Triumph Spitfire MK3, Handbook

Page: 75 / 81

GENERAL SPECIFICATION
74
GENERAL SPECIFICION
Engine
Number of cylinders 4
Bore of cylinders. 2.9 in. 73.7 mm
Stroke of crankshaft. 2.99 in. 76.0 mm
Cubic capacity. 79.2 in.
3
1296 c.c.
Piston area 26.5 in.
2
l7l.0 cm
.2
Compression ratio 9.0 :1
Valve rocker clearances
(cold)
0.0l0 in. 0.25 mm.
Valve timing Inlet and exhaust valve equally open
at T.D.C.
Maximum power. 75 b.h.p. at 6000 r.p.m
Maximum torque 900 lb.in. (l0.37 kg/m.) at 4000 r.p.m.
Equivalent to B.M.E.P. 144 p.s.i. (l0.1 Kg/cm
2
)
Lubrication (Engine)
Pump High capacity eccentric lobe type.
Filter Replaceable full-flow type.
Pressure at 2000 r.p.m. 40-60 p.s.i. (2.8 - 4.2 Kg/cm
2
)
Cooling System.
“No loss” system incorporating plastic
overflow reservoir
Circulation Pump, driven by "Vee" belt;
thermostatically controlled flow.
Fan Four blade l2.l25 in. dia. (308 mm.).
Fuel System Tank above rear axle . No reserve tap
Pump A.C. mechanically operated
diaphragm type
Carburettor Twin H.S.2 S.U
Needle size B.O.
Manifolds Separate inlet and exhaust. Water
heated inlet manifold
Air cleaners Twin replaceable paper elements.
Crankcase breathing Closed circuit controlled by emission
valve between rocker cover and
manifold
Ignition System
Coil Lucas HAl2.
Distributor Delco-Remy
Contact breaker gap 0.0l5 in. (0.4 mm.).
Rotation Anti-clockwise.
Firing order 1-3-4-2
Sparking plugs Champion N.9.Y
Gap 0.025 in. (0.64 mm).
Electrical System
Voltage 12
Polarity Negative earth