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Technical Specifications

The following page contains a list of technical data that spans the whole of the production history of the marque from 1963 to 1977. All information has been gathered mostly from the excellent Service Notes Volume that are available from the club shop.

Engine

Type: 6 cylinder in line, OHV
Capacity:
2000: 1998 cm³
2500: 2498 cm³
Stroke:
2000: 76.0 mm
2500: 95.0 mm
Bore: 74.7 mm
Firing order: 1,5,3,6,2,4
Compression ratio:
2000 Mk1: 8.5:1 or 9.1:1
2000 Mk2 (69-73): 9.25:1
2000/2000TC Mk2 (73-77): 8.8:1
2·5PI Mk1/Mk2: 9.5:1
2500TC/S: 8.5:1
Power:
2000 Mk1: 90bhp(net) @5000rpm
2000 Mk2: 84bhp(DIN) @5000rpm
2000TC Mk2 (75-77): 91bhp(DIN) @4750rpm
2·5PI Mk1: 132bhp(net) @5500rpm
2500TC Mk2 (74-75): 99bhp(DIN) @4700rpm
2500TC/S Mk2 (75-77): 106bhp(DIN) @4700rpm
2·5PI Mk2: 124bhp(DIN) @5500rpm
Maximum torque:
2000 Mk1: 117lb.ft @2900rpm
2·5PI Mk1/Mk2: 153lb.ft @2000rpm
2000 Mk2: 100lb.ft @2900rpm
2000TC Mk2: 110lb.ft @3300rpm
2500TC Mk2 (74-75): 133lb.ft @3000rpm
2500TC/S Mk2 (75-77): 139lb.ft @3000rpm
Oil pressure: 40 to 60 psi @2000rpm
Oil capacity: 5.1 litres
Coolant capacity: 7.7 litres
Valve train
Inlet: Clearance: 0.254 mm (cold)
Material: En53
Head dia (MkI): 33.10 mm
Throat dia (MkI): 30.18 mm
Stem dia: 7.90 mm
Outlet: Clearance: 0.254 mm (cold)
Material: 21-4-NS
Head dia (MkI): 29.92 mm
Throat dia (MkI): 27.00 mm
Stem dia: 7.87 mm
Seats: Angle: 45 deg
Material: Cast iron BS 1452/14
Rocker: Ratio (MkI): 1.50:1
Spring: Material (MkI): En 49 D
Crash speed: 6600rpm
Rate/inner: 28.5 lb/in
Rate/outer: 150 lb/in
Free length/inner: 1.56″
Free length/outer: 1.61″
Inst. length/inner: 1.140″
Inst. length/outer: 1.386″
Coil dia./inner: 0.654
Coil dia./outer: 0.923″
Wire gauge/inner: 0.076″
Wire gauge/outer: 0.128″
Act. coils/inner: 6.0
Act. coils/outer: 3.25
Camshaft: Lift at valve (MkI): 0.312
Opens/inlet (MkI): 18 deg BTDC
Closes/inlet (MkI): 58 deg ABDC
Opens/exhaust (MkI): 58 deg BBDC
Closes/exhaust (MkI): 18 deg ATDC
Max tappet acceleration at flank: 210 m/s² @1000rpm (engine)
Max neg. tappet acceleration at nose: 73 m/s² @1000rpm (engine)
Guide: Material: Cast iron BS 1452/14
Length: 2.72″
Outside dia., inlet: 0.502″
Inside dia., inlet: 0.313″
Clearance, inlet: 0.0023/0.0008″
Outside dia., exhaust: 0.501″
Inside dia., exhaust: 0.312″
Inside dia., inlet: 0.313″
Clearance, exhaust: 0.0030/0.0015″
Fuelling
Carburettor type (2 off):
2000 Mk1 (-MB 60718): Stromberg 150 CD – 7A
2000 Mk1 (MB 60718-): Stromberg 150 CD – 6J
2000 Mk2 (-69): Stromberg 150 CDS – 5AW
2000 Mk2 (-70): Stromberg 150 CD3 – B5BU
2000 Mk2 (-72): Stromberg 150 CD3 – B5BG
2000 Mk2 (-73): Stromberg 150 CDSE – B5CB
2000 Mk2 (-73): S.U. HS4 – A.B.U.
2000 Mk2 (74-): S.U. HS4 – BCY
2500TC/S Mk2 (74-): S.U. HS6 – BDU
Injection system:
2·5PI Mk1/Mk2: Lucas Mark 2
Injection line pressure: 106 to 110 psi
Injector opening pressure: 50 psi
Ignition
Spark plugs: Champion N-9Y or N12Y

