Rotax 912-UL - Page 6

2)
Description
EXECUTION:
of
design, technical data
DESIGN:
BORE:
STROKE:
DISPLACEMENT:
PERFORMANCE:
MAX. TORQUE:
MAX. A]IOWED SPEED:
CYLINDER:
PISTON:
V4LVE
TRAIN:
CYLINDER
FIEAD:
COMPRESSION
RATIO:
INLET
VALVE:
E)GIAUST
VALVE:
VALVE CLEARANCE:
CAMSHAFT:
NOMINAL VALVE
TIMING
(at
I
mm valve
lift):
CRANKSHAFT:
COOLING SYSTEM:
LUBRICATION SYSTEM:
OIL
CAPACITY:
38.912.0101
model 1988
31.912.0101 without overload clutch,
model 1991
31.912.0111
with
overload clutch, model
1991
3l.9l2.Ol3l with overload clutch,
vacuum
pump,
mod. 1991
4-stroke-,
4-cylinder-, horizontally
opposed spark
ignition
engine, one central camshaft,
push
rods,
OHV
79,5
mm
(3,13
in.)
61
mm
(2,4in.)
1211
cm3
(73,9
cu.in.)
c. 59
kW
(80
hp)
at 5500
r.p.ffi.,
performance
sheet Lb.
365
c.
103 Nm
(60
ft.lb.) at 4800 r.p.rr.,
perform.
sheet
Lb.
365
5800
r.p.m.
light
alloy, MKASIL
coating
cast,light-alloy
piston,
3
piston
rings
OHV, hydraulic
tappets,
push
rods
and rocker
arms
4
single cylinder heads
9:1
38
mm
(1,5
in.)
32
mm
(1,26
in.) NIMOMC,
armour welding
at seat
automatic compensation
by
hydraulic
tappet
steel, annealed,
nitro-carburized
inlet
opens:
at
T.D.C.
exhaust opens:
47"8.B.D.C.
inlet
closes:
47oA.B.D.C
exhaust closes:
at
T.D.C.
supported in
5
joumal
bearings
liquid-cooled
cylinder
heads, ram
air cooled cylinders.
Oil
cooler
in
air stream
dry sump
forced
lubrication by oil
pump
driven
from
cam-
shaft,
oil
return
by blow-by
gases
3litre
(.793
gal
US)