BMW S14

The BMW S14 is a DOHC four-cylinder petrol engine which was used in the E30 M3 and E30 320iS. It is based on the BMW M10 block and the cylinder head from the six-cylinder BMW S38 with two cylinders removed.[1] There is no direct successor to the S14, since the following generation of M3 is powered by the BMW S50 six-cylinder engine.

BMW S14
Overview
Production1986-1991
Layout
ConfigurationInline-4
Displacement2.0–2.5 L (122–153 cu in)
Block materialCast iron
Head materialAluminium
ValvetrainDOHC
Combustion
Fuel typePetrol
Chronology
PredecessorNone
SuccessorNone

Two separate throttle bodies are used, each incorporating two throttle butterfly plates.[2]

Versions
VersionDisplacementPowerTorqueYear
S14B201,990 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
S14B232,302 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
147 kW (197 bhp)
at 6,750 rpm		240 N⋅m (177 lb⋅ft)
at 4,750 rpm		1986–1989
158 kW (212 bhp)
at 6,750 rpm		230 N⋅m (170 lb⋅ft)
at 4,600 rpm		1989–1991
S14B23 EVO2162 kW (217 bhp)
at 6,750 rpm		245 N⋅m (181 lb⋅ft)
at 4,750 rpm		1988-1990
S14B25 EVO32,467 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

[3][4]

S14B20

This version was only sold in Portugal and Italy.[2] It has a displacement reduced to 1,990 cc (121.4 cu in) by shortening the stroke to 72.6 mm (2.9 in).[5][6]

Applications:

  • 1987-1990 E30 320iS (Italy and Portugal only)

S14B23

The E30 M3 was initially released with the 147 kW (197 bhp) S14B23 engine.[7] Versions equipped with a catalytic converter produced 143 kW (192 bhp) and 230 Nm.[7] In April 1989, the Ravaglia and Cecotto limited edition M3s were released with a 158 kW (212 bhp) S14B23 that would in September, 1989 become the standard motor for the E30 M3.[4]

Applications:

S14B23 EVO2

This update of the S14B23 produced 162 kW (217 bhp), or 158 kW (212 bhp) if equipped with a catalytic converter.[7]

Applications:

S14B25 EVO3

In 1989, the displacement was enlarged to 2,467 cc (2.5 L) and this engine produced 175 kW (235 hp).[7]

Applications:

See also

References
  1. "BMW S14B23 automotive engine". bmw-grouparchiv.de. Retrieved 17 June 2019.
  2. "FAQ E30 320is (S14)". BMW M Registry. Retrieved 2012-06-03.
  3. "M3 Vorstellung von 1986 Seite 13/32". www.s14.ctmnet.de. Retrieved 17 June 2019.
  4. "BMW M Registry - FAQ E30 M3". bmwmregistry.com. Retrieved 17 June 2019.
  5. "BMW S14B20 automobile engine". bmw-grouparchiv.de. Retrieved 17 June 2019.
  6. "Euro E30 320iS – Italian M3 | BMWE21.net – Jeroen's BMW E21 Network". Bmwe21.net. Retrieved 2012-06-03.
  7. "BMW Heaven Specification Database | Engine specifications for Motorsport engines". Bmwheaven.com. Retrieved 2012-06-03.
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