Configuration Inline-6 Diesel engine | Production 1998–present | |
 | ||
Displacement 2497 cm2926 cm2993 cm Piston stroke 80 × 82,8 mm84 × 88 mm84 × 90 mm Cylinder block alloy Cast ironAluminum (TÜ2 onwards) | ||
The BMW M57 is a straight-6 diesel engine produced from 1998. It is produced in the upper Austrian engine plant in Steyr.
Contents
Description
The M57 is a water-cooled and turbocharged inline six cylinder diesel engine with common-rail-injection. It was revised twice during its production time. It is based on its predecessor M51. The block and the crankcase of the first M57 engines and the TÜ (Technische Überarbeitung = revision) engines are made of cast iron, TÜ2 engines are made of aluminium instead. The combustion chamber was also changed in the TÜ2. The injection pressure is 1350 bar in the 2.5l engine, all other engines use a pressure of 1600 bar instead. For fuel injection, magnetic injectors are used, except from the TÜ2 OL and TOP engines, which make use of piezo injectors. The common-rail-system is made by Bosch and also controlled by a Bosch DDE 5 ECU. The M57 is equipped with one variable geometry turbocharger and an intercooler, except from the M57D30TÜTOP, which has a BorgWarner KP39 high-pressure and a K26 low-pressure turbocharger. The compression ratio reaches from 16,5:1 to 18:1, M57 engines with higher power output and more than one turbocharger have a lower compression ratio. Every cylinder has two inlet and two outlet valves as well as two chain-driven overhead camshafts.