BMW S14 DOHC straight-4 Petrol Engine
From 1986 To 1990
The BMW S14 is a straight-4 DOHC piston engine which was used in the E30 M3. It is based on the M10 block and the M88 head with two cylinders removed. The successor to the S14 is the S50 six-cylinder engine (since it was used in the following M3).
Two separate throttle bodies are used, each incorporating two throttle butterfly plates.
|S14B20||1990 cc||141 kW (192 PS; 189 hp) @ 6900||210 N·m (155 lb·ft) @ 4900||7300||1987-1990|
|S14B23||2303 cc||147 kW (200 PS; 197 hp) @ 6750||240 N·m (177 lb·ft) @ 4750||1986-1990|
|S14B23 EVO2||2302 cc||162 kW (220 PS; 217 hp) @ 6750||245 N·m (181 lb·ft) @ 4750||1988-1990|
|S14B25 EVO3||2467 cc||175 kW (238 PS; 235 hp) @ 7000||240 N·m (177 lb·ft) @ 4750||1989-1990|
This version was only sold in Portugal and Italy. It has a 1990 cc capacity (achieved by shortening the stroke to 72.6 mm) and produces 141 kW (192 PS) .
- 1987-1990 E30 320iS (Italy and Portugal only)
The E30 M3 was initially released with the 147 kW S14B23. Versions equipped with a catalytic converter produced 143 kW (194 PS; 192 hp) and 230 Nm.
- 1986-1990 E30 M3
This update of the S14B23 produced 162 kW (220 PS; 217 hp), or 158 kW (215 PS; 212 hp) if equipped with a catalytic converter. Changes include a revised intake camshaft profile and modified exhaust camshaft timing, increased compression, and a more efficient cylinder head intake port design.Larger diameter exhaust header tubes are used.
- 1988-1990 E30 M3
In 1989, the displacement was enlarged to 2467 cc and this engine produced 175 kW (238 PS; 235 BHP). Higher lift intake and exhaust camshafts were used.
- 1989-1990 E30 M3