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Introduction

S85B50 Engine

Introduction

The S85B50 is the first 10-cylinder engine

from BMW for series production vehicles. The

high speed layout of the S85 is a guarantee for

a high degree of spontaneity in engine

response and uniform power development.

Due to the, for an in-line engine, very high top

engine speed of 8,250 rpm, an extremely rigid

engine block is necessary in order to

withstand the vibrations and to satisfy the

acoustic requirements.

For this reason, a bedplate structure was

chosen for the engine block. The cylinder

head is also designed as a one-piece unit in

order to achieve the greatest possible rigidity

and to reduce sealing surfaces.

The valve train especially the box-type tappets

with hydraulic lash adjusters (HVA) have been

optimized with regard to weight and friction.

The high dynamics and spontaneity of the

engine render necessary extremely fast

adjustment of the VANOS. This is achieved by

an oil pressure of 115 bar as well as new

proportional valves and VANOS gear

mechanisms.

The rapid engine response also necessitates

the use of individual throttle valves that are

operated side-specific.

The S85 is equipped with a double-disc clutch

and dual-mass flywheel (ZMS) in order to

transmit the high power to the transmission.

Technical data

Engine designation S85B50

Engine type V10, 90°

Displacement 4,999 cm

3

Bore 92 mm

Stroke 75.2 mm

Power output 373 kW/507 bhp at

7,750 rpm

Torque 520 Nm at 6,100 rpm

Engine speed 8,250 rpm

Weight 240 kg

1 - S85B50 Power output diagram

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 119 120

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