Which K70 version to buy
If the brief is a usable family Sedan from this model’s only generation, the 1.6 MT with 90 hp is the version that changes the most for the least extra mass. It keeps the 1605 cc engine, 1060 kg kerb weight, and 1510 kg gross weight of the 75 hp 1.6 MT, but adds 15 hp and 12 Nm and raises top speed from 148 to 158 km/h.
If the brief is a usable family Sedan from this model’s only generation, the 1.6 MT with 90 hp is the version that changes the most for the least extra mass. It keeps the 1605 cc engine, 1060 kg kerb weight, and 1510 kg gross weight of the 75 hp 1.6 MT, but adds 15 hp and 12 Nm and raises top speed from 148 to 158 km/h. Power per litre rises from 46.7 to 56.1 hp/L; kilograms per horsepower fall from 14.1 to 11.8. Compression goes from 8 to 9.5. Nothing else in the measured chassis package changes: still No boost, Carburetor, Front, transverse, Inline 4, 2 valves per cylinder, FWD, 4-speed Manual, 52 L tank, Independent, spring front suspension, Disc front brakes.
The 1.8 MT is the peak of the range on paper: 100 hp, 152 Nm, 162 km/h. It is also the only version that adds weight: 1100 kg kerb (+40 kg vs both 1.6 MT cars) and 1560 kg gross (+50 kg). Displacement is 1807 cc (+202 cc), bore/stroke 87 × 76 instead of 82 × 76. Versus the 90 hp 1.6 MT you gain 10 hp and 18 Nm and 4 km/h of top speed, while power per litre actually slips slightly (55.3 hp/L vs 56.1). Kilograms per horsepower improve only a little further, to 11.0. If the extra 10 hp and 18 Nm matter more than 40 kg, take the 1.8 MT. If you want the strongest specific output and the same 1060 kg as the base car, take the 90 hp 1.6 MT.
The 75 hp 1.6 MT is the version to buy only if you want the lowest compression (8) and the smallest peak numbers. It is not lighter than the 90 hp twin. 0–100, city/highway/combined fuel use, CO2, eco class, ground clearance, wheel size, rear suspension, and rear brakes are not measured on every version, so they cannot break the tie.
Generations: what actually changed
One generation only: 1 generation, Sedan, 1970-01-01 to 1974-12-31, 3 versions. There is no restyling generation and no second body type in the data. Every version shares FWD, Manual 4, Gasoline, Carburetor, Front, transverse, Inline 4, 2 valves per cylinder, No boost, 52 L tank, Independent, spring front, Disc front brakes. The generation did not add a different gearbox, drive, or fuel type. The spread inside the generation is engine size, compression, power, torque, top speed, and the 1.8 MT weight step.
Engine specs compared
| Version | hp (kW @ rpm) | Nm @ rpm | cc | Fuel | Cylinders / layout | Boost | Gearbox | Drive |
|---|---|---|---|---|---|---|---|---|
| 1.6 MT (75 hp) | 75 (55 @ 5200) | 122 @ 3500 | 1605 | Gasoline | 4 Inline | No | Manual 4 | FWD |
| 1.6 MT (90 hp) | 90 (66 @ 5200) | 134 @ 4000 | 1605 | Gasoline | 4 Inline | No | Manual 4 | FWD |
| 1.8 MT | 100 (74 @ 5300) | 152 @ 3750 | 1807 | Gasoline | 4 Inline | No | Manual 4 | FWD |
Both 1.6 MT engines share 82 × 76 bore and stroke. The 90 hp unit is the same 1605 cc with higher compression (9.5 vs 8) and torque peak 500 rpm later (4000 vs 3500). The 1.8 MT keeps stroke 76 and raises bore to 87, compression 9.5, power peak 5300 rpm, torque peak 3750 rpm.
