R 1200 CL

R 1200 CL
Engine
The two piece light alloy crankcase is manufactured
using a pressure die-casting
method.The oil pan, which holds 3.75 litres,
is integrated into the engine case halves.
As with all R Series bikes, the engine and
gearbox is a combined load bearing element
of the chassis. For this reason, both
case halves were designed with a specific
rigidity with the aid of computer calculations
of the Finite Element Method.
The 1-piece forged crankshaft is accommodated
centrally in the crankcase on sliding
bearings. It runs on two bearings, the rear
bearing being larger and designed as a
double collar bearing. The 125 mm long
connecting rods are made of sintered steel
and are cracked at the big end.
The weight-optimized box pistons are made
of light alloy and have machined valve
notches on the piston crown. A pressure
release channel above the piston ring zone
prevents a partial vacuum from building up
in the combustion chamber during engine
cool down to prevent oil from being pulled
in under vacuum when the engine is off.
The camshafts are mounted into the cylinder
heads by separate camshaft carriers.
The cams are made up of a case-hardened
shaft with pressed-on individual cams
made of sintered material.
The camshafts are roller chain driven at a
2:1 ratio geared down by the auxiliary shaft,
which is located below the crankshaft and
also drives both duo-centric oil pumps.
The valves all have 5 mm valve stems.They
are actuated in pairs by clear chill cast tappets,
short aluminum tappet push rods and
forged valve lifters.
Technical Features in Detail
Engine Components
Crankshaft / Pistons
Cylinder head / Valve train
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