BMW S14

BMW S14
Overview
Production1986-1991
Layout
ConfigurationInline-4
Displacement2.0 L (1,990 cc)
2.3 L (2,302 cc)
2.5 L (2,467 cc)
Cylinder bore93.4 mm (3.68 in)
95 mm (3.74 in)
Piston stroke72.6 mm (2.86 in)
84 mm (3.31 in)
87 mm (3.43 in)
Cylinder block materialCast iron
Cylinder head materialAluminium
ValvetrainDOHC
Combustion
Fuel typePetrol
Chronology
PredecessorNone
SuccessorNone

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]

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
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 EVO2 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

[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. ^ a b "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. ^ a b "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. ^ a b c d "BMW Heaven Specification Database | Engine specifications for Motorsport engines". Bmwheaven.com. Retrieved 2012-06-03.
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