Engine / Components - Rotax 914 F Maintenance Manual

8.5)

Engine / Components

DESIGN:
BORE:
STROKE:
DISPLACEMENT:
CYLINDER:
PISTON:
CYLINDER HEAD:
COMPRESSION:
INLET VALVE:
EXHAUST VALVE:
VALVE CLEARANCE:
VALVE TRAIN:
CAMSHAFT:
NOMINAL VALVE TIMING
(at 1 mm valve lift):
CRANKSHAFT:
COOLING:
LUBRICATION:
OIL DELIVERY RATE:
IGNITION UNIT:
IGNITION TIMING:
FIRING ORDER:
SPARK PLUGS:
ELECTRODE GAP:
INTEGRATED GENERATOR:
RECTIFIER-REGULATOR:
EXTERNAL ALTERNATOR:
(optional extra):
Modification no.
- 0 -
4-stroke-, 4-cylinder-, horizontally opposed engine
79,5 mm (3,13 in.)
61,0 mm (2,4 in.)
3
1211,2 cm (73,9 cu.in.)
light alloy, NIKASIL coating
cast light alloy piston, 3 piston rings
4 single cylinder heads
9 : 1
38 mm, valve seat armoured
32 mm NIMONIC, armour welding at seat
automatic compensation of clearance by hydraulic tappets
OHV, hydraulic valve tappets, push rods and rocker arms
steel, annealed, liquid nitriding
inlet opens 0° at T.D.C. exhaust opens: 48° B.B.D.C.
inlet closes 48° A.B.D.C. exhaust closes: 0°
supported in 5 journal bearings, case hardened
liquid-cooled cylinder heads, ram air cooled cylinders
1) Main lubrication circuit:
Dry sump forced lubrication system, trochoid pump driven
by the camshaft, oil return by the blow-by gases
2) Suction pump circuit:
Extra trochoid pump driven by the camshaft serves for oil
return from the lower located oil sump of turbo to the oil tank.
1) Main lubrication circuit:
approx. 16 l/min. at 5500 rpm
2) Suction pump circuit:
approx. 4 l/min. at 5500 rpm
ROTAX dual ignition, breakerless, capacitor discharge,
interference suppression
at start: circuit A and B: ......... 4° B.T.D.C.
during operation: circuit A: .................. 26° B.T.D.C.
circuit B: .................. 22° B.T.D.C.
1 - 4 - 2 -3
12 mm, ND X27EPR-U9
see Pic. 129 dimension Y in Chapter 15)
DUCATI permanently exited single-phase generator
(approx. 250W AC)
12V 20A DC
12V 40A DC with full-wave rectifier-regulator
Reference Main Date
1997 02 01
914 F
at T.D.C.
Page
27