BMW S14

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BMW S14
BMW S14 Engine.jpg
BMW S14 in an E30 M3
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 (192 PS) .[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 converter 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 converter.[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 (238 PS; 235 BHP). [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.