N63B44A Engine for BMW 5 Series, 6 Series, 7 Series, X5, and X6 (4.4L V8)
The BMW N63B44 is a 4.4-liter twin-turbocharged V8 engine that, depending on the production year and specific model, produces between 402 and 523 horsepower, and between 443 and 553 pound-feet of torque.
Description
General Specifications
Engine Type: 90° V8, Twin-Turbocharged
Displacement: 4,395 cc (4.4 L)
Bore × Stroke: 89 mm × 88.3 mm
Block/Head Material: Aluminum-Silicon Alloy (Alusil)
Valvetrain: DOHC, 32 Valves, Double VANOS, Valvetronic
Compression Ratio: 10.0:1 to 10.5:1
Dry Weight: Approx. 503 lbs
