Rover SD1

Rover SD1: which version to buy

If you are choosing a Rover SD1 rather than reading a history of the model, the useful split is not by generation — there is only 1 generation (1976–1986), Hatchback 5-door, 14 listed versions of which 12 are shown here — but by engine size and by how much power each name actually delivers.

If you are choosing a Rover SD1 rather than reading a history of the model, the useful split is not by generation — there is only 1 generation (1976–1986), Hatchback 5-door, 14 listed versions of which 12 are shown here — but by engine size and by how much power each name actually delivers. The same badge can hide two outputs: 2.6 MT is either 126 hp or 135 hp, 2.6 AT is the same pair, and 3.5 MT / 3.5 AT are either 150 hp or 193 hp. Buy by those horsepower figures, not by the name alone.

Every version is Gasoline, Carburetor, 92 fuel, RWD, Independent, spring front suspension, Disc front brakes, ground clearance 120 mm. Rear suspension, rear brakes, kerb weight, gross weight, tank, wheels, 0–100, top speed, city/highway/combined mpg, CO2 and eco class are not measured on every row. Weight-per-horsepower therefore cannot be calculated. What can be compared is power, torque where given, displacement, cylinder count, gearbox, engine position, and specific output (hp per litre).

Specs table: every named version

Valves per cylinder: 2 on all twelve. Engine position: Front, transverse on the 2.0 / 2.3 / 2.6 rows and on 3.5 MT / 3.5 AT at 150 hp; Central on 3.5 MT / 3.5 AT at 193 hp. Compression 10.5 and bore × stroke 88.9 × 71 are measured only on the four 3.5 rows.

What the extra displacement actually buys

Specific output (hp ÷ litres of the stated displacement):

• 2.0 MT / 2.0 AT: 97 ÷ 1.994 ≈ 48.6 hp/L
• 2.3 MT / 2.3 AT: 120 ÷ 2.259 ≈ 53.1 hp/L
• 2.6 MT / 2.6 AT at 126 hp: 126 ÷ 2.597 ≈ 48.5 hp/L
• 2.6 MT / 2.6 AT at 135 hp: 135 ÷ 2.597 ≈ 52.0 hp/L
• 3.5 MT / 3.5 AT at 150 hp: 150 ÷ 3.528 ≈ 42.5 hp/L
• 3.5 MT / 3.5 AT at 193 hp: 193 ÷ 3.528 ≈ 54.7 hp/L

The 2.3 six-cylinder and the 193 hp 3.5 are the densest engines in this catalogue. The 150 hp 3.5 is the least dense: you pay 931 cc over the 135 hp 2.6 (3528 − 2597) for only +15 hp (150 − 135). That is about 62 cc per extra horsepower. By contrast, the step from 2.0 to 2.3 is +265 cc for +23 hp (about 11.5 cc per extra hp) at identical 164 Nm.

Peak torque is 164 Nm at 3000 rpm on 2.0 MT, 2.0 AT, 2.3 MT and 2.3 AT. On both 2.6 power levels torque is not measured. On all four 3.5 versions torque is 280 Nm at 2600 rpm — +116 Nm versus the 2.0/2.3 figure, and 400 rpm earlier. If the question is “what does the big engine buy?”, the measured answer is torque and displacement, not automatically the highest specific power: the 150 hp 3.5 already has the 280 Nm, same as the 193 hp pair.

Duplicate names: always check horsepower

2.6 MT (126 hp) versus 2.6 MT (135 hp): same 2597 cc, same 6 Inline, same Manual 5, same RWD. The second is +9 hp / +6 kW (135 − 126; 99 − 93), about +7%. Specific output rises from 48.5 to 52.0 hp/L. Rpm and torque remain not measured on both, so you cannot prove a torque gain — only a power gain.

2.6 AT (126 hp) versus 2.6 AT (135 hp): the same +9 hp split behind Automatic 3.

3.5 MT (150 hp) versus 3.5 MT (193 hp): same 3528 cc, same 4 Inline, same 280 Nm @ 2600, same compression 10.5, same 88.9 × 71, same Manual 5, same RWD. The second is +43 hp / +32 kW (193 − 150; 142 − 110), about +29%, and specific output jumps from 42.5 to 54.7 hp/L. Engine position changes from Front, transverse (150 hp) to Central (193 hp). That is the only engine-location difference in the whole model.

3.5 AT (150 hp) versus 3.5 AT (193 hp): the same +43 hp and the same Front, transverse → Central change, with Automatic 3 instead of Manual 5.

If two cars are both labelled 3.5 MT, the 193 hp car is 43 hp stronger at the same torque number. If they are both 2.6 MT, the gap is only 9 hp and torque is not measured either way.

Manual 5 versus Automatic 3

Every displacement is offered both ways. Manual always has 5 gears; Automatic always has 3. Power, torque, displacement, cylinders, fuel, boost, drive and clearance do not change with the gearbox on a given engine.

