Smart 3B21, Engine
Атмосферный
| Engine capacity | 999 cm³ |
| Maximum power (range), hp | 71 |
| Maximum torque, N*m (kg*m) at rpm. | 92 (9) / 4500 |
| Fuel used | Premium gasoline (AI-98) |
| Fuel consumption, l/100 km | 4.5 - 5.4 |
| Engine type | In-line, 3-cylinder |
| Maximum power, hp (kW) at rpm | 71 (52) / 5800 |
| Compression Ratio (Range) | 11.5 |
| Cylinder diameter (range), mm | 72 |
| Piston stroke (range), mm | 81.8 |
| Valve drive | DOHC |
| Start-stop system |
Турбо
| Engine capacity | 999 cm³ |
| Maximum power (range), hp | 84 - 102 |
| Maximum torque, N*m (kg*m) at rpm. | 120 (12) / 2000 |
| Fuel used | Premium gasoline (AI-98) |
| Fuel consumption, l/100 km | 5.8 |
| Engine type | In-line, 3-cylinder |
| Maximum power, hp (kW) at rpm | 102 (75) / 6000 |
| Compression Ratio (Range) | 10 |
| Cylinder diameter (range), mm | 72 |
| Piston stroke (range), mm | 81.8 |
| Supercharger | Turbine |
| Valve drive | DOHC |
| Start-stop system |