The BMW N63 is a twin-turbo V8 petrol engine which has been in production from 2008 to present. The N63 is the world's first production car engine to use a "hot-vee" layout, with the turbochargers located inside the "V" of the engine. It is also BMW's first turbocharged V8 engine. The N63 replaced the BMW N62 and was first used in the 2008 X6 xDrive50i. The [|S63] engine is the BMW M high-performance version of the N63. Alpina versions of the N63 are used in various F01 7 Series, F10 5 Series, G11 7 Series and G30 5 Series models.
Design
The airflow path through the engine uses a "hot-vee" layout, where the exhaust manifolds and turbochargers are located between the cylinder banks and the intake manifolds are located on the outside of the engine. This is opposite to the traditional layout for a V8, where the intake is inside the "V" and the exhaust manifold is on the outside. The hot-vee layout reduces the width of the engine and decreases the exhaust runner length from the exhaust valves to the turbochargers. The engine uses air-to-water intercoolers, therefore improving throttle response. Similar to the N54B30, initial N63 variants do not use Valvetronic,. Due to the presence of turbocharging, the N63 does not use a variable-length intake manifold. The N63 is BMW's first V8 engine to use direct injection. The N63/S63 uses a bore of and a stroke of .
2012 technical update
In 2012, a "Technical Update" was applied to the N63, resulting in the N63TU variants. The main upgrade was the addition of Valvetronic. Other changes include revised turbochargers, removal of the blowoff valve, lighter pistons, forged connecting rods and crankshaft, addition of a valve cover labyrinth oil catch/return system, new valve stem seals, revised fuel system and addition of a second coolant pump.
2016 technical update
A second Technical Update occurred in 2016, resulting in the N63TU2 variants. The major changes are the use of twin-scroll turbochargers, a wider powerband and the oil/coolant heat exchanger being moved to within the "V" of the engine.
2018 technical update
A third Technical Update was introduced in 2018. Two variants are offered: N63B44M3 and N63B44T3. N63B44M3 features improved thermal shielding for the crankcase and the cylinder head, and a new ignition system. In addition, N63B44T3 uses higher pressure injectors, larger twin-scroll turbochargers, a redesigned intake manifold, and an upstream cooling radiator.
Models
N63B40A
This smaller variant was sold in the Chinese market. Due to a shorter stroke length of, the capacity is reduced to. Applications:
The S63 is the BMW M version of the N63, which debuted in the BMW X6 M and was used in the BMW M5 models from 2011 to present. The S63 uses two twin-scroll turbochargers plus a pulse tuned, cross-engine exhaust manifold to keep constant exhaust pulses flowing to the turbos at every 180 degree rotation.
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 and 1.5 bar of boost. It is the first BMW M engine to use Valvetronic. The rev limit was increased from 6800 rpm to 7200 rpm. Applications:
uses a variant of the N63 engine, which was hand-assembled at the Alpina plant in Buchloe before being transported to the BMW production line. For the 2013 model year, the Alpina engine received Valvetronic like all other N63 engines.
In December 2014, BMW North America released a voluntary recall relating to issues with timing chain stretch, fuel injectors, mass air flow sensors, crankcase vent lines, battery, engine vacuum pump, low pressure fuel sensor and revising the oil service interval.
