Technical training manual covering the BMW S55 engine’s design, components, specifications and service procedures.
This manual provides comprehensive technical training for the BMW S55 engine used in the M3 and M4 models. It covers the engine’s history, identification, mechanical construction, valvetrain, belt drive, oil, intake, exhaust, vacuum, fuel, cooling and electrical systems, as well as service information and repair guidelines.
The document includes detailed diagrams, technical data tables, and safety instructions intended for trainers and participants in BMW Group technical seminars. It is focused on the European left‑hand‑drive version of the engine but notes differences for other market specifications.
| Displacement | 3,999 cm³ |
|---|---|
| Bore / Stroke | 92 mm / 75.2 mm |
| Compression ratio | 12 : 1 |
| Engine weight | 212 kg (467 lb) |
| Maximum speed | 250 km/h (155 mph) |
The S55 engine has a displacement of 3,999 cm³.
The compression ratio is 12 : 1.