Specific output:
- 1.6 MT 75 hp: 46.7 hp/L, 76.0 Nm/L
- 1.6 MT 90 hp: 56.1 hp/L, 83.5 Nm/L
- 1.8 MT 100 hp: 55.3 hp/L, 84.1 Nm/L
The 90 hp 1.6 MT is the most power-dense. The 1.8 MT is the most torque-dense by a slim 0.6 Nm/L.
Performance, mpg, and what is not measured
Top speed is the only performance figure measured for all three:
- 1.6 MT 75 hp: 148 km/h
- 1.6 MT 90 hp: 158 km/h (+10 km/h, same 1060 kg)
- 1.8 MT: 162 km/h (+4 km/h vs 90 hp, +14 km/h vs 75 hp)
0–100 is not measured for 1.6 MT (75 hp), 1.6 MT (90 hp), and 1.8 MT. City, highway, and mixed consumption are not measured. CO2 is not measured. Eco class is not measured. Fuel grade is not measured. You cannot rank mpg or sprint times from this catalogue; you can rank top speed and the power/weight arithmetic above.
Power-to-weight (kerb):
- 1.6 MT 75 hp: 14.1 kg/hp (75 hp / 1060 kg)
- 1.6 MT 90 hp: 11.8 kg/hp (90 / 1060) — 16.7% more power, 0% more kerb
- 1.8 MT: 11.0 kg/hp (100 / 1100) — 11.1% more power than the 90 hp car, 3.8% more kerb
Gross-weight headroom is 450 kg on both 1.6 MT cars (1510 − 1060) and 460 kg on the 1.8 MT (1560 − 1100). Payload capacity is effectively the same class of Sedan.
Dimensions, weight, tank, wheels
Ground clearance is not measured. Wheel size is not measured. Rear suspension is not measured. Rear brakes are not measured.
What is measured and shared or not:
- Tank: 52 L on 1.6 MT (75 hp), 1.6 MT (90 hp), and 1.8 MT
- Kerb: 1060 kg (1.6 MT both), 1100 kg (1.8 MT)
- Gross: 1510 kg (1.6 MT both), 1560 kg (1.8 MT)
- Front suspension: Independent, spring (all)
- Front brakes: Disc (all)
There is no dimensional reason in the data to pick one generation over another: there is only 1 generation. The 1.8 MT is the heavier car; the two 1.6 MT versions are identical on mass and tank.
Reliability and problems: what the specs do and do not tell you
No failure rates, recalls, or owner-problem counts are in the data. What you can say without inventing history:
All three versions are Carburetor Gasoline engines with No boost and a 4-speed Manual. There is no automatic, no diesel, no AWD, no turbo to choose or avoid. Compression 8 on the 75 hp 1.6 MT is the mildest; both stronger engines run 9.5. If lower compression is the only mechanical preference you can justify from the numbers, that is the 75 hp 1.6 MT. If you want the same block size and weight with 20% more horsepower (15 / 75), that is the 90 hp 1.6 MT. The 1.8 MT is the only version that changes bore, displacement, and kerb weight.
Which version to choose, in one pass
Buy the 1.6 MT (90 hp) when you want the best power-per-litre (56.1 hp/L), the same 1060 kg as the base car, +15 hp / +12 Nm / +10 km/h versus the 75 hp 1.6 MT, and you do not need the last 10 hp.
Buy the 1.8 MT when peak 100 hp, 152 Nm, and 162 km/h matter more than 40 kg extra kerb and 202 cc extra displacement. You pay 40 kg for 10 hp over the 90 hp 1.6 MT (4 kg per extra horsepower on that step) and gain 4 km/h of top speed.
Buy the 1.6 MT (75 hp) only if you specifically want 8 compression, 122 Nm at 3500 rpm, and 148 km/h. It is not lighter, not smaller in tank, not a different gearbox or drive. It is the same 1.6 MT nameplate with 15 hp and 12 Nm less than its twin.
There is no second generation, no restyle row, and no body other than Sedan. Prices are not in the data. 0–100, mpg, CO2, clearance, and wheels are not measured, so they cannot overturn the ranking built from power, torque, top speed, displacement, compression, and weight.