[1] The N62 is the world's first engine to use a continuously variable-length intake manifold,[2] and BMW's first V8 to feature variable valve lift (called Valvetronic).

The N62 4.4L has a bore of 92 mm (3.6 in) and stroke of 82.7 mm (3.26 in) for a total displacement of 4,398cc and features double-VANOS variable valve timing on both the intake and exhaust camshafts (the M62 features variable valve timing on only the intake camshaft).

The engine does feature a throttle body but this is only used for emergency applications in the event of Valvetronic failure, for certain cold start conditions and to maintain a set amount of vacuum in the intake during low load conditions such as cruising on the highway or idling.

The oil pan was modified and deepened to account for the longer stroke crankshaft, this change was applied to all N62's in October 2003 which includes the 4.4 variants in production at the time.

Other changes were also made to accommodate the longer stroke crankshaft such as more traditional non-offset connecting rods.

[9] The N62TU featured several changes over the N62B44, including different exhaust manifolds, improved catalytic converters, new pre-cat oxygen sensors, new MAF, updated engine management unit, replacement of the DIVA continuously variable length intake manifold to a DISA two-stage manifold, removal of secondary air injection ports and different heads to accomdate this change and the increased bore, different spark plugs and inlet and exhaust valves with a stem diameter decreased to 5mm from 6mm.

The H1 is based on an N62B44 block with a forged crankshaft from Alpina, high strength Mahle pistons and the addition of an ASA centrifugal supercharger.