Radiated noise minimization in engine block design, including use of a die - cast
aluminum bedplate instead of separate caps.
The M5 engine is made of aluminum,
with bedplate construction for the lower portion of the cylinder block.
This impressively low weight is down to extensive use of magnesium alloy composite - the block and cylinder head are made of the magical stuff, as is the
engine bedplate that sits below the block and adds additional strength to the whole structure.
NDA - Farmington Hills features the longest clay
modeling bedplate in the automotive industry.
A total of eight scavenger pumps suck oil out of the
lower bedplate fastened to the crankcase.
The Quadrajet diesel engine features a Variable Geometry Turbocharger for smoother running and an aluminum
bedplate along with superior insulation that reduces NVH levels while delivering a superior power to weight ratio.
An aluminum
bedplate design at the engine bottom end uses cast - iron crankshaft bearing cap inserts that are cross-bolted.
Other improvements include inverted - tooth chain driving the camshaft, forged steel crankshaft, cast
aluminum bedplate with main bearing cap inserts made of iron, high - pressure fuel rail with rubber - isolated assembly, acoustically shielded plastic cover for the intake manifold, and structurally enhanced aluminum camshaft cover and front cover.
Like the N52's, the N54 block is a completely new construction,
with bedplate.
The ceiling above
the bedplate is made of an artificial white high - tech fabric called Barrisol, which was heated, stretched and fitted to a grid of box frames that encase 585 color - corrected fluorescent tubes.
A bedplate — a frame for the crankshaft bearing bridges — further enhances its rigidity.
The high pressure, die - cast aluminum
bedplate, with cast iron inserts to carry the crankshaft, also provides cross-bracing to further increase block rigidity and reduce noise.
The engine uses a broached press - fit between the cylinder block and
the bedplate instead of dowels, in order to optimize the main bearing shape as well as its positional accuracy.
This is a first for Opel diesel engines and, combined with an aluminum
bedplate and cylinder head, saves more than 20 kilograms (44 lbs) in weight.
Cast iron was selected as the preferred material for the cylinder block in combination with an aluminum
bedplate.
For mass reduction the midsize gasoline engine features a two - piece crankcase design, supported at the lower end by a die - cast aluminum
bedplate.
The crankcase is
a bedplate construction.
Joining
the bedplate at the level of the crankshaft (main) bearings, this too is a weight - saving casting.