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MG TD TF 1500 - Original 1 1/4' SU AUC Model Number

Been through the archive in a vain attempt to ID the original 1 1/4" SU AUC model number. I think they're supposed to be H2's with the 1 1/2"'s H4's. I have a collection of swap meet carbies with the bodies numbered AUC 6060, 6070 & 6080, which are similar, but not identical. I assume the front & rear carby don't have the same AUC number. Does anyone know what the AUC model numbers of the front & rear 1 1/4" carbies that were originally fitted to the standard TD is? The numbers in the parts list don't help.
Cheers
Peter TD 5801
P Hehir

Peter - e-mail me at SUfuelpumps at donobi.net and I'll send you copies of the Burlen Fuel Systems that gives all the particulars on the carburetors for 1929 MG M type through 1969 MGB (sorry, it all comes in a lump scanning). Cheers - Dave
PS - I probably won't be able to get back to you until later tomorrow (Sun 1 Feb) as we are to go with friends for some shopping (no, we are not good Americans who will be watching the Super Bowl).
D W DuBois

Thanks Dave. Much appreciated. Seems like you're the hands on "go to" guy on this site. I'd already emailed Burlen but it may take a few days to get a response from them so tomorrow will be more than OK. My eldest son played grid iron for Sydney Uni as a corner back so like most Yanks I'll also be watching. Cheers
Peter TD 5801
P Hehir

Hi Peter,
I still have my original 1 1/4' H2 carbs and I think you are correct in that they do have different part numbers. They are stored away, but I shall dig them out and confirm the part numbers to you.

George
George Raham [TD4224]

Peter - "tomorrow will be more than OK." Still need you e-mail address (I think that you may have e-mailed me some time ago, but cannot find it. Cheers - Dave
D W DuBois

Thanks George. Dave you have mail. Cheers
Peter TD 5801
P Hehir

I seem to remember that both front and rear 1-1/4" carbs are AUC549, with the differences being in the throttle shaft lengths, controls, fittings and float bowls.

This may not be the number you are looking for, since Mark II (TD/C) carbs are technically AUC578, but the carb bodies themselves (unique to the Mark II) are marked 4031/12 and 4031/8, with the numbers after the slash vibra-etched on by hand.

Tom Lange
MGT Repair
t lange

I would also be interested in the numbers and where they are found on the carb. Mine are the correct size for a TD but have piston lifting pins and I was told, I think by John Twist, that they are not originals.
John Quilter (TD8986)

If the only differences are the peripherals Tom I can deal with that. John the AUC number is on the body of the carby adjacent to the air filter manifold. About 6 months ago I was lucky enough to pick up a pair of 1 1/2" SU's with the numbers 4031 at a swap meet for $25 the pair! I'm about to rebuild them & have acquired an original inlet manifold which I'll open out to 1 1/2" Cheers
Peter TD 5801
P Hehir

I checked my carbs on my July 1951 build TD and they are front: AUC6070 followed by an A in a circle. Rear: AUC6060 D. Are these correct and original for a TD?
John Quilter (TD8986)

According to the Burlen data John, no they're not. However as Tom Lange says the differences are peripheral. Once these are installed with the externals as per AUC 549 it would be difficult to see any difference. As the number is under the body adjacent to the air filter manifold it is impossible to see once installed. My rear body is 6070 A & the front is 6080 Q. Like yours these must have come from other cars. Dave's Burlen 4 page printout only shows M.G. carbies. I'm ensuring mine have all the bits that are shown in the sketches in the Driver's Handbook & so I'm taking the appropriate bits off my swap meet carbies & I'll leave it at that. Tom is correct as Burlen only show one AUC # for the TD 1 1/4" SU, that is AUC 549 for front & rear. Burlen would be able to tell you what car your carbies were originally fitted to. Cheers
Peter TD 5801
P Hehir

I bought some rattle can carby cleaner which was next to useless. I was wondering if I should get a large bottle or two of Coke & immerse one of my old carbies in a plastic bucket to remove storage grime & crud?.. as "things go better with Coke"... Seems to work on old pennies. Anybody got a better suggestion? Cheers
Peter TD 5801
P Hehir

G'Day Peter,
It is interesting to read the different carb numbers above and compare them to my original set. My TD came "out the door" on Nov. 7th 1950. The numbers on the my carbs are
Front -- 3478 B
Rear -- 3478 G
The "3478" on each carb are 5mm raised letters while the "B" and the "G" are slightly smaller. They are found on the left hand side of the carb body immediately behind the air manifold flange.

These carbs were removed from the TD in 1955 when I modified the motor to compete with the new TF. The engine is still to that spec.

Sorry to be so long in getting back to you, but looking for something that you stored 60 years ago took a bit of time.

George
George Raham [TD4224]

G'day George. Interesting indeed! According to Burlen the numbers on your carbys don't exist on M.G.'s!! Their data sheet from 1929 to 1969 shows that all AUC numbers used on M.G.'s were 3 digit numbers with just the Magnette Mk IV & the 62/63 MGB showing 2 digit numbers. As you are an original one owner George it seems the Burlen data is incorrect & we need to look further afield to identify the original carbys fitted to our cars. This sounds like a job for a researcher of the calibre of Chris Couper? PS. Anyone have any suggestions for an effective initial carby clean? Cheers
Peter TD 5801
P Hehir

Peter,

The numbers given by George 3478 B and 3478 G, are correct but are the casting numbers for the original bodies. The carb part number is AUC 549

John

J Scragg

Well Peter you got me thinking this AM. Please look at the attachment. The only number I could find on the carbs I could find on the carbs that came with my car was PDC on top 3478L below that.

I could not find any other markings. I put in a second picture below. Maybe that will help you too.

Are these supposed to be on the TD? They worked for years.

Thanks

Joe


JWP Policastro

Big picture of carbs.


JWP Policastro

Peter

Liquid Degreaser sold by "Supercheap Auto" will do the task without etching of components. Totally submerge for 24 hours, then wash off and air dry with an air pistol connected to your compressor.

I posted a link to invaluable info on carbies some time ago, a search of the archive under my name should find it.

Graeme
G Evans

Best thing to clean carburettors is to soak in cellulose thinners and brush well until all the muck is gone
Iain MacKintosh

Seems there are two different types of numbers. PDC which John has identified as the casting number & AUC which is the part number. The 549 part number tallies with the AUC number given in the Burlen data sheet. John do you know where I could find a list of the SU PDC casting numbers & also a numerical list of the AUC carb specification numbers? (The Burlen list is alphabetical by model). I'd like to learn which cars my carbs actually came from. Thanks for the info Graeme. I'll give it a try. Cheers
Peter TD 5801
P Hehir

Hi

This is to help the recent query Thread: Looking for information about carburetter bodies




Thanks
Mike
M Wood

This thread was discussed between 01/02/2015 and 15/07/2020

MG TD TF 1500 index

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