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AUD15L and AUD73R

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irish

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Recently ordered a carburator rebuild kit for a 61' AH Sprite (SUH2 carburators, AUD 15L and AUD 73R). The rebuild kit that the company had sent was for a 1098 engine; one of the jets was too tight a fit and I sent both needles and jets back.

Needing to identify my engine numbers in order to identify the correct needles and jets I found that the engine numbers were not the expected 9cg... or 10cg... but MOWOG 04J 950 192 2A 799 ?? Anyone familar with any of these numbers?? Probably a rebuilt. How can you tell the difference from a 948 vs a 1098?

I now understand that the AUD15L and AUD73R means I have two SUH2 carbs from two different models. Don't know if the PO ran the car with these carbs but they look like they've been used. Will this carb combination work? ...help... /ubbthreads/images/graemlins/mad.gif
 
All the HS2 carb bodys are basically the same.
Early models used a fixed needle, later mocels used a swing needle. The only differences are the needle set screw in the piston, and the addition of vacuum tubes for PCV on the bodys.
these brass tubes face each other on the inside of the carbs.
All the jets are .090 regardless as to what year carb you have. So if you buy a pair of kits, they should work. Assuming both kits have the same needle in them and a .090 jet. As power increased with engine size, different needles were used. Again with emissions, different "swing" needles were used later on.
As for the needles not fitting, did you center the jet bearing tube? to do this, loosen the large nut just a bit and install the jet, let the piston with needle in it drop as you gently snug up the bearing nut. It takes a few trys but it works.
Maybe somebody just switched float lids thus the different ID tags. Look at your old needles, if they are the same, the carbs are the same. This is the only difference, the tags tell what needles were originally used in that carb.
As for the engine, 948s have "950" embossed on the block under the carbs. 1098s have "1100" on a metal tag riveted to the block just under the front carb. If it has side covers, it's on of those 2 engines. If no side covers, it is a 1275, again, there should be a tag riveted to the block stating so.

Frank
 
spritenut-
lots of good information, thanks.
My model HS2 carb bodys must be the fixed needle type (it's fixed in the piston, and has a needle set screw in the piston, no vacuum tubes...).
The "950" is embossed on the block so it is a 948, and the old needles look the same size so the carbs should be similar.

Question: since the carb bodies have AUC1341, and AUC1342 imprinted on them but the ID tags on the float lids have AUD15L and AUD73R, the two HS2 carb bodies I have probably came from two different Sprites?? It is likely (of course, anything is possible in Spriteland) that I have one HS2 carb from a 1098 and one from a 948? But, as you say, it shouldn't matter as long as the jets are .090 (and the needles are the same). I'll see what the "company" says about this and let you know...irish


/ubbthreads/images/graemlins/computer.gif
 
Hi Irish,
I think Frank fairly well covered it all. Getting the jets centered is one of the most critical aspects of having the carbs work proper. Now, as for your new question, the carb bodies AUC1341 and 1342, the 1341 and 1342 simply differentiate a "front" carb body from a "rear" carb body. Again, all the carb bodies for these carbs are identical, the only difference over the years were the things Frank mentioned before like the addition of the PCV ports. As for the tags on the float lids, I've got an entire BOX of carbs in my garage, probably 4 or 5 sets, and they all have different tags on them if they have tags at all. Many of these got lost or mixed up over the years of rebuilding. When I just rebuilt a set of SUs for my mom, it took me quite some time to sort through that box and find float lids that matched because they had all been swapped around and then it took more time to try to find tags that matched the year of her car (I found one AUD 266F tag and no 266R). So to sum it up again, if the kit came with two needles of the same size, then you should be set as long as you get them centered. Any non matching numbers generally referr to front versus rear. Good Luck!!

JACK
 
Hello Irish,
for the record an AUD15L is the left carburettor from a 998 Mini Cooper 1961 1962 and the AUD73R is from a 1098 Sprite 1962 1963. One difference is the spring, the correct AUC4587 should be in the AUD73R but the AUD15L has a AUD4387 so it is probably a good idea to order a pair of AUC4587 as identification paint has usually worn off old springs.
There is no problem, as earlier per replies, in using these carburettors on your engine.

Alec
 
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