My recollection is that TDs with 1-1/4" carbs did not have springs in the
carburetors. I would have said the first springs appeared on TFs with 1-1/2"
carbs. But, then, my memory sometimes isn't what it should be ...
Lawrie
British Sportscar Center
----- Original Message -----
From: "Bud Krueger" <budkrueger@earthlink.net>
To: <kingseim@earthlink.net>
Cc: "John Quilter" <jquilter@peoplepc.com>; <sallen3663@qmail.com>;
<mg-t@autox.team.net>; "Lawrie Alexander" <Lawrie@britcars.com>
Sent: Friday, June 24, 2005 10:41 AM
Subject: Re: TD Carburettors
> John,
>
> Could you please recheck your reference and confirm that the AUC549 H2
> carburetors used in most TDs had springs? I've never seen them in
> originally equipped TDs. Perhaps Lawrie Alexander might help us out on
> this.
>
> Bud Krueger
> 52TD (late '53 Engine #28839 w/o springs)
>
>
> John Seim wrote:
>
> > The early MGTC carburettor was equipped with brass pistons. These were
> > later replaced by aluminum or pot metal pistons, with a cast iron or
> > steel ring on the outside of the piston. Pot metal or aluminum being
> > lighter that brass, the ring was added for more weight.
> > Unless the brass and non-brass pistons weigh exactlly the same, they
> > will not operate the same.
> > According to the S.U. Reference Catalog, MG TB & TC's were equipped
> > with a AUC 4587# spring. The Y types did not have a spring. The TD's
> > also had the AUC 4587# spring. The competetion TD's, (1 1/2" carbs, MK
> > II's) had AUC 4587 springs. The "#" indicated "where fitted". The TF
> > 1250 and 1500 also received the AUC 4587 springs. From this
> > information, it can be concluded that if the pistons were brass (TB's,
> > TC's, and early TD's), that there was no spring installed. The TF 1250
> > and 1500 definitely had pot metal or aluminum pistons, hence they
> > should also have springs.
> > As to dashpot tops... Round Brass Caps, AUC 8103, with knurled edges,
> > and vent holes, were used on TB, TC, Y Saloon, TD. Hexagon Brass Caps,
> > AUC 8102, with vent holes, were used on the TF 1250's and 1500's.
> > These cars were equipped with 1 1/2" S.U. type H4, AUC 728 carbs.
> >
> > John Seim
> > Irvine, CA
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