BMW N63

The BMW N63 is a twin turbo DOHC V8 piston engine which replaced the (naturally aspirated) N62 and was produced from 2008–present. It was launched in the 2008 BMW X6 xDrive50i,^[1] and later the F01 BMW 750i.^[2] The location of the intake and exhaust manifolds are reversed compared to a traditional V8. The BMW Motorsport division version of this engine, called S63, debuted in the X5M and X6M and later appeared in the M5 and M6. Alpina also uses a variant of this engine on the 2011 Alpina B7 and B5.

Design

The exhaust manifolds and turbochargers are located between the banks of cylinders (i.e. on the "inside" of the V8) and the intake manifolds are located on the outside of the engine;^[3] this is the opposite of the traditional manifold arrangement for a V8. This new design creates a more compact engine package and reduces the width of the assembled engine, also decreasing the distance from the exhaust manifolds to the turbochargers.^[4] The engine uses air-to-water intercoolers, which are more efficient and provide a shorter air path than standard air-to-air intercoolers.^[1]

Similar to the N54B30, the original N63B44 and S63 do not use the second generation Valvetronic technology found in other current engines. The principal advantage of Valvetronic is the reduction of intake vacuum, which is not an issue in the pressurized intake found in a turbo-charged engine. Valvetronic was added to updated variants of the engine for the 2012 BMW M5/M6 (S63TU) and then for the 2013 BMW 750i and 650i Gran Coupe.

In terms of performance, the N63 is a close match to the N73 V12 engine found in the previous-generation E65 760i/Li, so the V12 engine had to be redesigned with twin turbochargers for the F01 760i/Li in order to maintain its status as the flagship of the range.^[5]

Models

N63B44O0

Applications:

• 2008– E71 X6 xDrive50i
• 2009– F01/F02 750i/750Li sDrive/xDrive
• 2010– F07 550i GT sDrive/xDrive
• 2011– F10/F11 550i sDrive/xDrive
• 2011– E70 X5 xDrive50i
• 2012– F12/F13 650i sDrive/xDrive

S63

The S63 engine

The S63 is BMW's Motorsport division version of the N63, which is debuted in the BMW X6M. The S63 uses two twin-scroll turbochargers plus a pulse tuned, cross-engine exhaust manifold^[3] to keep constant exhaust pulses flowing to the turbos at every 180 degree rotation.

S63B44O0

Applications:

• 2010– E70 X5 M
• 2010– E71 X6 M
• 2011 Wiesmann GT MF5

S63B44T0

A technical update to the S63, known as the S63B44T0, debuted on the F10 M5 sedan. This version uses valvetronic, a 10:1 compression ratio (compared with 9.3:1 for the non-TU version) and 1.5 bar of boost (compared with 1.3).^[6] It is the first BMW M to use valvetronic.

Applications:

• 2011–present F10 M5
• 2012–present F12/13 M6
• 2013–present F06 M6 Gran Coupe

Alpina

Alpina uses a variant of the N63 engine that makes 25% more power than the base engine. Compared to the S63, Alpina's variant makes lower horsepower but more torque.

For the 2013 model year, it received Valvetronic like all other N63 engines. Compared to BMW M's version of the 4.4L twin-turbo engine (such as found in the F10 BMW M5), Alpina's engine has 20 hp less but more maximum torque which is also available at a lower RPM.^[7]

• ALPINA B5 Bi-Turbo Sedan/Touring: based on the BMW F10/F11 5 Series - featuring a 4.4 L V8 Bi-Turbo engine 507 PS (373 kW; 500 hp) / 700 N·m (516 lb·ft)
• ALPINA B7 Bi-Turbo: based on the BMW F01 7 Series - featuring a 4.4 L V8 Bi-Turbo engine 507 PS (373 kW; 500 hp) / 700 N·m (516 lb·ft)^[8][9]

References

External links

• http://www.5seriesblog.com/2012/04/29/how-to-disable-bmw-m5-active-sound-technology/
• http://f10.m5post.com/forums/showthread.php?t=588858