Plymouth Road Runner

Plymouth Road Runner generations

The catalogue lists 1 generation, not a restyle as a separate generation.

The catalogue lists 1 generation, not a restyle as a separate generation.

1 generation ran from 1968-01-01 to 1970-12-31. Body type: Cabrio. Version count: 3 — 6.3 MT, 7.0 MT, and 7.2 MT. Each of those three versions shares the same generation start and stop dates: 1968-01-01 to 1970-12-31. Chassis layout in the data is the same across the generation: Independent, spring at the front; Dependent, leaf spring at the rear; Drum brakes front and rear.

Road Runner specs and engine table

Version names below are exactly as in the database. Fuel, cylinders, layout, boost, gearbox, and drive use the English labels from the data.

6.3 MT engine

6.3 MT is a Gasoline engine with 340 hp (250 kW). Peak-power rpm is not measured. Torque is 576 Nm; torque rpm is not measured. Displacement is 6276. Cylinders: 8. Layout: V-shaped. Valves per cylinder: 2. Boost: No. Fuel system: Carburetor. Compression ratio is not measured. Bore and stroke: 108 × 85.7. Engine position is not measured. Gearbox: Manual, 4 gears. Drive: RWD.

7.0 MT engine

7.0 MT is a Gasoline engine with 431 hp (317 kW). Peak-power rpm is not measured. Torque is 664 Nm; torque rpm is not measured. Displacement is 6981. Cylinders: 8. Layout: V-shaped. Valves per cylinder: 2. Boost: No. Fuel system: Carburetor. Compression ratio: 10.2. Bore and stroke: 108 × 95.3. Engine position is not measured. Gearbox: Manual, 4 gears. Drive: RWD.

7.0 MT is the highest-output version in this catalogue: 431 hp is 91 hp above 6.3 MT (340 hp) and 35 hp above 7.2 MT (396 hp). In kilowatts, 317 kW on 7.0 MT is 67 kW above 6.3 MT (250 kW) and 26 kW above 7.2 MT (291 kW).

7.2 MT engine

7.2 MT is a Gasoline engine with 396 hp (291 kW) at 4800 rpm. Torque is 664 Nm at 3200 rpm. Displacement is 7206 — the largest in the set, 225 above 7.0 MT (6981) and 930 above 6.3 MT (6276). Cylinders: 8. Layout: V-shaped. Valves per cylinder: 2. Boost: No. Fuel system: Carburetor. Compression ratio: 8.2, which is 2.0 lower than 7.0 MT (10.2). Bore and stroke: 109.7 × 95.3. Engine position is not measured. Gearbox: Manual, 4 gears. Drive: RWD.

7.2 MT matches 7.0 MT on torque (664 Nm on both). That figure is 88 Nm above 6.3 MT (576 Nm). 7.2 MT is the only version with measured power rpm (4800) and torque rpm (3200).

Shared across all three versions: Gasoline, 8 cylinders, V-shaped, 2 valves per cylinder, No boost, Carburetor, Manual 4, RWD.

Performance, top speed, and mpg

0–100 is not measured for 6.3 MT, not measured for 7.0 MT, and not measured for 7.2 MT.

Top speed is not measured for 6.3 MT. It is not measured for 7.0 MT. For 7.2 MT, top speed is 177.

mpg / fuel consumption (city, highway, combined) is not measured for 6.3 MT, not measured for 7.0 MT, and not measured for 7.2 MT. Tank size is not measured on all three. CO2 is not measured. Eco class is not measured. Fuel grade is not measured.

Because consumption is not measured, this catalogue cannot rank 6.3 MT, 7.0 MT, and 7.2 MT on mpg. The only performance number that is measured is top speed 177 on 7.2 MT.

Dimensions, weight, and clearance

Kerb weight is not measured for 6.3 MT, 7.0 MT, and 7.2 MT. Gross weight is not measured for all three. Ground clearance is not measured. Wheel sizes are not measured. Tank volume is not measured.

Suspension and brakes are measured and are the same on every version: front Independent, spring; rear Dependent, leaf spring; front Drum; rear Drum.

Reliability and problems

This dataset does not list failure rates, recalls, or typical problems for the Plymouth Road Runner. Reliability is not measured here. What is measured on the chassis is the same for 6.3 MT, 7.0 MT, and 7.2 MT: Independent, spring front suspension; Dependent, leaf spring rear; Drum front brakes; Drum rear brakes. Boost is No on all three, so there is no turbo or supercharger in these versions. All three use Carburetor fueling.

Which Road Runner version to choose

All three versions are Cabrio, 1 generation, 1968-01-01 to 1970-12-31, Gasoline, 8 cylinders, V-shaped, No boost, Carburetor, Manual 4, RWD.

Choose 6.3 MT if the priority is the smallest displacement and the lowest listed output: 6276, 340 hp, 250 kW, 576 Nm. Versus 7.0 MT, that is 705 less displacement, 91 hp less, 67 kW less, and 88 Nm less. Versus 7.2 MT, 6.3 MT is 930 smaller in displacement, 56 hp less (396 − 340), and 41 kW less (291 − 250). Bore and stroke on 6.3 MT is 108 × 85.7. Compression ratio on 6.3 MT is not measured. Top speed on 6.3 MT is not measured. 0–100 on 6.3 MT is not measured.

Choose 7.0 MT if the priority is peak power. 7.0 MT is 431 hp and 317 kW, the highest in this catalogue. Displacement is 6981, between 6.3 MT (6276) and 7.2 MT (7206). Torque is 664 Nm, equal to 7.2 MT and 88 Nm above 6.3 MT. Compression ratio 10.2 is the highest measured ( 7.2 MT is 8.2; 6.3 MT is not measured). Bore and stroke: 108 × 95.3. Power rpm and torque rpm on 7.0 MT are not measured. Top speed on 7.0 MT is not measured. 0–100 on 7.0 MT is not measured.

Choose 7.2 MT if the priority is the largest displacement and the only measured top speed. 7.2 MT is 7206, 396 hp (291 kW) at 4800 rpm, 664 Nm at 3200 rpm, compression 8.2, bore and stroke 109.7 × 95.3, top speed 177. Power is 35 hp below 7.0 MT and 56 hp above 6.3 MT. Displacement is largest; torque matches 7.0 MT. 0–100 on 7.2 MT is not measured. mpg on 7.2 MT is not measured.

Weights, tank, clearance, and wheels are not measured on any version, so they do not separate 6.3 MT, 7.0 MT, and 7.2 MT. Gearbox and drive also do not separate them: Manual 4 and RWD on all three.