Renault 18

Which version: decision map by numbers

There is no Automatic 2.0 in this list.

Need the smallest engine and a Manual. Take 1.4 MT: 64 hp, 1397 cc, fuel 80, Manual 4, FWD. Power per litre is 64 ÷ (1397/1000) ≈ 45.8 hp/l. Rear suspension is Semi-independent, springorts hélicoïdaux, sem; front Independent, spring; front brakes Disc; rear Drum.

Same 64 hp, but Automatic. 1.4 AT is the same 64 hp / 47 kW, 1397 cc, fuel 80, FWD, but Automatic 3. You give up one gear versus the Manual 4 on 1.4 MT; output does not change.

Step up one displacement, stay on fuel 80, stay 4-speed Manual. 1.7 MT (73 hp) is 1647 cc, 73 hp / 54 kW, Manual 4, fuel 80. Versus 1.4 MT that is +9 hp and +250 cc. Power per litre is 73 ÷ 1.647 ≈ 44.3 hp/l — lower than the 1.4’s 45.8 hp/l. Rear suspension and rear brakes on this 1.7 MT (73 hp) are not measured (front remains Independent, spring and Disc). Treat that as a data gap, not as a chassis upgrade.

Same 1.7, still fuel 80, still Manual 4, more power. 1.7 MT (79 hp) is 79 hp / 58 kW, 1647 cc, Manual 4. Versus 1.7 MT (73 hp): +6 hp, same displacement, same 4 gears. Power per litre 79 ÷ 1.647 ≈ 48.0 hp/l. Rear is Semi-independent, springorts hélicoïdaux, sem; rear brakes Drum (measured, unlike the 73 hp twin).

Automatic pair to 79 hp. 1.7 AT (79 hp): 79 hp / 58 kW, Automatic 3, fuel 80. Same engine numbers as 1.7 MT (79 hp); the gearbox is Automatic 3 versus Manual 4.

First 5-speed Manual on the 1.7. 1.7 MT (97 hp): 97 hp / 71 kW, 1647 cc, fuel 80, Manual 5. Versus 1.7 MT (79 hp): +18 hp and +1 gear. Versus 1.4 MT: +33 hp. Power per litre 97 ÷ 1.647 ≈ 58.9 hp/l. Rear: Semi-independent, springorts hélicoïdaux, sem; Drum.

Automatic at 97 hp. 1.7 AT (97 hp): 97 hp / 71 kW, Automatic 3, fuel 80. Same output as 1.7 MT (97 hp); 3 Automatic ratios versus 5 Manual.

Fuel 92 starts here. 1.7 MT (109 hp): 109 hp / 80 kW, 1647 cc, fuel 92, Manual 5. Versus 1.7 MT (97 hp): +12 hp and a fuel change from 80 to 92. Rear suspension switches to Dependent, spring (not Semi-independent, springorts hélicoïdaux, sem). Power per litre 109 ÷ 1.647 ≈ 66.2 hp/l.

Automatic at 109 hp. 1.7 AT (109 hp): 109 hp / 80 kW, Automatic 3, fuel 92, rear Dependent, spring. Same engine and fuel as 1.7 MT (109 hp); 3 gears versus 5.

Peak 1.7, Manual. 1.7 MT (125 hp): 125 hp / 92 kW, 1647 cc, fuel 92, Manual 5, rear Dependent, spring. This is the highest output in the listed 12. Versus 1.7 MT (109 hp): +16 hp, same 1647 cc, same Manual 5, same fuel 92. Versus 1.4 MT: +61 hp. Power per litre 125 ÷ 1.647 ≈ 75.9 hp/l — the densest of the 12.

Peak 1.7, Automatic. 1.7 AT (125 hp): 125 hp / 92 kW, Automatic 3, fuel 92. Same peak output as 1.7 MT (125 hp); 3 Automatic gears versus 5 Manual.

The only 2.0. 2.0 MT: 105 hp / 77 kW, 1995 cc, fuel 80, Manual 4, FWD, torque 157 Nm (rpm not measured), top speed 185. Rear Dependent, spring; Drum. Power per litre 105 ÷ 1.995 ≈ 52.6 hp/l — below 1.7 MT (97 hp) at 58.9 hp/l and far below 1.7 MT (125 hp) at 75.9 hp/l. You buy 348 cc more than the 1.7s and 598 cc more than the 1.4s, but 20 hp less than 1.7 MT (125 hp) and 4 hp less than 1.7 MT (109 hp). What this version uniquely has in the table is the only measured torque (157 Nm) and the only measured top speed (185). 0–100 on 2.0 MT is still not measured.

There is no Automatic 2.0 in this list.

Engine and specs (all 12 listed versions)

Feed is Carburetor on all 12. Compression ratio, bore/stroke, and engine location are not measured.

