BMW M20B20 Engine
This page lists the M20B20 specifications for the engine built by BMW.
| Fuel Type | Petrol |
|---|---|
| Configuration | I6 |
| Combustion Type | Naturally Aspirated |
| Displacement (cc) | 1,991 cc |
| Cylinders | 6 |
| Cylinder Bore (mm) | 80 mm |
| Cylinder Stroke (mm) | 66 mm |
| Valves | 12 |
| Valves Per Cylinder | 2 |
| Valvetrain | SOHC |
| Compression Ratio | 8.8:1 |
| Power (kW) | 95 kW @ 6,000 RPM |
| Torque (N⋅m) | 164 N⋅m @ 4,300 RPM |
| Redline (RPM) | 3,200 RPM |
| Weight (kg) | |
| Production | 1976 - 1992 |
Where listed, power output figures are based on the most powerful production variant of that engine, because some manufacturers use different engine maps to tune the same engine for better fuel economy, performance or to differentiate models in the range.
The M20B20 initially used a Solex 4A1 four-barrel carburetor, had a compression ratio of 9.2:1 and a redline of 6,400 RPM.
The M20B20 first became fuel-injected in 1981, with Bosch K-Jetronic used. The compression ratio was raised to 9.9:1.
In September 1982 (coinciding with the release of the E30 3 Series), the fuel injection was updated to LE-Jetronic with a redline of 6,200 RPM. Other upgrades included a larger port (known as "731") cylinder head, a lighter block and new manifolds.
In 1987, the M20B20 was again revised with the addition of Bosch Motronic engine management, a catalytic converter and a compression ratio of 8.8:1.
The M20B20 was not sold in North America.
Last Updated: 19th October 2020 at 20:58:16