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Ducati 1992 Superbike 851 Workshop Manual Page 21

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GENERAL
ENGINE
S.P:92
i
S.P.S
Bore in.
3.70
3.70
2.52
54.168
11±0,5
88 (1201
10.500
11000
I
Sup:92
, 3.62
Stroke in.
2.52
2.52
51.91 I
0,5±0,5
71 (951
9.000
10000
Total disploment cu.in.
54.168
Compression ratio.
1 1 ±O,5
Max. power (at the wheel I kW (HPI 82 (I III
01
r.p.m.
Max. engine speed r.p.m.
10.500
11000
IMPORTANT -
Under no circumstances the engine must goes over
10.000 r.p.m. (Sup.'921 ond I 1000 (S.P.'92 and S.P.S.I
TIMING SYSTEM
"DESMODROMIC" (typel with four valves each cylinder, controlled
by
eight rocker arms
(4
opening rocker arms and
4
close rocker arms)
and by two head camshahs. It is controlled by the driving shoft through
cylindricol geors, pulleys and toothed belts.
The Desmodromic Valve Geor System
IIOpening rocker orm (upperl.
2)Opening rocker arm adjuster.
31Split rings.
4)Closing rocker arm
adiuster.
51Return spring.
61Closing rocker orm (Iowerl
7lCamshah.
8lVolve.
The valve opening and closing diagram is the following (detection
data with cleorance: 0.008 in. ond 0.039 in. Belt tension through
tool 88765.0999 at I 1.51
Inlet valve: in.
Opens before TD.C.
Closes aher BDC
Exhaust valve: in.
Opens before B.D.C
Closes after T.D.C
,
S.P.S.
S.P. '92 Sup. '921
~m9
OOOSI 0039 Ooosjom9
01.34
01.3
01.3l
73'153' 66' 44' 30':11,1
92' 71' 98' 73' 94' 170'
01.18
01.14
01.14
100'177" I 00'177' 84' 162'
64' 42' 64' 42' 44' 18'
....
Operation clearance
of
valve tappets, with cold engine, must be:
Opening rocker arm:
Inlet: in.
Exhaust: in.
. 0004+00047
................ 0006 .. 00067
Closing rocker arm:
Inlet and exhaust: in.
. .......... 0002 .. 00031
Valve lift:
S'P~'"
s:.P.'92
- -
-
---
Measurements with a free play of: 0 in.
Inlet: in. .......................... ......
0.43
0.39
Exhaust: in. .............................
0.35
0.35
FUEL SYSTEM - IGNITION SYSTEM
0.378
0.344
Monufacturer .....
. ........................ WEBER - lAW.
N' of injectors each cylinder: ....... I (Sup.'921, 2 (S.P.'92-S.P.S.I.
It is a timed sequential integrated system for ignition and iniection
control.
This control is obtained by iniectors (6) having two stable operating
states:
Open:
the iniector delivers fuel;
Closed: the injector does nol deliver fuel.
The central unit ( II can control the delivered fuel quantity by changing
the injectors opening times.
The ignition control is got by operating on an ignition system prOVided
with inductive discharge, consisting
of
two
coils
(5) (one each cylin-
der) with the corresponding power modules (21
The control system "senses" the motor through a certain number
of
inputs connected to their corresponding sensors, each sensor has a
specific function to provide the central unit
I.AW.
with a complete
detection
of
the motor operation:
- The motor sensor (141 sends a Signal allOWing the deteclion of the
motor rotating speed;
- The
cam sensor
(1 1) provides a reference for the exact liming
of
iniection and ingnition;
- The throttle potenfiometer ( I 01 sends
0
signal as function of the
throttle valves opening angle;
- The absolute pressure sensor (81 sends a Signal as function
of
the
environmental barometric pressure;
- The water temperoture sensor (151 sends a signol as function of
the motor operative temperature;
- The air temperoture sensor (71 sends a signol as function
of
the
motor entering air temperature.
In order to optimize this system, a control strategy called
"AIa/N"
has
been adopted. The main inputs taken as reference
by
the system to
control iniection and ignition ore the throttle opening angle
(Alfa)
and
the motor r.p.m. (N). In the central unit memory there are tables that
let correspond an iniection pulse time, an injection phase angle and
an ignition advance angle to a given r.p.m. and to a given throttle
opening angle. The other system inputs (water temperature, air
temperature, pressure, battery voltage) take part to the control by
changing the correction coefficients applied to the values prOVided by
the "Alfa/N" tables. Then the system introduces further corrections in
the operating conditions requiring particular ignition and feeding
features (ignition phase, qUick opening or closing
of
the gas control).
Advance:
.................................... 10°
(fixed up to 950 r.p.m., then the control box varies this value
according to the signals it receives from the cam sensor).
9

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