11 replies to this topic

[Spud719]

hi and thank you for reading this thread

 

basically im trying to restore a pair of minor 1 1/4 inch SU carbs, ive never restored carbs before so im a little puzzled.

 

do the AUC numbers have to match? for example-

 

the float and the chaimber top are marked AUC2276 PCD17

 

the fload bowls themselves are marked AUC 1310 PCD 9A and AUC1310 PCD 12A

 

the carb bodies are marked AUC1342 and AUC 1341

 

also please can anyone post some pictures of their twin SU's please in detail as i wish to see if I have anything missing.

 

If anyone can id like them to identify my carbs too if they can as Im not sure what HS model they are.

 

thank you- jack

[carbon]

Jack, the carbs you have are twin HS2's if they are 1 1/4 inch diameter.

 

The AUC numbers are the part/casting numbers, and are all likely to be different. What you may also find are a couple of small alloy tags under one of the screws on each of the float chambers. If they are still there they can help to id the original set up.

 

Burlen do a good catalogue which lists all of the parts.

[dklawson]

As Carbon said, you can look up most the parts at the Burlen web site.  Without looking up your specific SU part numbers myself, I can say that in general if you have one front SU and one rear SU with similar looking linkages on the throttle and choke shafts, you can make them work on just about any car where dual SUs were fitted.  Obviously you need a dual SU Mini intake manifold.  Ones form some other A-series engines will be at the wrong angle.  There are also A-series specific linkage kits to join the two carbs that are required.  Once you have the correct manifold and linkage, there are some other parts that may need to change.  If the carbs were not originally from a Mini, there are angle bushings between the float bowls and carb bodies that may need changing to insure the float bowls of the installed carbs are vertical.  There are many different HS carb float bowl lids.  While you may be able to make the ones you have work, there are some styles/orientations that are better for clean routing of the fuel line between the front and rear carb.  After that, there are the mixture related components.  Obviously you want the needles and springs to be "the same" in the front and rear carbs and correct for your engine.  There are some other things that may be different but these are the areas I would look at first. 

 

In short, don't focus too much on the individual part numbers but look carefully at how the carbs are similar to each other and what you will need to properly connect and mount them.

[Spud719]

Thank you for your replies, I will take another look at them tonight and see what I need to complete the set and to keep them both the same.

One other question if you don't mind. If I have the stage one kit fitted, do I need the stage one needles in my twin SU's?

[Stiggytoo]

You will most likely need different needles for your engine. It is pretty much impossible to tell you which needles you will need; and I'm sure a lot of people on here, including myself would suggest you get it rolling roaded to get the best out of them.

Here are a few photos of the ones I have just built up.

[Spud719]

Yeah I'll get my mini on a rolling road once I've fitted them if I ever manage to build them, I think I've bitten off more than I can chew but I bought two sets of twin carbs and a manifold for £25 that need refurbishing so it's worth giving my best shot.

I'll buy the SU workshop manual and work my way throught it.

Thanks for the photos stiggytoo, they help out a lot :)

[dklawson]

You will also find a lot of information on the Burlen web site regarding how the carbs work and how to rebuild and adjust them.  Take the time to read through that information a few times.  As you begin to understand how the carbs work and what the parts are doing, rebuilding them will sound less challenging.  Before you know it you will be very comfortable with your new carbs.  And  you did get them for a great price!

[Spud719]

Yeah they're old and covered in oil and grease but that washes off :)

Thank you for the info, I'll get reading

[surtees]

Thanks for the photos Stiggy it saved having to ask my question! :)

[62S]

The inlet manifold in the picture above is not a Mini one!

[dklawson]

The inlet manifold in the picture above is not a Mini one!

 

That indeed does appear to be the case.  The picture in post #5 above shows 12G242 as the manifold casting number.  I have seen that manifold listed for a couple of non-Mini applications including MG-Midget/AH-Sprite (inline A-Series). 

[Stiggytoo]

 

The inlet manifold in the picture above is not a Mini one!

 

That indeed does appear to be the case.  The picture in post #5 above shows 12G242 as the manifold casting number.  I have seen that manifold listed for a couple of non-Mini applications including MG-Midget/AH-Sprite (inline A-Series). 

 

Thanks for that guys.