5 Series E60 M5 (S85) SAL
Brief description of components
The following components which are activated mechanically and electrically are described:
-
Engine block
The S85B50, a 90
°
V engine, is extremely compact. The 90
°
angle produces a vibration- and comfort-oriented
balancing of masses.
The very high maximum speed of 8,250 rpm means that an extremely rigid engine block is required.
The necessary torsional strength is provided by a bedplate construction.
With the bedplate construction, the crankcase is split. In a split crankcase, the crankshaft bearings are part of a
separate stable frame: the "bedplate".
A liquid sealing compound which is injected into a groove forms a seal to the crankcase.
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Light alloy crankcase without cylinder bushes
The crankcase is made from an alloy containing aluminium and silicon.
The cylinder barrel is formed using exposed, hard silicon crystals. This means that additional cylinder bushes
are not required. The iron-coated pistons run directly into this unlined bore hole.
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Single-part light alloy cylinder head
The cylinder head has been made from one piece.
The idle air and secondary air channels are integrated into the cylinder head.
This reduces sealing surfaces and also increases rigidity.
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Weight-optimised crankshaft drive
The crankshaft is relatively short due to the cylinder spacing of 98 mm. This achieves a high bending resistance
and torsional strength combined with low weight. Both inlet camshaft drive sprockets are integrated into the
crankshaft.
The weight of the cracked connecting rods made of high high-tensile steel has been optimised which further
reduces the masses to be displaced.
The pistons are made of aluminium alloy and are coated with iron. One piston including piston pins and rings
weighs only around 480 grammes.
-
Weight-optimised valve gear
The camshaft is hollow-cast. The camshaft sensor gear for each camshaft sensor is integrated into the
camshaft.
The inlet valves are extremely light. The valve shaft is only 5 mm thick to achieve an optimum flow cross section.
The bucket tappets with hydraulic valve clearance adjustment are box-shaped and spherical. Reason: less
weight and reduced friction.
Anti-twist locks are mounted on the bucket tappets.
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Collector for intake air
The S85B50 has an intake manifold on each cylinder bank. The intake manifolds are connected to the air intake
filters by short hoses. The intake manifold is mounted on the throttle valve assembly with anti-twist hose clamps.
The air is drawn in via 2 air inlets in the grille and bumper (a total of 4 air inlets to air intake filter).
A cyclone filter is integrated into each intake manifold. The oil from the crankcase ventilation system is
separated then drained off into the oil sump.
The condensation which forms in the intake manifold is drained off via a line in the crankcase.
[more ...]
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2 throttle valve positioners and 2 throttle valve sensors
The S85B50 has 10 individual throttle butterflies.
SBT S85B50 engine E60, E61 M5 E63, E64 M6
BMW AG - TIS
23.02.2013 19:29
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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