The 1.0-liter 3-cylinder Mitsubishi 3B21 engine was assembled in Japan from 2006 to 2014 and installed on the second generation of the W451 Smart Fortwo model, popular in Europe. Such a power unit according to the nomenclature of the Daimler-Chrysler concern is known as the Mercedes M132.
The 3B2 family also includes engines: 3B20, 3B20T and 3B21T.
The engine was installed on:
- Smart Fortwo 2 (W451) in 2006 – 2014.
Specifications
| Production years | 2006-2014 |
| Displacement, cc | 999 |
| Fuel system | distributed injection |
| Power output, hp | 61 – 71 |
| Torque output, Nm | 89 – 92 |
| Cylinder block | aluminum R3 |
| Block head | aluminum 12v |
| Cylinder bore, mm | 72 |
| Piston stroke, mm | 81.8 |
| Compression ratio | 11.4 |
| Features | DOHC |
| Hydraulic lifters | no |
| Timing drive | chain |
| Phase regulator | MIVEC |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 3.3 |
| Fuel type | petrol |
| Euro standards | EURO 4/5 |
| Fuel consumption, L/100 km (for Smart Fortwo 2008) — city — highway — combined |
6.1 4.0 4.7 |
| Engine lifespan, km | ~200 000 |
| Weight, kg | 67 (without attachments) |
Disadvantages of the Mitsubishi 3B21 engine
- The engine exists in two versions and a simple modification does not cause trouble;
- In the MHD hybrid, the starter-alternator belt warps and wears out quickly;
- A broken belt causes the pump to stop and the head immediately leads due to overheating;
- By 100,000 km, the rubber rings on the candle wells are tanned and oil gets there;
- There are no hydraulic lifters and valve clearances need to be adjusted every 100,000 km.
