BMW N63
| BMW N63 engine | |
|---|---|
| Overview | |
| Manufacturer | BMW, Bayerische Motoren Werke AG |
| Production | 2008- |
| Combustion chamber | |
| Configuration | 90° V8 |
| Chronology | |
| Predecessor | BMW N62 |
The BMW N63 is a twin turbo DOHC V8 piston engine which replaced the (naturally aspirated) N62 and has been produced from 2008–present. It was launched in the 2008 BMW X6 xDrive50i, and later the F01 BMW 750i. 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 in its B5 Bi-Turbo, B6 Bi-Turbo and B7 Bi-Turbo.
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; 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. The engine uses air-to-water intercoolers, which are more efficient and provide a shorter air path than standard air-to-air intercoolers.
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.
Applications:
The N63TU engine is the successor to the N63. The further developed N63TU engine is the latest fuel-mixture generation technology Turbo Valvetronic Direct Injection TVDI. There are strong similarities here to the N20 or N55 engines. The new engine boasts better performance data at reduced fuel consumption and CO2 emissions.
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