AUD82 SU - trivia question

[JPSmit]

anyone know what an SU carb AUD82 is off of?

thanks

 

[tony barnhill]

I thought all the AUD numbers were 3 numbers, not 2....how big is the throat? 1-1/2?

 

[SilentUnicorn]

i have been looking Here https://www.sucarb.co.uk/ProductSearch.aspx

no 82 tho. It appears that some have a two digit number...how about a pic of the tag?


mark

 

[JPSmit]

OK so I'm an idiot - it's an AUC 82 - here are some pics

Oh, and Tony, the throat is 1 1/4" (HS2 right?)

carb with manifold

 

[JPSmit]

and throat one

 

[JPSmit]

and two

 

[JPSmit]

and number

 

[JPSmit]

and manifold

(BTW I have a number of these so they aren't all the same carb)

 

[tony barnhill]

AUC.......hmmmmmm.....just from looking at them, they look like the carbs on my '63 Midget but I think all our MG's were AUD's.....& I've never seen manifolds like that before either.....were they used in single carb setup or dual carbs? Almost looks like single carb....

 

[JPSmit]

I keep thinking motorcycle or something. Either it is a single or it bolts to another manifold piece. The guy I got these from is into microcars but even there I can't think of a single cylinder with an SU - though maybe a 2 cylinder with 2?

 

[ChrisS]

The AUD 13 carburetor assembly used a AUC 82 body I believe. It almost looks like the manifold was used to adapt it for down draft flow, maybe in a A40 Devon or similar. Ask Nial (aeronca65t) he knows A40's.

 

[aeronca65t]

No the '50s Austins (A40s, A30s, A35s, etc) used Zenith (downdraft) carbs.

I'm puzzling over this too. Morris Minors used SUs on their OHV (Austin-based) engine but I'm not sure about the 1-1/4" size. I would have guessed that the Minors used the older 1-1/8" carb (like a Bugeye).

[edit]

Here's a single carb Minor manifold below:

 

[swift6]

I spent some time scouring an SU reference catalogue. I could not find a reference to an "AUC 82", AUC carbs with only a two digit numeric suffix were fairly rare in this catalogue. I did find some that were close though.

AUC 81
HV2 type carb
1930 Wolseley Hornet
12hp Hornet 6-Cyl

AUC 282
HV2 type carb
1935 Singer
9hp Sports 4cyl

AUC 824
H4 type carb
1956 ZA/ZB Magnette

AUC 825
H2 type carb
1958 Hillman Minx
Derrington 4cyl.

Also found one reference to a English Ford Conversion set.

AUC 820
H2 type carb
1955-57 Ford Zephyr
W.H.M.B. Ltd, 6cyl
2262cc engine
This set used three carbs so there is reference to an AUC 820F, AUC 820C, AUC 820R

 

[tony barnhill]

Well, I went through my SU reference book that covers every SU in use from 1960 onwards & there's no AUC 82....so, it must be an earlier vintage,

But, I did find AUD's with only 2 numbers, something new to me.

 

[swift6]

The oldest vehicles that my catalogue references are as follows.

1929 Lagonda 14hp 4-cyl (AUC2)

1929 Lea-Francis 12/40hp Supercharged 4cyl (AUC8)

1929 M.G. "M" type 4cyl (AUC59)

So I guess it covers from 1929 forward.

 

[Roger]

That's a reasonably modern SU - mid-fifties or later - so precludes a pre-war vehicle. Pre-war SUs had solid (banjo-style) mounted float chambers.
The manifold (or adapter) in the first photo is clearly for downdraft application, adn try as I might I can't think of a production vehicle that had SUs as standard with a downdraft manifold. It would pretty much have to be a "Nuffield - BMC" mass-produced car, or else a low-production car, like Morgan, or maybe a Coventry-Climax or similar engined one.

So that leaves special adaptation, tuning or what-have-you, like the Minx and Zephyr tuning kits referred to above. I know VW Derrington were fond of SU adaptations, though they were also Weber agents.

Short answer - I don't know!

 

[terp83]

John-Peter:

Could you share with us the Letters and/or numbers on the metering needle? Perhaps we could "back in" to the prior use if we had that info.

Jerry

 

[JPSmit]

John-Peter:

Could you share with us the Letters and/or numbers on the metering needle? Perhaps we could "back in" to the prior use if we had that info.

Jerry

Good idea - but of course the plot thickens. here is what I found:

On the Float chamber it says AUC 1390 with PDC10 below it

On the Float chamber lid of two, there were tags. As near as I can tell (they are worn)

one says: FZX 1253
the other says: FZ 1351 10WK 744

I took 5 needles out and 4 were different. They were

AAC
AAT (two of them)
BCW
and EB - the only solid (no spring) needle.

I have no idea if this helps

 

[ChrisS]

The numbers on the tags are the carb model numbers. The other numbers are the individual component part numbers. The 3 letter needles are self centering indicating a "newer" carb.

Are you sure there isn't an X in the second model number. If there is they look like they may have come off of Reliant Robins.

 

[Roger]

The numbers on the tags are the carb model numbers. The other numbers are the individual component part numbers. The 3 letter needles are self centering indicating a "newer" carb.

Are you sure there isn't an X in the second model number. If there is they look like they may have come off of Reliant Robins.

Good catch! I forgot Reliant. Sometime in the 70s they replaced the Zenith with an SU and that may well have sat on a D/D manifold.