Alternative: Bosch W8DC

Spark plug gap: 0.65 mm
Distributor: Lucas 25 D6 (early) or 45 D6 (late)
Distributor points gap: 0.4 mm
Distributor dwell angle: 35±3°
Firing order: 1-5-3-6-2-4 (1 in front)
Ignition timing:
2000 (-73): 8° BTDC
2000/2500 (74-): BTDC
2·5PI (-72): 8° BTDC
2·5PI (73-): 2° BTDC
Electrical System
Voltage: 12V
Polarity:
Mk1 (-MB 600000): Positive earth
Mk1 (MB 600000-)/Mk2: Negative earth
Generator: Lucas C40L, output 25A
Alternator:
Mk1: Lucas 15AC output 28A
Mk2: Lucas 15ACR output 28A
Mk2 (alternative): Lucas 17ACR output 36A
Starter motor:
Mk1 (early): Lucas M35G
Mk1 (late) / Mk2 (early): Lucas M418G pre-engaged
Mk2 (late): Lucas M100 pre-engaged
Drivetrain
Gearbox (manual): Standard-Triumph, 4 speed plus reverse, syncromesh on all forward gears
Housing material: Al BS.1490 LM4M
Clutch (manual): Diaphragm 8½” diameter, hydraulically operated
Optional overdrive: Laycock de Normanville type ‘A’ (early) or type ‘J’ (late)
Gearbox (automatic): Borg Warner Type 35 or Type 65
Manual gear ratios:
1st: 3.281:1
2nd: 2.10:1
3rd: 1.386:1
3rd OD ‘A': 1.14:1
3rd OD ‘J': 1.11:1
4th: 1:1
4th OD ‘A': 0.82:1
4th OD ‘J': 0.797:1
Reverse: 3.37:1
Automatic gear ratios:
1st Type 35: 2.39:1
2nd Type 35: 1.45:1
3rd Type 35: 1:1
Reverse: 2.09:1
Final drive:
Type: 1″ offset hypoid, 2 pinions
Ratio 2000 manual: 4.1:1
Ratio 2500/2·5PI manual: 3.45:1
Ratio auto: 3.7:1
Output shaft material: EN24 steel
Propeller shaft:
Length: 45″ (with variations)
Tube: Dia 2.25″, wall 0.064″
Steering
Type:
Alford and Alder rack-and-pinion
Ratio: 21:1
Turns, lock-to-lock: 4
Turning circle between kerbs: 9.75m
Wheels and Tyres
Rim: Offset (inset):
2000/2·5PI Mk1: 4½J-13″ steel disc
2000/2·5PI/2500TC Mk2: 5J-13″ steel disc
2500S Mk2: 5½5J-14″ cast alloy 19mm
Bolt circle
All models: 4 on 4½” circle
Tyres:
2000 Mk1 saloon: 6.5-13 cross-ply
2000 Mk1 saloon/estate: 175-13 radial
2·5PI Mk1/Mk2: 185-13 radial
2000/2000TC/2500TC Mk2: 175-13 radial
2500TC Mk2: 185-13 radial
2500S Mk2: 175-14 radial
Pressure:
Front: 24 PSI
Rear: 24 PSI
Dimensions and weights
Overall length:
Saloon Mk1: 4.41 m
Estate Mk1: 4.41 m
Saloon Mk2 (-74): 4.63 m
Saloon Mk2 (74-): 4.66 m
Estate Mk2 (-74): 4.50 m
Estate Mk2 (74-): 4.53 m
Overall width:
Mk1: 1.65 m
Mk2 (-74): 1.69 m
Mk2 (74-): 1.71 m
Overall height:
Mk1/Mk2 (-74): 1.42 m
Mk2 (74-): 1.44 m
2500S Estate Mk2: 1.41 m
Wheelbase:
