tsr.gif (10196 bytes) Stag specifications and history

Index

Technical Specifications

Stag versus its Contemporary Rivals

Stag Performance Summary

Paint & Trim Colour Codes

Colour & Trim Changes by Model Year

Principal Production Modifications

Production Figures

Some More Background Reading

 

Technical Specifications

DRIVE LAYOUT Front engine mounted longitudinally, gearbox in-line, rear-wheel drive
ENGINE Type 90 V8 with five-bearing, cast-iron block and aluminium alloy cylinder heads with overhead valves. One overhead camshaft per cylinder bank.
Capacity 2997cc (182.9cu in)
Compression LF HE engines up to 20000: 8.80:1
LF HE engines, 20001 on: 9.25:1
LE UE engines, up to 20000: 8.00:1
LE UE engines, 20001 on: 7.75:1
Bore/stroke 86mm x 64.5mm (3.39in x 2.54in)
Max power LF HE engines, up to 20000: 145bhp DIN @ 5,500rpm
LF HE engines, 20000 on: 146bhp DIN @ 5,700rpm
LE UE engines, up to 20000: 127bhp @ 6,000rpm
LE UE engines, 20001 on: 127bhp @ 5,500rpm
Max torque LF HE engines, up to 20000: 170 Ibs/ft @ 3500rpm
LF HE engines, 20001 on: 167 Ibs/ft @ 3500rpm
LE UE engines, up to 20000: 142 Ibs/ft @ 3200rpm
LE UE engines, 20001 on: 148 Ibs/ft @ 3500rpm
Fuel system Engines numbered up to 20000:
two Zenith-Stromberg 175CD carburettors
Engines numbered 20001 on:
two Zenith-Stromberg 175 CDS (E)V carburettors
MANUAL GEARBOX Four forward speeds, all-synchromesh, driven through a 9in diameter single dry plate clutch
Laycock A-type overdrive operating on third and top gears optional prior to October 1972; standard from October 1972 to January 1973 except in certain export markets.

Laycock J-type overdrive operating on third and top gears standard from February 1973 except in certain export markets

Ratios: 2.995:1, 2.1:1, 1.386:1, 1.0:1; reverse 3.369:1. Overdrive 3rd (pre-February 1973 A type overdrive) 1.135:1, overdrive top 0.82:1. Overdrive 3rd (post-February 1973) 1.10:1, overdrive top 0.797:1.

AUTO GEARBOX
Pre-October 1976:

 

Borg Warner type 35 with three forward speeds, driven through a torque converter.
Ratios 2.39:1, 1.45:1, 1.0:1; reverse 2.09:1.
Post-October 1976: Borg Warner type 65 with three forward speeds, driven through a torque converter.
Ratios as for type 35.
FINAL DRIVE 3.70:1
DIMENSIONS  
  Length 14ft 5.75in (4420mm)
Width 5ft 3.5in (1612mm)
Height 4ft 1.5in (1258mm) with hood erected
Wheelbase 100 in (2540mm)
Track Front 52.5in (1330mm). Rear 52.9in (1340mm)
SUSPENSION Front: Independent with MacPherson struts, lower links, anti-roll bar and telescopic dampers.
Rear: Independent with semi-trailing arms, coil springs and telescopic dampers.
STEERING Power-assisted rack-and-pinion
BRAKES Servo-assisted split-circuit system with tandem master-cylinder
10.6in diameter discs at the front; 9in diameter drums at the rear.
WHEELS & TYRES  
  Pre-10/75 5.5J pressed-steel disc wheels with four-stud fixing and push-on trims. Centre-lock chromed wire wheels available until mid-1975 only (export only). Five-spoke alloy wheels optional from 1973. 185HR14 tyres (Michelin XAS fitted as standard to January 1973; Michelin XAS or Avon alternatives from February 1973)
Post-10/75 5.5J five-spoke alloy wheels standard. 185HR14 tyres (Michelin XAS or Avon fitted as standard).
WEIGHT 2981 Ibs (1355kg) with hard top.

 

THE STAG AND ITS RIVALS

 

Max speed

0-60mph

30-50mph

Overall

 

(mph)

(sec)

(sec)

mpg

Triumph Stag

116

9.3

8.1

20.7

MGB GT V8

125

7.7

6.2

19.8

Alfa Romeo 2000 GTV

115

8.9

10.9

20.8

Datsun 240Z

125

8.3

9.0

25.7

Lotus Elan +2S

121

7.7

8.5

21.0

Mercedes-Benz 280SL

121

9.3

8.8

19.0

Peugeot 504 V6 coupe

117

9.3

-

18.0

Ford Capri 3000GT

113

10.3

-

19.3

Reliant Scimitar GTE

120

8.7

7.6

21.7

Note: All figures are for cars with manual transmission, except for the Mercedes-Benz 280SL which had a four-speed automatic gearbox. The Ford was by far the cheapest of these cars and the Mercedes-Benz was expensive enough to fall into a completely different market sector.

Triumph Stag Performance
(from contemporary road tests)

UK market
manual/overdrive automatic
(1971 model) (1971 model)
Mean maximum speed (mph) 116 112
Maximum speeds in gears (mph)
Overdrive top 116
Top 113
Overdrive 3rd 105
3rd 92 113
2nd 61 89
1st 42 54
Acceleration (sec)
0-30mph 3.5 4.1
0 40mph 5.5 5.8
0-50mph 7.1 7.9
0-60mph 9.3 10.4
0-70mph 12.7 14.2
0-80mph 16.5 18.6
0-90mph 21.8 24.9
0-l00mph 29.2 34.5
Standing 1/4 mile  17.1 sec/ 82mph 17.9 sec/ 78mph


Acceleration on the move (sec)*

10-30mph 3.0 (1) 3.0 (1)
20-40mph 2.8 (1) 3.0 (1)
30-50mph 3.7 (2) 3.7 (1)
40 60mph 4.3 (2) 5.3 (2)
50-70mph 6.0 (3) 5.9 (2)
60 80mph 7.4 (3) 7.4 (2)
70-90mph 9.8 (3) 9 9 (3)
80 l00mph 13.3 (o/d 3) 14.8 (3)


Overall fuel consumption (mpg) 20.7 17.2
Typical fuel consumption (mpg) 22** 20
Kerb weight (lb) 2805 2835
Original test published Autocar, 10 June 1971 Autocar, 10 June 1971

* Figures given are the best times achieved; the figure in brackets is the gear used.

**This figure is from the original Autocar test of a pre-production manual/overdrive car published in the issue dated 30th July 1970.

 

Paint & Trim Colour Codes

 

Paint and trim colours are recorded on the Commission plate by means of two sets of two or three-digit colour codes. The codes are:

Code Colour Name Body Colour   Trim Colour
11 Black   black
17 Damson maroon  
19 White white  
23 Sienna brown  
26 Wedgwood Blue pale blue  
27 Shadow Blue pale blue  
32 Signal Red red  
43 Saddle Tan   mid-brown
54 Saffron Yellow dark yellow  
55 Laurel Green dark green  
56 Royal Blue very dark blue  
62 Inca Red   red
63 Chestnut   dark brown
64 Mimosa light yellow  
65 Emerald bright mid-green  
66 Valencia Blue mid-blue  
72 Pimento Red bright red  
74 Beige   beige
75 Brooklands Green dark green  
78 Grey   grey
82 Carmine dark red  
84 Topaz orange-yellow
85 Java bright green  
92 Magenta bright purple  
93 Russet Brown mid-brown  
94 Inca Yellow bright yellow  
.96 Sapphire Blue deep blue  
106 Mallard dark blue-green  
126 French Blue light blue  
136 Delft bright mid-blue  
AAE Russet Brown mid-brown  
CAA Carmine dark red  
HAB Java bright green  
JAE Tahiti Blue bright mid-blue  
NAF Leyland White white  

Although black was listed as a colour, it was never offered on the Stag as a production option.

Grey vinyl trim was only fitted to the Stag in the first year of production.

All Stags were built with vinyl (Ambla) upholstery. Neither leather nor cloth were ever a fitted options.

 

Colour And Trim Changes


Note: Triumph paint and trim changes are notoriously difficult to determine and this list may therefore not be exhaustive.

1970/71 model year

Damson   Black or Saddle Tan trim
Laurel   Black, Grey or Inca Red trim
Royal Blue   Black, Grey or Shadow Blue trim
Saffron   Black or Saddle Tan trim
Signal Red   Black or Saddle Tan trim
White   Black, Inca Red or Saddle Tan trim

Sills and tail panels were finished in body colour.

