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, 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 on its B5 BiTurbo, B6 BiTurbo and B7 BiTurbo.

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; 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.