engines | Introduced in 1970, most of which were fitted with EN16 Tuftrided crankshaft | ||
| 8G200 | 1275 | Factory Replacement Engines | New and Gold Seal units Clubman 1275GT | ||
| 38G527 | 1275 | Factory Replacement Engines | New and Gold Seal units for engine numbers prefixed 12H706, 12H707 & 12H831 for Clubman 1275GT | ||
| RKM1130E | 1275 | Factory Replacement Engines | Silver seal unit, was RKM1112E, for Clubman 1275GT, pre-A+ | ||
| RKM1152E | 1275 | Factory Replacement Engines | Silver Seal unit for Clubman 1275GT, pre-A+ | ||
| RKM1112E | 1275 | Factory Replacement Engines | Silver Seal unit for Clubman 1275GT, pre-A+ | ||
| BHM1220 | 1275 | Factory Replacement Engines | A+ unit for Clubman 1275GT | ||
| 8G199E | 1275 | Factory Replacement Engines | Gold Seal unit with Duplex cam drive gears for 1300GT (ADO16) and Innocenti 1300, 11-stud cylinder head | ||
| 38G559E | 1275 | Factory Replacement Engines | Gold Seal unit with Simplex cam drive gears for engine numbers prefixed 12H719 and 12H832, for 1300GT (ADO16) and Innocenti 1300, 11-stud cylinder head | ||
| GSE1109E | 1275 | Factory Replacement Engines | Gold Seal unit for 1300GT (ADO16) and Innocenti 1300, 11-stud cylinder head | ||
| RKM1133E | 1275 | Factory Replacement Engines | Silver Seal unit for 1300GT (ADO16) and Innocenti 1300, 11-stud cylinder head | ||
| BHM1209E | 1275 | Factory Replacement Engines | Gold Seal unit, replaced all Innocenti 1300 engines from engine numbers prefixed 12H610, 12H635 and 12H832 |
Support
SUPPORT THE SITE
Classic Mini DIY is completely free resource supported by our viewers. If you are interested in helping to keep the channel alive, consider supporting on Patreon.
A one-time or recurring tip that helps keep the lights on — separate from Sustaining Membership.