BMW N52 engine

The BMW N52 is the BMW's latest straight-6 engine, which debuted in 2004 on the BMW E63 630Ci. Its crankcase is made entirely of magnesium-aluminum, a first in the world of engine construction. It is the lightest production engine of its size class in the world, at 161kg/354lbs.

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 63kW (85.5hp) per liter of displacement, it has the lowest weight per horsepower of any six cylinder engine (1.24hp 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 only exception being the X5 which still uses the predecessor, M54B30 as its 3.0 Liter gasoline engine option.

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


Models

Engine
N52B25

Displacement
2.5 L (2497 ccm/152 in³)

Power
130 kW (174 hp) @ 5800
160 kW (215 hp) @ 6500

Torque
230 N·m (170 ft·lbf) @ 3500-5000
250 N·m (184 ft·lbf) @ 2750-425

Redline
7000rpm

Year
2005



Engine
N52B30

Displacement
3.0 L (2996 ccm/182 in³)

Power
190 kW (255 hp) @ 6600
195 kW (265 hp) @ 6600
200 kW (272 hp) @ 6650

Torque
300 N·m (221 ft·lbf) @ 2500-4000
315 N·m (232 ft·lbf) @ 2750-4250
315 N·m (232 ft·lbf) @ 2750-4250

Redline
7000rpm

Year
2004
2005
2006



N52B25

The N52B25 comes in two versions, both displacing 2.5 L (2497 ccm/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 (215 hp) at 6500 rpm and 250 N·m (184 ft·lbf) at 2750-4250 rpm.

Applications:

* 130 kW (174 hp) and 230 N·m (170 ft·lbf)
o E60/E61 523i (Not in the US market) Sedan and Touring
o E90 323i (US market only) Sedan
* 160 kW (215 hp) and 250 N·m (184 ft·lbf)
o E60/E61 525i/525xi Sedan and Touring
o E90/E91/E92/E93 325i/325xi Sedan, Touring, Coupè and Convertible
o E83 X3 2.5si (Not in the US market) Sports Activity Vehicle
o E85 Z4 2.5si (Not in the US market) Roadster


N52B30

The N52B30 comes in three versions, all displacing 3.0 L (2996 ccm/182 in³) and produces variable outputs depending on the BMW model that it comes with (with changes to the variable resonance system-omitted, dual plenum runner system-also omitted and variable back pressure muffler-omitted) 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 190kW versions on the E90/E60 in Late 2006 and has first been released on the new E92 330i Coupè. It will produce 200 kW (272 hp) at 6650 and 315 N·m (232 ft·lbf) at 2750-4250 rpm.

Applications:

* 190 kW (255 hp) and 300 N·m (221 ft·lbf)
o E60/E61 530i/530xi Sedan and Touring (*)
o E63/E64 630i (Not in the US market) Luxury Coupè and Convertible
o E65/E66 730i/730Li (Not in the US market) Luxury Sedan
o E90/E91 325i, 328i, 330i Sedan, Touring (*)

The models marked with a star (*) will soon receive the 200kW version upgrade - sometime in late 2006.

* 195 kW (265 hp) and 315 N·m (232 ft·lbf)
o E85/E86 Z4 3.0i and 3.0si Roadster and Coupè
o E87 130i (Not in the US market) Hatchback
* 200 kW (272 hp) and 315 N·m (232 ft·lbf)
o E92/E93 328i/328xi Coupè, 4WD Coupè and the upcoming Hardtop Convertible
o E83 X3 3.0si Sports Activity Vehicle