Inhaltsverzeichnis
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GENERAL
-
I I I I I I , I I I I I I I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l I l l l l l l l I l l l l l l l l l l
ENGINE
Operation clearance of valve tappets, wiih cold engine,
must
be:
Bore
.................................................................
3.622
in.
Opening r o c h arm:
l n l e i
and
exhoust. in.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0
0039
Ctroke
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.677
in.
Capacity
.....................................................
55.144
CU
in.
Closing rocker arm:
Compression rntio
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 :9,2*0,5
Inlet
and
exhaust:
in.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0
0000+0.0007
Mox. power (crankshofi power]
......................
66 kW
(90
HP1
valve
lifi:
at..
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8,500
rpm
Measurements with a free play of.
0
In.
Mox. engine speed
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.000
rpm
Inlet..
0 3681
in
IMPORTANT-Under
nocircumsiances mustthe engine
beoverrevved
Exhaust:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.3346 in.
1 9
0 0 0
rpmj.
VALVE TIMING
"DESMODROMIC" [iype] with two valves eoch cylinder, controlled
by
four rocker arms
[wo
opening rocker arms and b o close rocker
arms]
ond
by
iour
lobes
O.H.C.. lt
is controlled by the crankshaft
througtt cylindrical gears, pulleys and toothed belts.
The üesmodromic Valve Gear System
1 1
Opening rocker arm (upperl.
21
Opening rocker arm adiuster.
3)
Split rings.
4 1
Closing rocker arm adjuster.
51
Return sprina.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FUEL SYSTEM
-
IGNlTlON
SYSTEM
Manufaciurer.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
W E B E R
~
1.A.W
lt is
a
timed sequential integrated system for ignition and injeciion
contiol.
Thiscontrol isobtained
by
inlectors
( 6 1
[oneeoch cylinder, marked
by
a
progressive number in order
to
identify their
usel
having
two
stable
Operating
siaies:
Open:
the injector delivers fuel;
Closed:
the inlector
does
not deliver fuel.
Thecentralunit(1
)cancontrolihedeliveredfuelquantih/bychanging
the injectorsopening times. The ignition control is got byoperating on
an
ignition sysiem provided with inductive discharge,
consisiing
of
two
~~
coils
( 5 )
[one each cylinder) with ihe corresponding
power
i c
,
.
6 1
Closing rocker arm (lowerl.
7 1
Cornchoft
modules
(2)
The contiol sysiem "senses" the rnotor through a ceriain number of
I~
-
8 1
Valve
The valve opening and closing diogram is ihe following [detection
data with clearance:
1
mm].
lnlet valve:
dia.
1 692
in.
Opens before
T.D.C.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 1
'
Closes after
B.D.C.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
88"
Exhaustvabe:
dia
1.496 in.
Opens before B D.C.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
72"
Closes after
T.D.C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
46"
inputs connected to their corresponding Sensors, each sensor
has a
specific function io provide the central
unit
I.A.W.
with
a
cornplete
detection of the rnotor operation:
- The moior sensor
(14)
sends
a signal allowing the detection of the
rnotor rotating speed;
- The com Sensor
[ l 1 1
provides a reference for the exact timing of
injeciion
ond
ingniiion;
-
The
throttle Potentiometer
(I01
sends
a
signal
05
function of the
ihr&
valves opening angle;
- The absolute pressure Sensor
(81 sends o
signal
as
function of ihe
environmenial baromeiric pressure;
-
The
oil iemperature sensor
(I51
sends
a
signal
as
function of the
rnotor operative temperature,
-
The
air iempemture sensor
1 7 )
sends
a
signa!
05
funciion of the
moior entering air ternperature.
In
order to optimize this system,
a
conirol
strategy called
" A l f a / N
has
been adopted. The rnain inputs taken as reference by ihe system to
control injection and ignition are the ihronle opening angle
(Alb)
and
the rnotor
r.p.m.
(NI.
In
the
ceniral unii memory there are tables that
let
correspond an injection pulse time, an injection phase angle and
an ignition odvonce angle
to o
given r.p.m. and to o given
throttle
opening angle. The oiher system inpuis (water temperature, air
iemperaiure, pressure,
bonery
voltagel take part to the control
by
chonging thecorrection coefficientsopplied io thevolues 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).
'
I I I I I I I I I
Part.
I II l 1 111l l l l 1 l l l l 1 11l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l
N. 67606
(09-90)
A.9
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Inhaltsverzeichnis
