BMW S14#S14B23
{{Infobox automobile engine
|name = BMW S14
|image = BMW S14 Engine.jpg
|production = 1986-1991
|configuration = Inline-4
|block = Cast iron
|head = Aluminium
|valvetrain = DOHC
|fueltype = Petrol
|displacement = {{convert|1990|cc|L|1|order=flip|abbr=on}}
{{convert|2302|cc|L|1|order=flip|abbr=on}}
{{convert|2467|cc|L|1|order=flip|abbr=on}}
| bore = {{convert|93.4|mm|in|2|abbr=on}}
{{convert|95|mm|in|2|abbr=on}}
| stroke = {{convert|72.6|mm|in|2|abbr=on}}
{{convert|84|mm|in|2|abbr=on}}
{{convert|87|mm|in|2|abbr=on}}
|predecessor = None
|successor = None
}}
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.{{cite web |title=BMW S14B23 automotive engine |url=https://bmw-grouparchiv.de/research/detail/index.xhtml |website=bmw-grouparchiv.de |accessdate=17 June 2019}} 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.{{cite web|url=http://www.bmwmregistry.com/model_faq.php?id=10 |title=FAQ E30 320is (S14) |publisher=BMW M Registry |date= |accessdate=2012-06-03}}
Versions
| class=wikitable style="text-align: center;" | ||||
| Version | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| S14B20 | {{convert|1990|cc|cuin|1|abbr=on}} | {{convert|141|kW|bhp|0|abbr=on}} at 6,900 rpm | {{convert|210|Nm|lbft|0|abbr=on}} at 4,900 rpm | 1987-1990 |
| rowspan=3 align="center"| S14B23 | rowspan="4" align="center" |{{convert|2302|cc|cuin|1|abbr=on}} | align="center" |{{convert|143|kW|bhp|0|abbr=on}} at 6,750 rpm | align="center"|{{convert|230|Nm|lbft|0|abbr=on}} at 4,750 rpm | align="center"|1986–1989 |
| align="center"|{{convert|147|kW|bhp|0|abbr=on}} at 6,750 rpm | align="center"|{{convert|240|Nm|lbft|0|abbr=on}} at 4,750 rpm | align="center"|1986–1989 | ||
| align="center"|{{convert|158|kW|bhp|0|abbr=on}} at 6,750 rpm | align="center"|{{convert|230|Nm|lbft|0|abbr=on}} at 4,600 rpm | align="center"|1989–1991 | ||
| S14B23 EVO2 | {{convert|162|kW|bhp|0|abbr=on}} at 6,750 rpm | {{convert|245|Nm|lbft|0|abbr=on}} at 4,750 rpm | 1988-1990 | |
| S14B25 EVO3 | {{convert|2467|cc|cuin|1|abbr=on}} | {{convert|175|kW|bhp|0|abbr=on}} at 7,000 rpm | {{convert|240|Nm|lbft|0|abbr=on}} at 4,750 rpm | 1989-1990 |
{{cite web |title=M3 Vorstellung von 1986 Seite 13/32 |url=http://www.s14.ctmnet.de/0067/0067_13.htm |website=www.s14.ctmnet.de |accessdate=17 June 2019}}
S14B20
This version was only sold in Portugal and Italy. It has a displacement reduced to {{convert|1990|cc|cuin|1|abbr=on}} by shortening the stroke to {{convert|72.6|mm|in|1|abbr=on}}.{{cite web |title=BMW S14B20 automobile engine |url=https://bmw-grouparchiv.de/research/detail/index.xhtml?id=6399125 |website=bmw-grouparchiv.de |accessdate=17 June 2019}}{{cite web|url=http://www.bmwe21.net/?page_id=177 |title=Euro E30 320iS – Italian M3 | BMWE21.net – Jeroen's BMW E21 Network |publisher=Bmwe21.net |date= |accessdate=2012-06-03}}
Applications:
- 1987-1990 E30 320iS (Italy and Portugal only)
S14B23
The E30 M3 was initially released with the {{convert|147|kW|bhp|0|abbr=on}} S14B23 engine.{{cite web|url=http://www.bmwheaven.com/database/engine.php?type=Motorsport#/61 |title=BMW Heaven Specification Database | Engine specifications for Motorsport engines |publisher=Bmwheaven.com |date= |accessdate=2012-06-03}} Versions equipped with a catalytic converter produced {{convert|143|kW|bhp|0|abbr=on}} and 230 Nm. In April 1989, the Ravaglia and Cecotto limited edition M3s were released with a {{convert|158|kW|bhp|0|abbr=on}} S14B23 that would in September, 1989 become the standard motor for the E30 M3.{{cite web |title=BMW M Registry - FAQ E30 M3 |url=https://bmwmregistry.com/model_faq.php?id=8#3 |website=bmwmregistry.com |accessdate=17 June 2019}}
Applications:
- 1986-1991 E30 M3
S14B23 EVO2
This update of the S14B23 produced {{convert|162|kW|bhp|0|abbr=on}}, or {{convert|158|kW|bhp|0|abbr=on}} if equipped with a catalytic converter.
Applications:
- 1988-1990 E30 M3
S14B25 EVO3
In 1989, the displacement was enlarged to {{convert|2467|cc|L|1|abbr=on}} and this engine produced {{convert|175|kW|hp|0|abbr=on}}.
Applications:
- 1989-1990 E30 M3
See also
References
{{reflist|30em}}
{{BMW automotive petrol engines: 1960s to 1980s}}
{{commons category|BMW S14 engine}}