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DESCRIPTION OF ENGINE
(see
Fig.
4
& 5)
The" V7» model is equipped with a twin-cylin-
der
90'
V
engine
.
Cylinders
have
light alloy
bar-
rels
with
hard
crame linings
and
are
deeply
finned for cooling
.
Cylinder bottoms
fit
into
suitab
le
housings in
crankcase.
Crankcase
in
ligllt alloy
,
provided with
six
bolts
(fou
r
long, two
short)
to secure
cylinders
and
cylinder
heads.
Cylinder heads are
in
light alloy,
with
special
cast
iron inserted
valve seats.
Rocker
box covers in light alloy. Steel construc-
tion
crankshaft on
two special tin-aluminium alloy
main bearings, pressed in suitable housings.
Steel construction con-rods with
thin
wall bear-
ings
at
big ends and bronze
bushes
at small
ends.
Piston
in light alloy. with 4 rings: 3 over
pin
(two
piston
rings and
one oil scraper) and 1
below
pin
(oil
scraper)
,
O.H.V.
valve
gear,
operated
through
camshaft,
tappets, push rods and rockers. Camshaft
gear
driven by crankshaft
.
Carburetors are gravity fed
.
Pressure
lubrication from oil sump through gear
Fig.
5
10
.:.
,
'\'(r~'
";'~
:Y·!~
-
.
'.
. .
'
,',
,
..
,
~
..
'
..
,
'j: ••••••
~~
..
~
....
~
,
\.
'".
""':
'.
..
Fig.
"
pump
driven
by crankshaft.
Oit
recovery
by
gra-
vity. Wire gauze type oil cleaner
in
crankcase
.
Lubrication pressure
control
led
by relief
valve.
Breather
tube conveys oil vapors Into
breather
box from which
,
after condensation. oil
returns
into sump.
Pressure
is
d
ischarged outside
through
vent
tube.
Engine
is air cooled
.
Cylinders and cylinder
heads are
suitably finned
.
Ignition
by battery
,
coil
and distributor
operated
by crankshaft
through built-in
gear.
Electric
starting
,
electrically controlled.
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