1972 model year

Damson   Black or Tan trim
Laurel Green   Black, Grey, Red or Tan trim
Saffron   Black or Tan trim
Sienna   Black or Tan trim
Signal Red   Black or Tan trim
White   Black, Red or Tan trim

1973 model year

Carmine   Black or Saddle Tan trim
Emerald   Black trim
French Blue   Black trim
Magenta   Black trim
Mallard   Black or Tan trim
Mimosa   Black or Chestnut trim
Pimento   Black or Chestnut trim
Sapphire Blue   Black or Shadow Blue trim
Sienna   Black or Saddle Tan trim
White   Black, Chestnut or Shadow Blue trim


For 1973, the tail panel was painted matt black, and the sills in black ripple effect. All cars had side-stripes in Aluminium, Black, or Gold.

1974 model year

Carmine   Black or Tan trim
Emerald   Black trim
French Blue   Black trim
Magenta   Black trim
Mallard   Black or Tan trim
Maple   Black or Tan trim
Mimosa   Black or Chestnut trim
Pimento   Black or Chestnut trim
Sapphire Blue   Black or Shadow Blue trim
White   Black, Chestnut, or Shadow Blue trim

1975 model year

Carmine   Beige or Chestnut trim
British Racing Green   Beige or Black trim
French Blue   Black trim
Delft   Beige or Black trim
Java   Beige or Black trim
Maple   Beige or Chestnut trim
Mimosa   Beige or Black trim
Pimento   Black trim
Topaz   Beige or Black trim
White   with Beige or Black trim


1976 model year

Carmine   Beige or Chestnut trim
French Blue   Black trim
Delft   Beige or Black trim
Java   Beige or Black trim
Maple   Beige or Chestnut trim
Mimosa   Beige or Black trim
Pimento   Black trim
Topaz   Beige or Black trim
White   Beige or Black trim

Sills now have bright cover plates and the tail lamp panel reverts to body colour.

1977 model year

Carmine   Beige or Chestnut trim
French Blue   Black trim
Delft   Beige or Black trim
Inca Yellow   Black trim
Java   Beige or Black trim
Leyland White   Beige or Black trim
Maple   Beige or Chestnut trim
Mimosa   Beige or Black trim
Pageant Blue   Beige or Black trim
Pimento   Black trim
Russet Brown   Beige trim
Tahiti Blue   Beige or Black trim
Topaz   Beige or Black trim
White   Beige or Black trim


Principal Production Modifications

Date Modification Commission Engine No
1970 Air cleaner/intake system has thermal sensor for warm-up LD 482
Four-bolt crankshaft flange changed to 6 bolt flange LF 509
1971 Bonnet release moved from offside dash to nearside dash T4284LD*
1972 No-loss cooling system introduced with sealed header tank LF 11,277
Cylinder head temperature warning switch deleted LF 13,344
Feb 73 Combustion chamber and piston design altered LF 20,001
Rostyle hub caps finish from black to matt chrome recesses LD 20,001
Left footrest introduced LD 20,001
Alternator changed from external to internal regulator LD 20,001
Distributor characteristics changed for emissions LD 20,001
Number plate lamps moved from bumper nacelle to boot lid LD 20,001
B post interior lamps (2) moved to T-bar (1) LD 20,001
Instrument bezels changed from all-black to black/chrome LD 20,001
Exterior ‘Stag’ badges background changed from grey to black LD 20,001
Stainless strip added to top of sill and black crinkle finish added to sill exterior LD 20,001
Rear lamp panel now finished in matt black LD 20,001
Flick-wipe stalk changed to intermittent windscreen wipe LD 20,001
Body side stripes added LD 20,001
reading lamp deleted from glove box lid LD 20,001
Seat design and cover materials changed, headrests on stalks LD 20,001
Overdrive goes from ‘A’ type to ‘J’ type Laycock LD 21,231
Door locks changed to anti-burst type T21883LD*
Cooling fan and Torquatrol unit upgraded to high capacity LD 24,662 LF 23,070
Carburettors changed to low emissions type LF 23,932
Hazard warning switch added to dashboard LD 25,000
1974 Dismantleable rear half-shafts introduced LD 32,900
1975 Speedometer trip knob taken from under dash to speedo face LD 35,940
High efficiency radiator introduced LD 36,373
Seat belt warning light added to dash LD 38,324
Manufacturer of power steering pump changed to Saginaw LF 41,970
Sept 75 Alloy wheels became standard, tyre size from 185 to 175x14" LD 40,001
Carburettors became tamper-proof LD 40,001 LF 42,914
Stainless strip deleted from top of sill, stainless steel sill covers added, rear lamp panel now body colour LD 40,001
1976 Automatic gearbox type 35 goes to type 65 LD 41,994
1977 Upgrade 6 to 12 blade water pump and cover LF 44,931
June 77 Last Stag built LD 45,722

