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BMW M44B19 specs: 1.9L (116 ci) 4-cylinder, 85 x 83.5 mm (3.3465 x 3.2874 in) bore and stroke, 10:1 compression. Rated 138 hp, 1996–1999.
The BMW M44B19 is close to square: 3.3465" bore against 3.2874" stroke, within 1.8%, which splits the difference between a high-revving layout and a torque layout. The 3.2874" stroke does not reach 4,000 ft/min of mean piston speed until about 7,300 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 29.0 ci (475 cc).
10:1 is in the range that usually runs on pump premium.
4 factory variants share these dimensions, rated at 138 hp across 1996–1999.
| Displacement | 116 ci / 1.9 L |
|---|---|
| Bore | 3.3465" |
| Stroke | 3.2874" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10:1 * |
| Bore/stroke ratio | 1.018 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 138 hp |
| Years | 1996–1999 |
| Bore/stroke character | 1.018 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,287 ft/min — conservative for a street engine |
| Displacement per cylinder | 29.0 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1996 | 138 hp | M44B19 |
| 1997 | 138 hp | M44B19 |
| 1998 | 138 hp | M44B19 |
| 1999 | 138 hp | M44B19 |
2 factory vehicles, 1996–1999. Each year opens that model's engine table.