what kind of carbs are these?

not sure what they are on the bowl it says S.U.Carburetter Co ltd
birmingham england. any help?

 

they are in fact SUs , I would guess volvo or brit. sportscar.

 

And,they are upside down.

 

<TABLE id=HB_Mail_Container height="100&#37;" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"><TBODY><TR height="100%" UNSELECTABLE="on" width="100%"><TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">I had a pair of them years ago on a 56 Austin Healey 300-4. Rags
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Those look kinda small, they may have been for a motorcycle. Those are some clean looking carbs.

 

hehehe, they are!!

 

Yep... SU Carbs, like everybody said already.

They do look kinda small, could be off a old Mini Cooper, or a Sprite, or something like that.

They have a Variable Venturi.
( in your pics one of the Barrels is up, so check its not stuck )
Gravity and a Spring push them down, and there is a Oil Filled Dampner on top.

A really awesome system in theory ( it will always keep the airspeed up at at the spot the Main Jet introduces the Fuel into the Airstream )

In practice, they are a ***** to synchronise.
And ( going by the ones I have owned ), not that great on gas milage either....

 

That kit is for a Midget.

http://www.royze.com/Kitmg.htm

<TABLE cellSpacing=1 borderColorDark=#b4bf07 cellPadding=6 width=709 align=left borderColorLight=#b4bf07 border=1><TBODY><TR><TD align=left width=233 height=26>[FONT=Arial, Helvetica] Midget MKI - 948cc<!--mstheme-->[/FONT]
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61-63​

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</TD><TD align=middle width=114 height=26><!--mstheme-->[FONT=Arial, Helvetica]SU HS2<!--mstheme-->[/FONT]
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2​

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</TD><TD align=middle width=53 height=26><!--mstheme-->[FONT=Arial, Helvetica]SU-764<!--mstheme-->[/FONT]
</TD><TD align=middle width=68 height=26><!--mstheme-->[FONT=Arial, Helvetica]WZX1300
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thanks for the info ...my father gave them to me with new rebuild kits we didnt know what they were.. they are in fact very clean inside and out......now gotta find somethin to put em on

 

They were and are combined with lucas electrics and oil leaks what combined to give British cars their reputation for unreliability. Volumetrically they will be OK for up to a bout a 1500 cc 4 cylinder. Look at the area you have pointed up in the pic and you will see a nut. this adjusts the main jet needle up and own in venturi. Initially these should ble screwed down till just snug then loosened about 9 flats of the nut on both carbs. This will give you a starting point for a 948 engine each flat opened enriches the mixture. You can get a decent sychronization with a piece of tubing and your ear. You hold the tube to the carb intake area, then adjust them at idle till you get the same tone sounding through the tube held to your ear.

SU's are basically cl***ified by the diameter of there throttle plates. Next size up would be found on TR 3, MGA and MGB, VOLVO, and AH 4 cylinders. Larger ones on Jaguars and such. Rover used 2 on a cross manifold on thier buick based V8's.

I have a highly modified pair for my AH Bugey sprite. The car was used for hill climbs and autocrossing for a number of years. I used Marvel Mystery Oil in my dash pots.

 

I have 2 of those on my Mini.

 

Those look like HS2 1.25 SU's

http://su-filters.com/sucarbs.html