* Due to inconsistent methods of recording change points, these two figures are actually body numbers.

 

Production Figures

Model Year UK Export Total
  Manual Automatic Manual Automatic Manual Automatic
1970 358 342 30 10 388 352
1971 1,291 699 1,221 690 2,512 1,389
1972 2,015 1,490 432 567 2,447 2,057
1973 1,511 1 683 1,138 1,176 2,649 2,859
1974 1,327 1,279 405 431 1,732 1,710
1975 935 1,051 440 472 1,375 1,523
1976 N/A N/A N/A N/A N/A N/A
1977 501 871 112 352 613 1,223
Totals 17,819 8,120 25,939


COMMISSION NUMBER SERIES

First off-tools car LD 1 14th November 1969
Second off-tools car LD 2 12th February 1970
First line-built car 1970 LD 3 13th March 1970
First car built in 1971 LD 748 2nd January 1971
First car built in 1972 LD 10760 3rd January 1972
First car built in 1973 LD 21087 2nd January 1973
First car built in 1974 LD 31153 4th January 1974
First car built in 1975 LD 34617 2nd January 1975
First car built in 1976 LD 40809 5th January 1976
First car built in 1977 LD 43908 4th January 1977
Last Stag built LD 45722 24th June 1977

Source: British Motor Industry Heritage Trust.

Some More Background Reading

It is suggested some of the following books might assist your research for your ‘own’ car, from deciding whether you want a manual or automatic, performance to be expected, and why the Stag was designed as it is. All these books are now officially out of print but may be available in specialist bookshops.

Triumph Cars: The Complete Story

By Graham Robson and Richard Langworth

Published by Motor Racing Publications

A full history of the Triumph marque, 'from Tri-Car to Acclaim'. Two respected journalists and industry commentators pool their considerable knowledge of the marque and come up with a good read. Graham Robson also worked for Triumph at the time of the launch of the Stag.

Triumph Stag, by Andrew Morland

Published by Osprey Publishing

An interesting book of many colour pictures of the Stag

Triumph Stag, 1970-1977: Choice, Purchase and Performance

By James Taylor

Published by Windrow and Greene Automotive.

A guide to the potential pitfalls of buying a Triumph Stag today.

Triumph Stag, 1970-1980

Published by Brooklands Books.

A collection of contemporary road tests and other reports on the Stag in Brooklands' well-known archive series, mainly emanating from the launch of the Stag in 1970.

Triumph Stag Collection, No.1

Published by Brooklands Books.

A smaller volume of reprinted road tests and other press materials on the Stag, compiled after the previous work.

Triumph Stag Restoration

Published by Kelsey Publishing

A collection of articles from ‘Practical Classics and Car Restorer’ magazine detailing the step-by-step restoration of a 1972 Mark I Stag. The restoration was carefully managed by the owner over a few weeks, using sub-contractors for all work apart from unit strip and re-assembly. It therefore shows how quickly the job can be done when money is no object.

Triumph Stag Super Profile

By James Taylor

Published by Haynes

A brief overview of the Stag for newcomers, lightweight and with plenty of photographs. The author was inaccurately briefed in preparation of this book.

Triumph Stag - The Complete History

by James Taylor and Dave Jell

Published by Windrow & Greene Automotive Ltd

The latest and definitive volume on the Stag, with James Taylors journalistic skills and the knowledge of Dave Jell. Nevertheless contains some omissions and inaccuracies but still very interesting for any Stag buyer and owner.