• 2.0 MT vs 2.0 AT: both 97 hp / 164 Nm / 1994 cc.
• 2.3 MT vs 2.3 AT: both 120 hp / 164 Nm / 2259 cc.
• 2.6 MT vs 2.6 AT: match the 126 pair to the 126 pair, and the 135 pair to the 135 pair — do not mix them.
• 3.5 MT vs 3.5 AT: match 150 to 150, 193 to 193.

0–100 and mpg are not measured for any gearbox, so the catalogue cannot claim the Automatic is slower or thirstier. The only measured gearbox fact is gear count: 5 versus 3.

Engine family: 4-cylinder versus 6-cylinder

From the data, not from outside names:

• 4 Inline: 2.0 (1994 cc, 97 hp) and all 3.5 (3528 cc, 150 or 193 hp).
• 6 Inline: 2.3 (2259 cc, 120 hp) and both 2.6 outputs (2597 cc, 126 or 135 hp).

Moving from 2.0 MT (4 cylinders, 97 hp) to 2.3 MT (6 cylinders, 120 hp) adds 2 cylinders, 265 cc and 23 hp, and leaves torque at 164 Nm. Moving from the strongest six, 2.6 MT (135 hp), to 3.5 MT (150 hp) drops cylinder count from 6 to 4, adds 931 cc and 15 hp, and is the first step where 280 Nm is measured. The 193 hp 3.5 stays at 4 Inline.

Boost is No on every version; nobody is buying a forced-induction SD1 in this table.

Performance, mpg, dimensions

0–100: not measured on all twelve versions. Top speed: not measured on all twelve. City / highway / combined consumption: not measured on all twelve. CO2 / eco class: not measured. Kerb weight / gross weight: not measured — power-to-weight cannot be ranked. Fuel tank: not measured. Wheels: not measured. Ground clearance: 120 mm on every version; no high-clearance or lowered SKU. Rear suspension / rear brakes: not measured.

A buyer comparing “which is faster” or “which uses less fuel” has no measured answer in this dataset. The ranking that is measured is peak power: 97 → 120 → 126 → 135 → 150 → 193 hp. Torque ranking that is measured: 164 Nm (2.0 and 2.3) versus 280 Nm (all 3.5); 2.6 torque is a gap, not a middle value.

Which version to choose

Entry / simplest 4-cylinder. 2.0 MT or 2.0 AT: 97 hp, 71 kW, 164 Nm, 1994 cc, 4 Inline, Front, transverse. Lowest power and lowest displacement. Same torque as the 2.3. Choose 2.0 MT if you want Manual 5; 2.0 AT if you want Automatic 3. You give up 23 hp versus 2.3 for 265 cc less.

Best measured efficiency of the small engines. 2.3 MT or 2.3 AT: 120 hp from 2259 cc ≈ 53.1 hp/L, still 164 Nm, now 6 Inline. Versus 2.0, that is +23 hp at unchanged torque. Versus 2.6 (126 hp), you give up only 6 hp and 338 cc, and you keep measured torque and rpm (5500 / 3000) that the 2.6 does not publish.

Middle six, two strengths. Prefer 2.6 MT (135 hp) or 2.6 AT (135 hp) over the 126 hp twins: +9 hp at the same 2597 cc. Do not pick 126 hp unless that is the car in front of you — the name 2.6 MT / 2.6 AT is not unique. Torque and peak-rpm are not measured, so this step is a power-only upgrade.

Torque, not peak power: 150 hp 3.5. 3.5 MT (150 hp) and 3.5 AT (150 hp) bring 280 Nm @ 2600 and 3528 cc, Front, transverse, compression 10.5. Versus 2.6 (135 hp) you gain 15 hp and a measured 280 Nm, at the worst specific output in the line (42.5 hp/L). If the goal is the large-engine torque figure without the 193 hp state, this is that pair.

Maximum power in the catalogue. 3.5 MT (193 hp) or 3.5 AT (193 hp): 193 hp / 142 kW @ 5200, 280 Nm @ 2600, 3528 cc, 4 Inline, Central, Manual 5 or Automatic 3, RWD. Versus the 97 hp 2.0 that is +96 hp (almost double). Versus the 150 hp 3.5 it is +43 hp at the same 280 Nm, plus the only Central engine position. Highest specific output: ≈54.7 hp/L.

Manual vs Automatic, once the engine is chosen. There is no measured 0–100 or mpg gap. The measured difference is 5 gears versus 3.

What this generation does not change. One generation only (1976–1986), one body (Hatchback 5-door), one drive (RWD), one fuel type (Gasoline), one boost state (No), one clearance (120 mm). There is no later generation to “wait for” in this dataset; the choice is entirely among the twelve named versions and the horsepower hidden behind repeated names.