| BMW S14 | |
| Production: | 1986-1991 |
| Configuration: | Inline-4 |
| Block: | Cast iron |
| Head: | Aluminium |
| Valvetrain: | DOHC |
| Fueltype: | Petrol |
| Displacement: | 1990cc 2302cc 2467cc |
| Bore: | 93.42NaN2 952NaN2 |
| Stroke: | 72.62NaN2 842NaN2 872NaN2 |
| Predecessor: | None |
| Successor: | None |
The BMW S14 is a DOHC four-cylinder petrol engine which was used in the E30 M3, E30 320iS, and E36 318i Super Touring. It is based on the BMW M10 block and what is essentially a shortened BMW S38 cylinder head.[1] The direct successor to the S14 was the S42 based on the M42 engine. The S42 was a racing engine installed in the E36 320i for the German Super Tourenwagen Cup. There is no direct successor to the S14 for production BMWs, since the following generation of M3 is powered by the BMW S50 six-cylinder engine.
Two separate throttle bodies are used, each incorporating two throttle butterfly plates.[2]
| Version | Displacement | Power | Torque | Year | |
|---|---|---|---|---|---|
| S14B20 | 19901NaN1 | 1410NaN0 at 6,900 rpm | 2100NaN0 at 4,900 rpm | 1987-1990 | |
| 23021NaN1 | 1430NaN0 at 6,750 rpm | 2300NaN0 at 4,750 rpm | 1986–1989 | ||
| 1470NaN0 at 6,750 rpm | 2400NaN0 at 4,750 rpm | 1986–1989 | |||
| 1580NaN0 at 6,750 rpm | 2300NaN0 at 4,600 rpm | 1989–1991 | |||
| S14B23 EVO2 | 1620NaN0 at 6,750 rpm | 2450NaN0 at 4,750 rpm | 1988-1990 | ||
| S14B25 EVO3 | 24671NaN1 | 1750NaN0 at 7,000 rpm | 2400NaN0 at 4,750 rpm | 1989-1990 |
This version was only sold in Portugal and Italy.[2] It has a displacement reduced to 19901NaN1 by shortening the stroke to 72.61NaN1.[4] [5]
Applications:
The E30 M3 was initially released with the 1470NaN0 S14B23 engine.[6] Versions equipped with a catalytic converter produced 1430NaN0 and 230 Nm. In April 1989, the Ravaglia and Cecotto limited edition M3s were released with a 1580NaN0 S14B23 that would in September, 1989 become the standard motor for the E30 M3.[7]
Applications:
This update of the S14B23 produced 1620NaN0, or 1580NaN0 if equipped with a catalytic converter.
Applications:
In 1989, the displacement was enlarged to 24671NaN1 and this engine produced 1750NaN0.
Applications: