
GENERAL DATA
Car
Weight
Although no particular
skill
is required in
Complete
Car
with their application, an elementary know-
Tools, Fuel and ledge of the correct way to fit
them
is
Water necessary. It is not intended to refer to
18 cwts.
3
qrs. 7 lbs. (955 kg.) each type of speed nut in detail and, in
any
Shipping Weight case, thetypes at present
in
use arelikely to
17 cwts. 2 qrs. 21 lbs. (902 kg.) beincreasedas production proceeds and
the
desirability of their employment become
Tyre Sizes and Pressure
apparent.
Tyre Size
......
......
5.50"-15".
Tyre Pressures
2.
DESCRIPTION
Front
......
22 lbs./sq. in.
1.55
kgsq.1.a. Spire speed nuts provide a compensating
Rear
......
24 lbs./sq. in. 1.7 kg./sq.
a.
thread
lock.
As the screw is tightened, the
Where cars are to be used for racing or special two arched prongs move inwards to engage
high testing it is desirable that the Dunlop and lock against the flanks of the screw
Rubber Company be consulted for special tyres. thread. The prongs compensate for toler-
ance variations in the screw.
A
spr@
Water Capacity
locking action is provided by
compression
Cooling System
......
13pints 7.4 litres of the arch in both prongs and base as the
With Heater Fitted
....:.
14
pints
8
litres screw is tightened. The combined forces
of the threaded lock and that provided by
Oil Capacity
the spring prevent loosening due to vibra-
Engine-From Dry 11 pints 6.25 litres tion.
Drain and
Refill
......
10 pints 5.7 litres
3.
TIGHTENING TORQUES
Gearbox
...... ......
18pints .85 litres
,,
with Overdrive 3) pints 2.0 litres Unlike normal threaded nuts, spire speed
From Dry nuts do not require a great deal of torque
Rear Axle 14 pints .85 litres when tightening the screw. The retention
............
of the screw by the nut depends on spring
Petrol
tension alone. When tightening a screw
into a speed nut, only sufficient torque
Petrol
Tank
capacity 12+galls. 57 litres should
be
used to produce
the
thread and
spring lock shown in Fig.
3.
Excessive
Body Specification
Two seater open sports,
all
weather equipment.
Detachable windscreen of Triplex safety glass.
Provision for fitting aero screens.
Steel body rust-proofed.
Front wings, rear wings and complete front
panel are bolted on detachable
type.
Door hinged at front.
Fig.
3
Showing
an
Untightened SpireNut on the
left of the illustmtion
and
on the other
SPIRE SPEED NUTS
side
a
fully
tighxened one.
I.
GENERAL
NOTES
These speed nuts are being used in in- torque will only distort the ends of the
creasing numbers on our products at the prongs kd
affect
their spring tension and
present time in the place of nuts and lock may even break
them.
washers, as, in many instances, they sirn- Spire speed nuts
can
be used indefinitely
plifjl manufacturingprocesses and speed up providing they have not been damaged by
assembly work. over-tightening.