BMW S 1000 RR - Uživatelský manuál stáhnout pdf (Strana 6)

BMW

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information

09/2014

Page 6

New benchmarks for output and torque.

The water-cooled four-cylinder in-line engine, together with its intake and

exhaust system, underwent extensive modification and redesign work to

prepare them for use on the new RR. Output now peaks at 146 kW (199 hp)

at 13,500 rpm, an increase of 4 kW (6 hp) on its predecessor. Maximum

torque has risen slightly from 112 to 113 Nm (83 lb-ft) and comes on line at

10,500 rpm. The usable rev range has been widened considerably on the new

RR, meaning that near-peak torque is on tap constantly between around

9,500 (112 Nm) and 12,000 rpm (113 Nm / 83 lb-ft). The result is even

punchier start-off characteristics and pulling power. Maximum engine speed

remains unchanged at 14,200 rpm.

Re-engineered cylinder head with new duct geometry, new intake

camshaft and even lighter intake valves.

The principal development objective for the new S 1000 RR was to further

improve on its predecessor’s already outstanding power and torque figures

and combine this with enhanced rideability for superb all-round performance.

With this aim in mind, the geometry of the intake and exhaust ducts was

modified while the cams on the intake camshaft were given a fuller contour.

These measures are further reinforced by lighter intake valves (2 g less per

valve) and valve springs that have been adapted accordingly.

In a quest to reduce friction losses, the cylinder barrels that are integrated into

the top half of the engine block now undergo slide honing. The top half of the

block continues to accommodate the compact and lightweight six-speed

gearbox as well, whose shift precision is now sharper than ever.

Improved intake system with shorter intake lengths, larger airbox

and full E-gas ride-by-wire.

The intake system also underwent some extensive modifications with the aim

of not just boosting maximum output, but also substantially upping torque

delivery especially in the zone around the 4,500 rpm mark that is so important

for performance dynamics. Consequently, the diameter and length of the

intake manifold were recalculated and the throttle valves repositioned closer

to the cylinder head. The combination of the redesigned intake ducts and the

2. Drivetrain.

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BMW S 1000 RR - Uživatelský manuál Strana 6