Hi listers,
I sent this out last week but doesn't seem to have made it (too long?) - so
sending in 2 parts now.
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Hi all,
I believe this to be the last word from Leyland Triumph on
TR4A and Spitfire MK.3 distributor specs; (I'm guesstimating it was published
in 1968)
WORKSHOP MANUAL SUPPLEMENT for Spitfire MK.3 and TR4A:
1st Edition
Incorporating Emission Control Equipment
Engine Modifications - TR4A
The specification for the TR4A remains unaltered except for the following
details:
1 CARBURETTOR
a) Needle - New needle fitted to provide a weaker mixture
b) Main Jet - A new main jet is fitted to suit the revised needle
c) Piston Damper - The piston damper is modified to restrict movement of the
barrel. This provides a more immediate effect on the piston to give maximum
accerleration with the weaker needles and jet settings
d) Throttle Disc Poppet Valve - This is a small spring loaded poppet valve
set in the carburettor throttle disc. At high manifold depression, that is
during overrun with throttle closed , the valve opens to supplement the volume
of
fuel/air mixture which, together with a retarded ignition setting, maintains
correct combustion.
2. IGNITION DISTRIBUTOR
The system includes a special distributor which has an extended operating
range to permit a retarded static setting whilst maintaining the normal advance
characteristics at higher engine speeds.
TIMING MARKS
TR4A Idle Speed RPM = 850/900, Ignition Static (Crankshaft Degrees) =
T.D.C., Ignition at Idle = T.D.C.
Ignition Distributor Data
Centrifugal advance (check at decelerating speeds)
Distributor RPM Degs. distributor advance crank rpm degs. cranshaft
advance
below min max below min max
400 no advance to occur 800
500 0 3.5 1000 0 7
700 7 10.5 1400 14 21
900 11 13.0 1800 22 26
2500 11 13.0 5000 22 26
(* cont.)
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