You can download a program that lists and compares many hundreds of needles
(there are two sets - .090 which are used on the 4-cylinder MGB, and .100
which is used on the factory V8) from Rich Masons site at
http://ro.com/~rmason/mgpage.htm/#helpzone . You can use the program to
select a needle that is close to your existing, but differs by specific
amounts in specific areas. They are also listed on the web site below -
select 'Spanners' and 'SU Needles'.
PaulH.
MG Cars Webring MG Site of the Month - September '99
http://freespace.virgin.net/paul.hunt1/
(or if that URL doesn't work try )
(http://194.168.54.52/paul.hunt1)
-----Original Message-----
From: David Hill <davhill@cwcom.net>
To: Richard A. Boris <borisri@earthlink.net>
Cc: mgs@autox.team.net <mgs@autox.team.net>
Date: 20 September 1999 22:23
Subject: Re: SU Carburetters
>Hi, Richard,
>
>I've just been checking on this. SU do some alternative spec needles but
>not for all models of carburettor.
>An alternative when the needle is very close is to have a rolling road
>test and get the operator to slim
>down your own needle at the tip end.
>You can also check for yourself that mixture is the problem. Run the car
>under load for about 30 seconds and without lifting the throttle, cut
>the ignition and pull off the road. Remove a spark plug and if its
>electrodes are white, you have weak mixture.
>This is called a 'plug chop' and gives a useful snapshot of mixture
>strength under specific conditions.
>
>However. TAKE GREAT CARE NOT TO LOCK YOUR STEERING when you switch off.
>
>Dave Hill
>
>"Richard A. Boris" wrote:
>>
>> Hi Everyone:
>>
>> A fellow member of the MG Car Club- Long Island Center recently
>> installed a SU K44 carb (from Victoria British) on his 1978 MGB.The
>> single SU provides fine idle and low to mid range performance, however;
>> under load such as hilly grades the power drops off, even with the
>> throttle fully open. Questions: is anyone familiar with the carb, and
>> are there rich high end needels available??
>>
>> Thanks: Rich Boris, 67B
>
>
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