All models: 2690 mm
Track width, front:
Mk1: 1320 mm
Mk2: 1332 mm
Track width, rear:
Mk1: 1280 mm
Mk2 (-74): 1342 mm
Mk2 (74-): 1346 mm
Ground clearance:
Mk1: 150 mm
2000 Mk2 (-74): 114 mm
2·5PI Mk2 (-74): 102 mm
2·5PI Mk2 (74-): 114 mm
2000/2500TC/2500S Mk2 (74-): 127 mm
2500S Estate Mk2: 117 mm
Kerb weights:
2000 Saloon Mk1: 1170 kg
2000 Saloon Mk2: 1175 kg
2000 Estate Mk1: 1219 kg
2000 Estate Mk2: 1245 kg
2·5PI Saloon Mk1: 1195 kg
2·5PI Saloon Mk2: 1255 kg
2·5PI Estate Mk1: 1243 kg
2·5PI Estate Mk2: 1270 kg
2500TC Saloon Mk2: 1187 kg
2500TC Estate Mk2: 1233 kg>
2500S Saloon Mk2: 1223 kg
2500S Estate Mk2: 1289 kg
Body shell weight (white):
2000 Saloon Mk1: 334 kg
Engine dry weight:
2000: 183 kg
Gearbox and clutch weight:
Manual non O/D: 22.9 kg
Weight distribution F/R:
2000 Mk1: 53/47 %
Frontal area:
Mk1: 1.86 m²
Numbering system
Model: Period: Commission number: Engine number: Gearbox number: Rear axle number:
2000 Mk1 Oct 1963 – Oct 1969 MB1..120927 MB1 MB1 MB1
2·5PI Mk1 Jul 1968 – Oct 1969 MD1..6854 CR1 MD1 MD1
2000 Mk2 Sep 1969 – May 1974 ME1..100970 ME1 MB… ME1
2000 Facelift May 1974 – May 1975 ML1..9330 ML1 ME1 MF1
2000TC Mk2 May 1975 – May 1977 ML20000..29535 ML… ME… MF…
(Cars for Sweden) MH…
2·5PI Mk2 Oct 1969 – May 1974 MG1..85579 MG1 MD… MG1
2·5PI Facelift May 1974 – Jul 1975 MN1..2153 MN1
2500TC Mk2 May 1974 – May 1975 MM1..11880 MM1 MK1 MG…
2500TC Revised May 1975 – May 1977 MM20000..39373 MM… MK… MG…
(CKD kits) MK…
2500S Mk2 May 1975 – May 1977 MP1..10253 MM… MK… MG…
Paint colours
Black: #11 Black
Red: #12 Matador #22 Cherry #32 Signal #42 Burgundy
#52 Scarlet #62 Inca red #72 Pimento #82 Carmine
#92 Magenta
Brown: #13 Light Tan #23 Sienna #33 New Tan #43 Saddle Tan
#53 Dark Brown #63 Chestnut #73 Maple #83 Maple
#93 Russet
Yellow: #14 Jonquil #24 Wimpey Yellow #34 Jasmine Yellow #44 Beige
#54 Saffron #64 Mimosa #74 Beige #84 Topaz
#94 Inca
Green: #15 Cactus #25 Conifer #35 Olive #45 Lichfield
#55 Laurel #65 Emerald #75 British Racing Green #85 Java
Blue: #16 Midnight #26 Wedgwood #36 Dark Blue #46 Renoir
#56 Royal #66 Valencia #76 Print Blue #86 Navy Blue
#96 Sapphire #106 Mallard #116 Ice Blue #126 French Blue
#136 Delft #146 Tahiti
Purple: #17 Damson #27 Shadow Blue
Grey: #18 Gunmetal #28 Dark Grey #38 Phantom #48 Dolphin
#58 Shadow Blue #68 Slate #78 Grey
White: #19 White #29 Sebring White #39 Honeysuckle