BMW K 1300 GT - Manual (Page 18)

BMW
Media
Information
10/2008
Page 18
In the process the intake air fl ows past two separate paper air fi lters newly
developed for the K 1300 S and merging at the end of the funnels just where
they lead into the airbox. To ensure simple and straightforward service, the
paper air fi lters are easy to reach after removing the side panels on the fairing.
Apart from the modern cyclone oil separator serving to purge the engine, the
airbox also contains the newly confi gured idle system. In order to save weight
and space through the integration of functions, the airbox fi nally also serves
to hold the battery in position.
New exhaust system – three-way catalyst for optimum emission
control, exhaust butterfl y for extra torque and a sporting sound.
On the revised exhaust system of the K 1300 S the four individual manifolds
of exactly the same length merge initially into two pipes beneath the gearbox
and then into one single pipe leading on into an extra-large, newly developed
rear muffl er (4-in-2-in-1 principle).
The muffl er sign fi cantly shorter than on the former model and now fi nished
in sporting hexagonal design offers a capacity of 9.1 litres (K 1200 S: 9.5 litres)
despite its short length and works according to the refl ection principle.
Both the outer skin and the all-new interior of the rear muffl er now much
lighter than before are made of top-quality stainless steel.
The metal-based catalytic converter with 200 cells/square inch is integrated
exactly at the point where the manifold merges into the rear muffl er
and comes with a coating of rhodium and palladium combining superior
temperature resistance with a long service life.
Full maintenance of the strictest noise and emission limits, despite the
increase in engine power and performance, is ensured on the K 1300 S for
the fi rst time at BMW by a butterfl y in the collector pipe electronically
controlled and opening up the full cross-section of the exhaust manifold as
a function of increasing engine speed. At low to medium engine speeds the
variable cross-section remains relatively small to build up greater ram pressure
in the interest of extra torque and pulling force, while the full cross-section
opened up at higher engine speeds serves to develop maximum power and
a sporting sound.
Apart from making an important contribution to the even more muscular
torque curve and improving the motorcycle’s riding characteristics in the
process, the new muffl er offers a powerful sound pattern full of character but