Triumph Stag: which version to buy and why
There is one Triumph Stag on this catalogue card: 1 generation (1970–1977), Cabrio, and a single named version — 3.0 MT. The buying question is therefore not “3.0 MT versus another Stag badge.” It is whether 3.0 MT itself matches what you need, once you put the measured figures next to the gaps marked not measured. Every number below is taken from that one version.
There is one Triumph Stag on this catalogue card: 1 generation (1970–1977), Cabrio, and a single named version — 3.0 MT. The buying question is therefore not “3.0 MT versus another Stag badge.” It is whether 3.0 MT itself matches what you need, once you put the measured figures next to the gaps marked not measured. Every number below is taken from that one version. Differences you can compute from those numbers are shown as arithmetic, not as extra catalogue facts.
Which version to buy (Stag, 1 generation)
3.0 MT is the only Stag version in the data. Production of 1 generation and of 3.0 MT both run 1970-01-01 to 1977-12-31. Body is Cabrio. If you want a Triumph Stag from this dataset, you are buying 3.0 MT or you are not buying a Stag here at all.
What you actually get, in buyer terms:
- Engine: Gasoline, 2997 cm³, 8 cylinders, V-shaped, 2 valves per cylinder, No boost, Carburetor, Front, longitudinal.
- Output: 145 hp (108 kW) at 5500 rpm; 226 Nm at 3500 rpm; compression 8.8; bore × stroke 86 × 64.5.
- Drivetrain: Manual, 4 gears, RWD.
- Chassis items that are listed: Independent, spring front; Dependent, spring rear; Disc front brakes; Drum rear brakes.
- Acceleration: 11.8 s to 100 km/h.
What you cannot use as a selection filter, because they are not measured for 3.0 MT: top speed, city / highway / mixed consumption, CO2, eco class, fuel type field, tank, kerb weight, gross weight, ground clearance, wheels.
There is no second Stag engine, no Automatic row, no extra-door body, and no restyle listed as a separate generation. “Which generation changed what” has a one-line answer: 1 generation is the whole run; nothing in the data splits 1970 from 1977 except the shared start and stop dates.
Specs that decide the purchase (engine, gearbox, drive)
| Version | hp | Nm | Displacement | Fuel | Cylinders | Layout | Boost | Gearbox | Drive |
|---|---|---|---|---|---|---|---|---|---|
| 3.0 MT | 145 | 226 | 2997 | Gasoline | 8 | V-shaped | No | Manual | RWD |
3.0 MT is a four-speed Manual RWD Cabrio with a naturally aspirated (boost: No) Gasoline V-shaped 8. If your shortlist requires Automatic, more than 4 gears, AWD, a closed body, or Forced induction, this table has no matching Stag. Those alternatives are not “worse Stags” in the data; they are absent.
Power and capacity of 3.0 MT:
- 145 hp ÷ 2997 cm³ = 48.4 hp per litre (145 ÷ 2.997 L).
- 108 kW ÷ 2.997 L = 36.0 kW per litre.
- 226 Nm ÷ 2.997 L = 75.4 Nm per litre.
Peak torque is listed at 3500 rpm; peak power at 5500 rpm. The gap is 2000 rpm (5500 − 3500). That is the only rpm spread the data give you: 3.0 MT is specified to make its torque peak 2000 rpm below its power peak, not as a high-rpm-only Gasoline 8.
Valves: 8 cylinders × 2 valves per cylinder = 16 valves on 3.0 MT. Boost is No, so there is no catalogue turbo or supercharger multiplier on those 145 hp.
Compression is 8.8. Bore × stroke is 86 × 64.5. Stroke is 21.5 mm shorter than bore (86 − 64.5). That geometry is in the data; it is not a second engine option.
Fuel system is Carburetor. The separate `fuel` field is not measured. Do not treat “Gasoline” and a named pump grade as two independent buyer choices: only Gasoline + Carburetor are labelled.
Engine: what the extra cylinders buy (and what they do not)
With one version, “extra money” cannot be priced. What can be compared is output versus the 2997 cm³ figure you are already paying displacement for.
- 145 hp on 2997 cm³ is 48.4 hp/L, as above.
- If the same 145 hp were spread over a hypothetical 1.0 L, specific output would be 145 hp/L; 3.0 MT is 145 ÷ 48.4 ≈ 3.0 times that litre-size, which is just restating 2997 cm³. The catalogue is not hiding a high-output Stag: 3.0 MT is the 145 hp row.
Cylinders: 8, V-shaped, Front, longitudinal. Layout and cylinder count are not inferred; they are the English labels on 3.0 MT. A buyer who wants an inline four Stag will not find one in this generation list (`modifikaciy`: 1).
Carburetor plus No boost plus 8.8 compression is the full induction story. There is no second map with injection or with boost that would change 145 hp or 226 Nm.
Performance: 0–100 vs what is not measured
3.0 MT reaches 100 km/h in 11.8 s. Maximum speed is not measured. Fuel consumption (city, highway, mixed) is not measured. CO2 is not measured.
