BMW N52

BMW N52 engine

N52B30 from an E87 130i M Sport (195 kW/315 Nm)
Manufacturer	BMW, Bayerische Motoren Werke AG
Production	2004–
Predecessor	BMW M54
Successor	BMW N53(in European markets)
Class	Straight-6

The BMW N52 is BMW's latest straight-6 engine, which debuted in 2004 on the BMW E63 630Ci. Its crankcase is made entirely of magnesium and aluminum, a first in the world of engine construction. BMW used Alusil aluminum cylinder sleeves, which offer high heat conductivity, and cast them into a lightweight magnesium block ^[1], creating one of the lightest production engines of its size class in the world at 161 kg (354 lb).

It includes BMW's second generation Valvetronic system and Double-VANOS for fuel-efficiency (12% fuel savings over the previous generation BMW M54 engine - and increases performance). Producing 63 kW (85.5 hp) per liter of displacement, it has the lowest weight per horsepower of any six cylinder engine (1.24 hp per kilogram with the latest version). It is the world’s lightest six-cylinder engine.

It was awarded as one of Ward's 10 Best Engines of the Year in 2006 and 2007. Technologically it is even more advanced than the new N54B30 bi-turbo, which is based on an older M54B30 design and lacks several improvements that BMW has made for this engine.

All BMWs are available with this engine in at least one version.

The N52 is BMW's 12th generation production straight-6 engine.

N52B25

N52B25 from a BMW 325 Coupé

The N52B25 comes in two versions, both displacing 2.5 L (2497 cc/152 in³). The first produces 130 kW (174 hp) at 5800 rpm and 230 N·m (170 ft·lbf) at 3500-5000 rpm while the more powerful version is rated at 160 kW (218 hp) at 6500 rpm and 250 N·m (184 ft·lbf) at 2750-4250 rpm.

Applications:

• 130 kW (177PS/174 hp) and 230 N·m (170 ft·lbf)
  • E60/E61 523i (Not in the US market) Sedan and Touring
  • E90 323i (Not in the US market) Sedan
• 160 kW (218PS/215 hp) and 250 N·m (184 ft·lbf)
  • E83 X3 2.5si (Not in the US market) Sports Activity Vehicle
  • E85 Z4 2.5si (Not in the US market) Roadster
  • E89 Z4 sDrive23i (150 kW/204 hp) (EUR)
  • E60/E61 525i Sedan and Touring (US)
• 160 kW (218PS/215 hp) and 270 N·m (199 ft·lbf)
  • E90/E91/E92/E93 325i (2006-2007 model years)

N52B30

N52B30 from a BMW Z4 3.0si

The N52B30 is available in three versions, all displacing 3.0 L (2996 cc/182 in³). However, each version produces variable maximum output depending upon the application. With a common engine displacement, the output changes result from the omission of the variable resonance system, dual plenum intake runner system, and the variable back pressure muffler: 190 kW (255 hp) at 6600 and 300 N·m (221 ft·lbf) at 2500-4000 rpm is the first and most produced version, while the second one is more powerful at 195 kW (265 hp) at 6600 and 315 N·m (232 ft·lbf) at 2750-4250 rpm. The third version is just starting to replace the first 190 kW versions on the E90/E60 in Late 2006 and has first been released on the new E92 330i Coupé. It will produce 200 kW (272 hp) at 6650 and 315 N·m (232 ft·lbf) at 2750-4250 rpm.

Applications in the European Market (taken from BMW website 07/10/07):

• 200 kW (272 PS,268 hp) @ 6700 rpm and 320 N•m @ 2750 rpm
  • E90/E92/E93 330i/330Ci Sedan, Coupé and Hardtop Convertible
  • E60/E61 530i Sedan and Touring

NB: All X30i models will soon receive this version of the N52B30 engine.

• 200 kW (272 PS,268 hp) @ 6650 rpm and 315 N•m @ 2750 rpm
  • E83 X3 3.0si Sports Activity Vehicle
  • E70 X5 3.0si Sports Activity Vehicle
• 195 kW (265 PS,262 hp) @ 6650 rpm and 315 N•m @ 2750 rpm
  • E85/E86 Z4 3.0si Roadster and Coupé
  • E87 130i Hatchback
• 190 kW (258 PS,255 hp) @ 6600 rpm and 300 N•m @ 2500 rpm
  • E89 Z4 sDrive30i (190 kW/258 PS) (EUR)
  • E63/E64 630i Sedan
  • E65/E66 730i Sedan
• 160 kW (218 PS,215 hp) @ 6200 rpm and 270 N•m @ 2500 rpm
  • E82/E88 125i Coupé and Cabriolet
  • E90/E91/E92/E93 325i (2008 model year onwards)

Applications in the US Market (taken from BMWUSA website 07/10/07):

• 260 hp (195 kW) @ 6600 rpm and 225 ft·lbf (305 N·m) @ 2750 rpm
  • E83 X3 3.0si Sports Activity Vehicle
  • E70 X5 3.0si Sports Activity Vehicle
• 255 hp (190 kW) @ 6600 rpm and 220 ft·lbf (300 N·m) @ 2750 rpm
  • E90 330i Sedan
  • E85/E86 Z4 3.0si Roadster and Coupé
• 230 hp (172 kW) @ 6500 rpm and 200 ft·lbf (271 N·m) @ 2750 rpm
  • E90/E92/E93 328i/328xi Sedan, Coupé, (inc 4WD versions) and the Hardtop Convertible
  • E60/E61 528i/528xi Sedan and Touring (inc 4WD versions)
  • E82 128i Coupé
• 215 hp (160 kW) @ 6250 rpm and 185 ft·lbf (250 N·m) @ 2750 rpm
  • E90/E91/E92/E93 325i/325xi Sedan, Touring, Coupé and Convertible
  • E85 Z4 3.0i Roadster

See also

• BMW engines
• BMW vehicles

References

External links

• WorldCarFans.com - BMW's New Six-Cylinder Engines - In Depth