GENERAL
DATA
GENERAL
DATA
Summaries of dimensions and tolerances,
relative to various components are given at the
commencement of the respective sections to
which they refer.
Whlst data given, in some
instances, in
ths section appears elsewhere in
the body of
ths manual, such
information being
frequently required, it is considered desirable
that it should be summarised in this section for
easy reference.
For the convenience of overseas readers, a
table of metric equivalents is included in this
section.
CHASSIS SPECIFICATION
Engine Details
Type
......
......
Bore of Cylinder
Stroke of Crank
....
Cubic Capacity
......
(Swept Volume)
.....
Compression Ratio
......
Firing Order
Compression Pressure
(With three Spark-
ing Plugs fitted and
com ression gauge
in
F
ourth cylinder
engine warm, throt-
tle set at tick
over,
using 20 SAE oil
and operating the
......
starter)
......
Sparking Plug
Make and Type
......
Sparking Plug Reach
......
Sparking Plug Gap
Distributor
............
Distributor Break Gap
Ignition Setting
......
(Full Retard)
O.H.V. Push
Operated.
3.268" (83
mm.)
3.622" (92 mm.)
121.5 cu ins.
(1,991
c.cs.)
8.5
1, 3,4, 2
Rod
Average
realng
120 lbs. per sq.
in.
(8.4 kgs. per sq. cm.)
Champion No.
LlOS
High speed work No.
L1 1s.
g''
(12.700 mm.)
.032" (.S
mm.)
Lucas DM2 P.4
.015" (.4 mm.)
4" B.T.D.C. (Based
on the use of
he1
with a minimum Oc-
tane value of
80).
......
Vacuum Advance Basic setting 4 divi-
sions.
Inlet Rocker Clearance
Touring,
.O1ol'- (.25 mm.)
High Speed
Motoring
.013" (.33 mm,)
Exhaust Rocker Clear-
......
ance
......
Touring
.012" f.30 mm.)
High
spe;d ~otohn~
.013" (.33
mm.)
The above measurements are based on a cold
engine.
......
Crankshaft
......
Crankshaft Bearings
....
Crankshaft Thrust
......
......
Connecting Rods
Connecting Rod Bear-
ings, Big End
......
......
Small End
......
......
......
Pistons
......
Piston Rings
Compression Rings
Scraper Ring
......
......
......
Camshaft
Three journal molyb-
denum manganese
steel stamping with
integral balance
weights.
Vandervell bi-metal
shell bearings.
Four half semi-
circular white metal
faced washers fitted
in pairs either side of
the centre bearing.
60-ton molybdenum
manganese steel
stamping with big
end caps offset to
camshaft side.
Floating gudgeon pin
secured by circlips.
Lead
indium bronze
bearings.
Clevite Bush.
Aluminium alloy split
skirt
compensatmg
type, graded
F.
G or
H.
All
fitted above gud-
geon pin.
Cast iron,
.062" wide.
Cast iron,
,156" wide.
Special cast iron with
four bearings and
silent
cont6ur sym-
metrical cams.
Driven by Duplex
chain.
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