So the only performance number you can rank 3.0 MT on, inside this card, is 11.8 s. You cannot compute “seconds per 10 hp” against a heavier or lighter Stag because kerb weight is not measured. You cannot compute km/h per hp because top speed is not measured. You cannot compute L/100 km per litre of displacement because mpg-style fields are not measured.
What you can write next to 11.8 s without inventing mass:
- 11.8 s with 145 hp means 11.8 ÷ 145 = 0.0814 s per horsepower if you treat time as inverse to power and ignore mass (mass is not measured, so this ratio is arithmetic on power and time only).
- 11.8 s with 226 Nm means 11.8 ÷ 226 = 0.0522 s per newton-metre, same caveat.
If a rival car on another page has a measured 0–100 and measured hp, compare those two pairs. Do not fill Stag top speed or Stag mpg from memory.
MPG, tank, and economy: all not measured
For 3.0 MT:
- City consumption: not measured
- Highway consumption: not measured
- Mixed consumption: not measured
- Tank: not measured
- CO2: not measured
- Eco class: not measured
A “which version sips less” section would be empty comparison. There is one version and zero consumption figures. Range cannot be estimated (tank not measured). If economy is your first filter, this dataset cannot rank 3.0 MT; it can only record that the filter has no Stag number to bite on.
Dimensions, weight, clearance, wheels
For 3.0 MT:
- Kerb weight: not measured
- Gross weight: not measured
- Ground clearance: not measured
- Wheels: not measured
- Tank: not measured (repeated here because buyers look for it under dimensions)
Weight per horsepower is therefore not measured (no kg, so no kg/hp). Payload is not measured (gross minus kerb needs both). Ground clearance cannot be used to choose a “higher” Stag. Wheel size cannot be used to choose a “larger-tyre” Stag.
What is specified for the chassis of 3.0 MT:
- Front suspension: Independent, spring
- Rear suspension: Dependent, spring
- Front brakes: Disc
- Rear brakes: Drum
Independent front vs dependent rear is a split axle design, not two trim levels. Disc front and Drum rear is one brake mix, not a “disc upgrade” option in this table.
Generations: what 1 generation actually is for a buyer
1 generation (kluch in source: years 1970–1977) is Cabrio only, 1 modification: 3.0 MT. Restyling is not listed as its own generation. You will not find an 11th-generation-style repeat name; you will find one generation paragraph.
Year choice inside 1970–1977 is not supported by extra spec rows. Start and stop of the generation equal start and stop of 3.0 MT. Buying “early” vs “late” is not a second version in this catalogue.
Body choice: Cabrio. If you need a hardtop name as a separate `body`, it is not in the generation list.
Problems and reliability (what the card does and does not measure)
The data do not include failure rates, recall counts, or service intervals. Reliability and “common problems” are not measured on this card. Do not treat Carburetor, 8 cylinders, or Drum rear brakes as a coded defect list; they are equipment labels.
What a buyer can treat as known constraints rather than rumours:
- Carburetor (not a second fuel-injection version).
- 8-cylinder V-shaped Gasoline, 2997 cm³, No boost.
- Manual 4 + RWD only.
- Rear brakes Drum, front Disc.
- Rear suspension Dependent, spring.
If those items are deal-breakers, 3.0 MT is the wrong car because they are the only Stag spec, not because a “better” Stag row exists beside them.
Which version to choose — arithmetic recap
| Buyer filter | 3.0 MT | Decision |
|---|---|---|
| Named version | 3.0 MT | Only Stag version |
| Generation | 1 generation, 1970–1977 | Only generation |
| Body | Cabrio | Only body |
| Power | 145 hp / 108 kW @ 5500 rpm | No higher-hp Stag |
| Torque | 226 Nm @ 3500 rpm | No higher-Nm Stag |
| Specific power | 48.4 hp/L | One figure, no sibling |
| Specific torque | 75.4 Nm/L | One figure, no sibling |
| 0–100 | 11.8 s | Only timed figure |
| Top speed | not measured | Cannot rank |
| MPG / CO2 / tank | not measured | Cannot rank |
| Kerb / gross / kg per hp | not measured | Cannot rank |
| Clearance / wheels | not measured | Cannot rank |
| Gearbox / drive | Manual, 4, RWD | No AT, no extra gears, no other drive |
| Boost | No | No forced-induction Stag |
| Cylinders / layout | 8, V-shaped, Front, longitudinal | No other engine layout |
| Valves | 2 per cylinder (16 total) | No 4-valve row |
| Compression | 8.8 | No second compression |
| Bore × stroke | 86 × 64.5 | Stroke 21.5 mm under bore |
Buy 3.0 MT if a 1970–1977 Triumph Stag Cabrio with Gasoline 2997 cm³, 145 hp, 226 Nm, Carburetor, Manual 4, RWD, and a measured 11.8 s to 100 km/h is the car you want, and you accept that speed, mpg, weights, tank, clearance, and wheels are not measured.
Do not wait for another Stag version on this card. There is no second name to distinguish by horsepower, no restyle generation, and no Automatic or extra-displacement row. Extra money, in catalogue terms, does not buy a second Stag spec; it would buy the same 3.0 MT figures again.
That is the whole choice: 3.0 MT or not this model.