Arithmetic that actually changes the choice

• Three displacements: 1397, 1647, 1995 cc.
• Six gasoline outputs: 64, 73, 79, 97, 105, 109, 125 hp (seven if you count 105 on the 2.0 separately from the 1.7 ladder).
• Power-per-litre order, high to low: 1.7 MT/AT (125 hp) ≈ 75.9 → 1.7 MT/AT (109 hp) ≈ 66.2 → 1.7 MT/AT (97 hp) ≈ 58.9 → 2.0 MT ≈ 52.6 → 1.7 MT/AT (79 hp) ≈ 48.0 → 1.4 MT/AT ≈ 45.8 → 1.7 MT (73 hp) ≈ 44.3. The 73 hp 1.7 is the least dense; the 125 hp 1.7 is the most. The 2.0 MT sits in the middle of that density ranking despite the largest capacity.
• Manual gear counts: 4 on 1.4 MT, both 1.7 MT at 73 and 79 hp, and 2.0 MT; 5 on 1.7 MT at 97 / 109 / 125 hp. Every Automatic here is 3 speeds: 1.4 AT, 1.7 AT (79), 1.7 AT (97), 1.7 AT (109), 1.7 AT (125).
• Fuel 80 covers 1.4s, 1.7s up to 97 hp, and 2.0 MT. Fuel 92 is only 1.7 MT/AT at 109 hp and 125 hp.

Performance and economy (mpg, 0–100, top speed)

0–100 km/h is not measured on all 12 versions.

Top speed is not measured on 1.4 MT, 1.4 AT, all 1.7 MT and 1.7 AT variants listed. The exception is 2.0 MT: top speed 185. That is the only figure you can use if “how fast on paper” is the filter; it does not prove the 125 hp 1.7 is slower — that 1.7’s top speed is not measured.

City, highway, and combined consumption are not measured on all 12. MPG cannot be ranked from this catalogue. CO2 and eco class are not measured.

Torque is not measured except 2.0 MT at 157 Nm. You cannot compare Nm across the 1.4 and 1.7 versions.

Dimensions and weight

Kerb weight: not measured (all 12). Gross weight: not measured. Tank: not measured. Wheel sizes: not measured. Weight per horsepower: not measured (no kerb mass).

Ground clearance: 160 mm on every listed version — no version buys extra clearance.

Chassis differences that are in the data:

• Front suspension: Independent, spring on all 12.
• Rear: Semi-independent, springorts hélicoïdaux, sem on 1.4 MT, 1.4 AT, 1.7 MT (79 hp), 1.7 AT (79 hp), 1.7 MT (97 hp), 1.7 AT (97 hp). Dependent, spring on 1.7 MT (109 hp), 1.7 AT (109 hp), 1.7 MT (125 hp), 1.7 AT (125 hp), 2.0 MT. Not measured on 1.7 MT (73 hp).
• Front brakes: Disc on all 12. Rear: Drum on all except 1.7 MT (73 hp), where rear brakes are not measured.

Body type for the generation is Sedan. Years do not differ by version in this extract: each listed modification is dated 1978-01-01 to 1986-12-31.

Generations (why generation-to-generation shopping does not apply)

Renault 18 has 1 generation in this data: 1 generation, 1978-01-01–1986-12-31, Sedan, 26 versions (12 shown). There is no restyle listed as a separate generation. You cannot pick “a later 18” for more power, more gears, or a different drive: FWD is universal here, and the power ladder, the 5-speed Manuals, fuel 92, and Dependent, spring rear all sit inside the same generation window.

Problems, reliability, and what the data does not buy

Reliability, known faults, and prices are not in this dataset. Do not treat missing 0–100 or missing mpg as “this car has no performance or no consumption.” They are not measured.

What you can treat as a real spec gap between twins: 1.7 MT (73 hp) leaves rear suspension and rear brakes not measured, while 1.7 MT (79 hp) records Semi-independent, springorts hélicoïdaux, sem and Drum. That is not a reason to invent a different axle; it is a reason not to assume the 73 hp car matches the 79 hp car’s rear sheet.

Which version to choose — short ranking from the numbers

1. Most power, densest engine, 5-speed Manual: 1.7 MT (125 hp) — 125 hp, ≈75.9 hp/l, fuel 92, Manual 5, rear Dependent, spring. Automatic equivalent: 1.7 AT (125 hp) with Automatic 3. 2. Same fuel 92 and 5-speed, 16 hp less: 1.7 MT (109 hp) / 1.7 AT (109 hp). 3. Highest 1.7 still on fuel 80, and the first 5-speed: 1.7 MT (97 hp); Automatic: 1.7 AT (97 hp). 4. Only measured top speed (185) and only measured torque (157 Nm): 2.0 MT — accept 105 hp, Manual 4, fuel 80, ≈52.6 hp/l, and 1995 cc. Do not pick it for peak power: 1.7 MT (125 hp) has 20 hp more from 348 cc less. 5. Fuel 80, 4-speed Manual, modest step from 1.4: 1.7 MT (79 hp); Automatic 1.7 AT (79 hp). 1.7 MT (73 hp) is 6 hp weaker and has rear chassis/brakes not measured. 6. Smallest engine: 1.4 MT or 1.4 AT, both 64 hp, 1397 cc, fuel 80. Choose Manual 4 vs Automatic 3.

If the filter is “Automatic,” the menu is only 1.4 AT (64 hp) and 1.7 AT at 79 / 97 / 109 / 125 hp — five cars, all Automatic 3, all FWD. If the filter is “Manual 5,” it is only the three 1.7 MT cars at 97 / 109 / 125 hp. If the filter is “do not require fuel 92,” drop the 109 and 125 hp 1.7s and keep the 1.4s, the 1.7s through 97 hp, and 2.0 MT.