General Specification Data from the official Triumph Stag Workshop Manual.
Engine
| Number of cylinders |
8, in V configuration |
| Bore |
86 mm (3.385 in.) |
| Stroke |
64.5 mm (2.539 in.) |
| Displacement |
2,997 cc (182.9 cu. in.) |
| Maximum power (1972 USA) |
127 b.h.p. at 6,000 r.p.m. |
| Maximum power (other markets) |
145 b.h.p. net at 5,500 r.p.m. |
| Maximum torque (1972 USA) |
1,705 lbf. in. at 3,200 r.p.m. |
| Maximum torque (other markets) |
2,040 lbf. in. at 3,500 r.p.m. |
| Timing chains (R.H. bank) |
9.52 mm (0.375 in.) pitch x 104 pitches |
| Timing chains (L.H. bank) |
9.52 mm (0.375 in.) pitch x 106 pitches |
| Oil warning light |
Extinguishes at 3 to 5 lb./in² |
Cooling System
| Thermostat |
82°C (180°F) |
| Pressure (early) |
13 lbf/in² (0.91 kgf/cm²) |
| Pressure (later) |
20 lbf/in² (1.41 kgf/cm²) |
Fuel System
| Fuel pump |
S.U. AUF 303 |
| Fuel pump pressure |
2.7 lbf/in² (0.19 kgf/cm²) |
| Carburetters |
Refer to Engine Tuning Data |
Clutch
| Driven plate diameter |
9 in. (228.6 mm.) |
| Facing material |
H 26 |
| Damper springs |
6 |
Gearbox (Manual)
| O/D Top |
0.82 : 1 (overall 3.04 : 1) |
| Top |
1.00 : 1 (overall 3.70 : 1) |
| O/D 3rd |
1.135 : 1 (overall 4.20 : 1) |
| 3rd |
1.386 : 1 (overall 5.13 : 1) |
| 2nd |
2.10 : 1 (overall 7.77 : 1) |
| 1st |
2.995 : 1 (overall 11.08 : 1) |
| Reverse |
3.369 : 1 (overall 12.47 : 1) |
| Overdrive |
Laycock de Normanville, operative on 3rd and top |
Automatic (Optional)
Final Drive
Steering
| Steering wheel diameter |
16 in. (407 mm.) |
| Turns lock to lock (1972) |
3 |
| Turns lock to lock (pre-1972) |
4 |
| Column adjustment (axial) |
4 in. (102 mm.) approx. |
| Column adjustment (vertical) |
2 in. (51 mm.) approx. |
Brakes
| Front |
Caliper disc brakes, disc dia. 10.625 in. (270 mm.) |
| Front lining material |
DON 225 FG or DON 227 |
| Rear |
Self-adjusting drum, 9 in. x 2.25 in. (228 mm. x 57 mm.), leading and trailing shoe |
| Rear lining material |
DON 202 GG |
| Servo |
Direct-acting, 3 : 1 nominal boost ratio |
| Total lining area |
102 sq. in. (658 cm²) |
| Total swept area |
347 sq. in. (2,240 cm²) |
Wheels
| Steel disc |
5J, flat hump, safety ledge rims |
| Wire wheels |
5.5J flat ledge rims |
