Prince engine

Prince engine

Infobox Automobile engine
name=BMW/PSA Prince engine
PSA Group
predecessor=Tritec engine
PSA TU engine

Prince is the codename for a family of modern automobile straight-4 engines developed jointly by BMW and PSA Peugeot Citroën. It is a compact engine family of 1.4–1.6 L in displacement and includes most modern features including gasoline direct injection and variable valve timing.

For BMW, the engines replaces the BMW/Chrysler Tritec engine family in the MINI. PSA has started to use the Prince family in place of their TU family — the Peugeot 207 being the first car to receive it.

The engines’ components will be produced by PSA at their Douvrin, France, facility, with MINI engine construction at Hams Hall in Birmingham, England. The joint venture was announced on July 23, 2002 with the first engines produced in 2005. The Prince engine project is not related to the Prince Motor Company.

In late 2006, an extension of the cooperation between the two groups was announced [ the press release is here : [] Fr icon ] , promising new four cylinder engines, without further details.


The Prince family shares only its basic block dimensions with the previous PSA TU engine family. Much of the advanced engineering was provided by BMW, including their Valvetronic variable valve lift system on the intake side. Other advanced features include on-demand oil and water pumps. Gasoline direct injection with a twin-scroll turbocharger will be optional. []

All Prince engines will share 84 mm (3.3 in) cylinder spacing and a 77 mm (3 in) bore. The engine features a two-piece "bedplate" aluminum crankcase for extra stiffness.


The 1.4 L PSA ET3 is the smallest member of the Prince family with a stroke measuring 75 mm (2.9 in) and total capacity of 1360 cc. Depending on application, power output varies from 90 PS to 95 PS while torque can range between 100–103 ft·lbf (136–140 N·m).

* 2004–present Citroen C4
* 2006–present Peugeot 207
* 2006–present Peugeot 307
* 2007–present MINI One
* 2007–present Peugeot 308


The 1.6 L engine is used in the second-generation MINI and various Peugeot 207 models. It has a 85.8 mm (3.4 in) stroke for a total of 1598 cc of displacement.


The naturally-aspirated variant (EP6) has conventional fuel injection and lost-foam cast heads. Its high 11:1 compression ratio creates an output of 120 PS (118 hp/88 kW) at 6000 rpm with a redline of 6500 rpm. Torque is 118 ft·lbf (160 N·m) at 4250 rpm.cite web|url=|title=2007 Mini Preview - Press Release|accessdate=August 15|accessyear=2006]

* 2006–present Peugeot 207 Sport
* 2007–present MINI Cooper


The turbocharged 1.6 L unit adds gasoline direct injection and has special low-pressure die-cast heads.

At this stage, there are two versions on offer - the THP150 and THP175, also known as the EP6DT and EP6DTS respectively within Peugeot.

For the THP150 maximum torque is 177 ft·lbf (240 N·m) at 1400 rpm, remaining flat to 5000 rpm. Power output is 150 PS (148 hp/110 kW) at 5500 rpm.

* 2006–present Peugeot 207 CC/GT
* 2007–present Peugeot 308

For the THP175 maximum torque is 178 ft·lbf (247 N·m) at 1600 rpm, remaining flat to 5000 rpm. Power output is 175 PS (173 hp/128 kW) at 5500 rpm. An overboost function is available which temporarily increases torque to 192 ft·lbf (260 N·m) between 1700 rpm and 4500 rpm.

* 2006–present Peugeot 207 RC
* 2007–present MINI Cooper S




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