| Mitsubishi 3B2 engine | |
| Manufacturer: | Mitsubishi Motors |
| Configuration: | Three cylinder |
| Production: | 2005–2020 |
| Predecessor: | Mitsubishi 3G8 engine |
| Successor: | NMKV BR06 engine |
| Length: | 286mm |
| Height: | 191mm |
| Weight: | 67kg (148lb) |
| Block: | Aluminum die cast |
| Head: | Aluminum die cast |
| Valvetrain: | Direct acting DOHC, 12 valves, intake continuously variable valve timing MIVEC |
| Fueltype: | Gasoline |
| Fuelsystem: | Fuel injection |
| Coolingsystem: | Water-cooled |
| Turbocharger: | On 3B20T only |
| Compression: | 8.8:1-10.8:1 |
| Bore: | 65.4mm 72mm |
| Stroke: | 65.4mm 81.8mm |
| Power: | NaNabbr=onNaNabbr=on |
| Torque: | NaN0NaN0 |
The Mitsubishi 3B2 engine is a family of all-alloy three cylinder engines developed by Mitsubishi Motors, first produced in December 2005 at the company's Mizushima powertrain facility in Kurashiki, Okayama,[1] for introduction in their 2006 Mitsubishi i kei car. All engines developed within this family have aluminum cylinder block and head, double overhead camshafts, four valves per cylinder, and MIVEC continuous variable valve timing.[1] [2]
The 3B20 was designed with the "rear midship" layout in mind but is not limited to that. The basic dimensions chosen reduced the powerplant's height, the cylinder block's structure was simplified, a timing chain was adopted, modularized components were used for the oil and water pumps, engine mounts, and fuel system.[1] The aluminum construction and lightweight parts and materials in the manifolds helped reduce the weight of the engine by 20 percent compared with its iron-block 3G83 predecessor, while gains were also seen in torque, fuel economy and emissions.[1] Bore pitch is 80 mm.
The preliminary version of the 659cc engine was first seen in the "i" Concept test car introduced in 2003, and used Mitsubishi's Smart Idling system which turns off the engine automatically when the vehicle is stationary, and can restart it within 0.2 seconds.[3] So equipped, Mitsubishi claimed the prototype was capable of fulfilling the "three litre initiative" for gasoline engines, meaning fuel consumption of no more than 3L/100 km.[3]
The larger 999cc capacity of the development engine was outside the limits of the kei class in Japan and was introduced in the second generation of the smart fortwo.[4]
| Production | 2006-2013 | 2013 - 2020 |
| Configuration | Three cylinder 45° inclined | Three cylinder upright |
| Valve Train | ||
| Aspiration | naturally aspirated | |
| Displacement | 659cc | |
| Bore x stroke | NaNmm | |
| Compression ratio | 10.8:1 | 10.9:1 or 12:1 |
| Fuel type | Regular unleaded gasoline | |
| Peak power | 38abbr=onNaNabbr=on at 7000 rpm | 36abbr=onNaNabbr=on at 6500 rpm |
| Peak torque | 570NaN0 at 4000 rpm | NaN0NaN0 at 5000-5500 rpm |
| Production | 2006-2013 | 2013 - 2020 |
| Configuration | Three cylinder 45° inclined | Three cylinder upright |
| Valve Train | ||
| Aspiration | turbocharger and Intercooler | |
| Displacement | 659cc | |
| Bore x stroke | NaNmm | |
| Compression ratio | 8.8:1 | 9.0:1 |
| Fuel type | Regular unleaded gasoline | |
| Peak power | 470NaN0 at 6000 rpm | 470NaN0 at 6000 rpm |
| Peak torque | 940NaN0 at 3000 rpm | 1000NaN0 at 3000 rpm |
This engine is also known as Mercedes-Benz M132 E10
| Engine Type | 3B21 | 3B21 | 3B21 (North America) |
|---|---|---|---|
| Configuration | Three cylinder, 45° inclined, DOHC | ||
| Aspiration | naturally aspirated | ||
| Displacement | 999cc | ||
| Bore x stroke | NaNmm | ||
| Compression ratio | 10.0:1 | ||
| Fuel type | 95 Octane | Premium unleaded gasoline | |
| Peak power | 450NaN0 at 5800 rpm | 520NaN0 at 5800 rpm | 500NaN0 at 6000 rpm |
| Peak torque | 890NaN0 at 3000 rpm | 920NaN0 at 4500 rpm | 920NaN0 at 3000 rpm |
This engine is also known as Mercedes-Benz M132 E10 AL
| Engine Type | 3B21T | 3B21T (Brabus) | 3B21T (Brabus) |
|---|---|---|---|
| Configuration | Three cylinder, DOHC | ||
| Aspiration | turbocharger and Intercooler | ||
| Displacement | 999cc | ||
| Bore x stroke | NaNmm | ||
| Peak power | 620NaN0 at 5250 rpm | 720NaN0 at 5500 rpm | 750NaN0 at 6000 rpm |
| Peak torque | 1200NaN0 at 3250 rpm | 1400NaN0 at 3500 rpm | 1470NaN0 at 2500 - 3600 rpm |