BMW automotive engine families listed as S14. Specifications below retain the source's separate family and variant labels.
Family specifications
BMW S14
| Field | Reported value |
|---|---|
| Production | 1986-1991 |
| Configuration | Inline-4 |
| Displacement | 2.0 L (1,990 cc) 2.3 L (2,302 cc) 2.5 L (2,467 cc) |
| Cylinder bore | 93.4 mm (3.68 in) 95 mm (3.74 in) |
| Piston stroke | 72.6 mm (2.86 in) 84 mm (3.31 in) 87 mm (3.43 in) |
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminium |
| Valvetrain | DOHC |
| Fuel type | Petrol |
| Predecessor | None |
| Successor | None |
Variant specifications
Versions
| Version | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| S14B20 | 1,990 cc (121.4 cu in) | 141 kW (189 bhp) at 6,900 rpm | 210 N⋅m (155 lb⋅ft) at 4,900 rpm | 1987-1990 |
| S14B23 | 2,302 cc (140.5 cu in) | 143 kW (192 bhp) at 6,750 rpm | 230 N⋅m (170 lb⋅ft) at 4,750 rpm | 1986–1989 |
| S14B23 | 2,302 cc (140.5 cu in) | 147 kW (197 bhp) at 6,750 rpm | 240 N⋅m (177 lb⋅ft) at 4,750 rpm | 1986–1989 |
| S14B23 | 2,302 cc (140.5 cu in) | 158 kW (212 bhp) at 6,750 rpm | 230 N⋅m (170 lb⋅ft) at 4,600 rpm | 1989–1991 |
| S14B23 EVO2 | 2,302 cc (140.5 cu in) | 162 kW (217 bhp) at 6,750 rpm | 245 N⋅m (181 lb⋅ft) at 4,750 rpm | 1988-1990 |
| S14B25 EVO3 | 2,467 cc (150.5 cu in) | 175 kW (235 bhp) at 7,000 rpm | 240 N⋅m (177 lb⋅ft) at 4,750 rpm | 1989-1990 |
BMW automotive engine directory
Design, development and variant notes
The S14 combines an M10-derived block with a four-cylinder head related to the S38 design. Its intake uses two throttle-body assemblies, each containing two butterflies.
The 1,990 cc S14B20 was intended for displacement-sensitive Italian and Portuguese markets. The S14B23 had several output and emissions configurations; the later S14B25 Evo 3 grew to 2,467 cc.
Data adapted from the cited Wikipedia revision by Wikipedia contributors under CC BY-SA 4.0. Production dates and fitments reflect that revision; verify the exact engine code, market and vehicle before applying a specification.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
- Wikipedia: List of BMW engines. Wikipedia contributors; CC BY-SA 4.0. Source revision oldid 1382309748; accessed 2026-11-10.
- Wikipedia: BMW S14. Wikipedia contributors; CC BY-SA 4.0. Source revision oldid 1378732100; accessed 2026-11-10.
Further Wikipedia-sourced details
The following additional information is drawn from the cited Wikipedia revision by Wikipedia contributors, available under CC BY-SA 4.0. An open-ended date reflects the source snapshot, not confirmed current production or fitment.
Additional recorded applications
| Source version or rating | Vehicle application as recorded |
|---|---|
| S14B20 | 1987-1990 E30 320iS (Italy and Portugal only) |
| S14B23 | 1986-1991 E30 M3 |
| S14B23 EVO2 | 1988-1990 E30 M3 |
| S14B25 EVO3 | 1989-1990 E30 M3 |