Hi Mike,
First: During late TR4A production, pressure was on to reduce emmisions - and
Standard-Triumph changed the TR4A distributor and carb specs during
production. The TR4A WORKSHOP MANUAL SUPPLEMENT dated 1967 - says static timing
was
retarded to TDC instead of 4* BTDC and vacuum and centrifugal advance were
altered to EXTEND the operating range to permit this retarded static setting.
It
states SUs were being used and they specify weaker metering needles & jets and
increased resistance on the damper plunger to counteract the weaker needle.
I only mention these facts as it may indicate what might have been happening
to the Stromberg settings around 1965-66 before the SUs were reinstated.
My mid production TR4 didn't have any factory emissions equipment (open
breather like the TR3) and I don't know what you are doing with your 4A
emission
equipment (intact? removed?) but for 2006 you might want the late TR4 carb and
distributor specs rather than the later 4A's 'emissions driven' settings.
I assume your Lucas distributor is marked 40795 A ##65, vacuum advance is
stamped 2-6-3, and your Stromberg carbs are stamped 3043 near the air intakes
(indicating carbs you have below);
1825 = TR4 1963 - early 1965 2A needle, natural color air valve spring
3043 = TR4A early 1965 only 2E needle, natural color air valve spring
3089 = TR4A May 1965 -1966 2H needle, red color air valve spring
The 'Stromberg Spare Parts Schedule for TR4/4A' clearly shows that 3043's use
2E needles.
MossUK catalogue shows you can still buy; 2A, 2E, or 2H Stromberg needles for
#10.95 each ( see
http://moss-europe.co.uk/MossUK/ProductList.aspx?SubSubCategoryID=TR2_UTRIS008D
)
You might be able to get these delivered cheaply through MossUSA since they
bought MossUK a few years back.
You probably would be interested to know that both the 2A and 2E needles go
with an air valve return spring p.n.# 019674 (in natural color) but the later
2H needles go with a 'more resistant' air valve spring p.n.#020685 (red in
color).
Any of these 'needles' can be had for #6.40 and the 'air valve springs' for
#3.80 at 'Gower and Lee' in the UK as listed below (in fact Jeff sent me a
chart showing side by side comparison of needle profiles; 2A, 2E and 2H) which
I
will send to your email address directly (anyone else can let me know if they
want it).
Also, somebody was looking for STROMBERG FLOATS.. Gower & Lee sells these new
for #25 each. Jeff can be reached at:
Jeff Carter
sales@gowerandlee.co.uk
www.gowerandlee.co.uk
Tel/fax + 44 (0)1923 247300
Gower & Lee
P.O. Box 91
Bushey
Herts WD23 2ZG
Regards,
Carl
'63 TR4 since '74
---------------------------------------------------------------
Listers,
I am rebuilding the Strombergs on my 4A. The needles in the carbs have 022
stamped on them. Mine is early (1965), and the factory workshop manual
specifies a 2E needle ( up to CTC 54939, then 2H is specified).
Moss just shows two needles.....a 2A needle for TR4 and 2H for TR4A.
Is anyone familiar with the 022 size/designation? I have the profile for the
2H from an earlier post...does anyone have information on the 2E?
The engine is stock except for 87MM pistons. Has anyone experimented with a
different metering needle for this modification?
Thanks
Mike Godley
65 Tr4A
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