BMW S14

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BMW S14
Overview
Manufacturer BMW
Production 1986-1990
Combustion chamber
Configuration DOHC straight-4
Chronology
Predecessor none
Successor BMW S50

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.[1] 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.[2]


Models[edit]

Engine Displacement Power Torque Redline Year
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

S14B20[edit]

This version was only sold in Portugal and Italy.[2] It has a 1990 cc capacity (achieved by shortening the stroke to 72.6 mm)[1] and produces 141 kW.[3]

Applications:

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

S14B23[edit]

The E30 M3 was initially released with the 147 kW S14B23.[4] Versions equipped with a catalytic convertor produced 143 kW (194 PS; 192 hp) and 230 Nm.[4]

Applications:

S14B23 EVO2[edit]

This update of the S14B23 produced 162 kW (220 PS; 217 hp), or 158 kW (215 PS; 212 hp) if equipped with a catalytic convertor.[4] Changes include a revised intake camshaft profile and modified exhaust camshaft timing, increased compression, and a more efficient cylinder head intake port design.[citation needed] Larger diameter exhaust header tubes are used.[citation needed]

Applications:

S14B25 EVO3[edit]

In 1989, the displacement was enlarged to 2467 cc and this engine produced 175 kW.[4] Higher lift intake and exhaust camshafts were used.[citation needed] Applications:

References[edit]

  1. ^ a b "BMW World - BMW S14 Engine". Usautoparts.net. Retrieved 2012-06-03. 
  2. ^ a b "FAQ E30 320is (S14)". BMW M Registry. Retrieved 2012-06-03. 
  3. ^ "Euro E30 320iS – Italian M3 | BMWE21.net – Jeroen's BMW E21 Network". Bmwe21.net. Retrieved 2012-06-03. 
  4. ^ a b c d "BMW Heaven Specification Database | Engine specifications for Motorsport engines". Bmwheaven.com. Retrieved 2012-06-03.