[v12-engine] metering needles

Hello can anyone tell me about the different metering
needles on Stromberg carbs for the 5.3 USA specs.I am
interested to know the differences. The listings are
BIBH,BICQ,BICK metering needles.Are there great
differences? Has anyone interchanged and tried different
needles to see if performance changes? Are these just
different emission needles? thanks for any help.–
series 3 e-type 94 XJ-81 96XJ-81
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In reply to a message from jerald sent Fri 13 Feb 2015:

Hello,

Suggest you contact Burlen Fuel systems (UK) via email and
ask for their ‘‘C.D carburettor Needle Profile Chart’’.
Explain to them and they should be able to provide all the
info, plus sell you the desired needles if needed, what you
are attempting to achieve.

We use FirstNames here on the forum. A little less
formal…

Best of Luck,

Dick

'74 OTS
'99 XJR
1947 Stinson 108-1 ‘‘Voyager’’–
The original message included these comments:

Hello can anyone tell me about the different metering
needles on Stromberg carbs for the 5.3 USA specs.I am
interested to know the differences. The listings are
BIBH,BICQ,BICK metering needles.Are there great
differences? Has anyone interchanged and tried different
needles to see if performance changes? Are these just
different emission needles? thanks for any help.


Growing Old is mandatory Growing Up is optional…
St. Cloud, Florida, United States
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In reply to a message from Dick Wells sent Sun 15 Feb 2015:

They will also be listed in the back of the Haynes Stromberg
manual - it has plenty of tables for which needles were in which
cars and what profile they were.

kind regards
Marek–
v12 E-type running MS3/3X sequential lpg and petrol
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In reply to a message from MarekH sent Sun 15 Feb 2015:

B1CK is leaner at the final 1/3 (with a leaner blip at 1/3) than a
B1CQ
B1BH is leaner in the middle third than a B1CQ

or
B1BH is leaner in the middle third and richer in the final 1/3 than
a B1CK

kind regards
Marek–
v12 E-type running MS3/3X sequential lpg and petrol
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Suggest you contact Burlen Fuel systems (UK) via email and
ask for their ‘‘C.D carburettor Needle Profile Chart’’.

Ooooh! Somebody should post that thing online! Does it cover both
Zenith Stromberg and SU carbs? All sizes?

– Kirbert

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !On 15 Feb 2015 at 6:52, Dick Wells wrote:

In reply to a message from MarekH sent Sun 15 Feb 2015:

Hello thanks for the information. I was on Burlen sight and
they list BICQ for manual USA and Canada specs for 73-74.
But if you scroll up the list shows BICK for 71-74.I was
just wondering what the differences were and why they list
different needles.I thought that the BICK needle might be
rest of the world and the others USA specs. They don’t give
much more information. Best Regards–
series 3 e-type 94 XJ-81 96XJ-81
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In reply to a message from jerald sent Mon 16 Feb 2015:

I played around with the needles in my 71 V12 eType, and
feel I got nowhere except back to the originals. I even
played around with the jet depth, which changed after 72 (I
think). I’m sure there are subtle differnces, but it would
take more expertise than I had to make, or tell a differnce.–
89 XJS convertible Marelli ignition
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In reply to a message from Gene Holtzclaw sent Mon 16 Feb 2015:

I have applied for a chart from Burlen LTD and will post
findings.They don’t recommend needles but information
should be forthcoming.It would seem that headers and de-
emissionized carbs and engine might need enrichment. Maybe
this can be achieved with just richening the current needle
adjustment? I was just interested in needle specs. Best
Regards–
series 3 e-type 94 XJ-81 96XJ-81
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Maybe
this can be achieved with just richening the current needle
adjustment?

The problem there, I believe, is that a small amount of adjustment
will have a fairly large effect at idle and a negligible effect at
WOT. If it’s the WOT you need to change, you’d need to replace the
needles.

There was once a discussion on here about the needles on SU carbs.
The early SU carbs apparently had the float bowls vented to
atmosphere rather than into the air filter housings. As a result,
the restriction of the air filters would change the fuel mixture.
People would replace the OEM air filters with something far less
restrictive and find that the performance would fall off because the
mixture got messed up. And then they found that just a little change
in needles wouldn’t fix it, it required a MAJOR change in needles.
Of course, with a setup like that, just letting the air filters get a
little dirty will also mess up your mixture. Nobody in their right
mind would ever vent float bowls like that, so hopefully the carbs
you guys have are properly vented into the air filter housings.

– Kirbert

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !On 17 Feb 2015 at 9:54, jerald wrote: