Uaz carbs K129 and K131

[Ditch]

Does anyone have any experience of the difference between the K129 and K131 carbs.

[Eastblock]

No idea but I have asked the question on the German UAZ forum:

http://uaz-welt.communityhost.de/

[Ditch]

Nice one mate.

[Eastblock]

And the replies were (with my attempts at translation):

K129 = Alt (und sehr durstig) Old and very thirsty

K131 = Nachfolger und Weiterentwicklung (nicht mehr ganz so durstig) Replacement and further development, not quite so thirsty.

Der K131 hat eine Gummimembran für die Beschleunigerpumpe, wo der K129 nur einen einfachen Kolben hat. K131 has a rubber diaphragm in the acelleration pump, the K129 uses a piston.

Der K131 hat mehr Möglichkeiten, was einzustellen und damit auch viel mehr Potential zum VERSTELLEN. Wenn er denn aber mal richtig eingestellt ist, verbraucht er wesentlich weniger Kraftstoff, als sein Vorgänger, der K129. There are more settings to tweak on the K131 and when correctly set it uses a lot less fuel than the old K129 carb.

K131 hat außerdem eine Unterdruckdose für den Choke, kein Schauglas mehr und, wie schon gesagt, etliche Verbesserungen im Inneren. The K131 has a vacuum chamber for the choke, no sight glass (some variants do) and is overall an improvement.

Er spart im Vergleich zum K129, jedenfalls bei mir, wirklich ne Menge Sprit bei gleicher Leistung. It saves a considerable amount of fuel compared to the K129 but with similar performance

Hope that helps?

Michael

[Eastblock]

I have an adjustement guide for the K131 but it is in German (Rob can help you with translation). I have also found the complete repair and user manual in German for the 469B. PM me if you want it.

Michael

[Eastblock]

No idea but I have asked the question on the German UAZ forum:

http://uaz-welt.communityhost.de/

BTW, can't really recommend that forum. I asked the question in German but a few people kindly switched to English. Didn't take long before someone came along and complained about it! Seems to be the norm on German forums - I've had it happen before. Glad I don't live there anymore - people are a lot friendlier in the UK.

Michael

[Ditch]

It's a pity. There is a lot of expertise about these cars in Germany and the Eastern block and it would be really good to get access to it. We have some native polish speakers on the forum maybe they can post questions on Polish Uaz forums if needed?

[Eastblock]

There is another German forum with a section on Uaz. Perhaps they are less hostile.

Michael

[Abrs]

Perhaps they are less hostile

Just don't mention the war!! :lol:

[Eastblock]

And don't use sarcasm!

[Abrs]

Well thats us lot screwed then :lol:

[Trapper Ind]

Hi, We have been led to believe that the k131 carb was first developed for the volga/gaz and other civilian vehicles that use variants on the OHV engine block. It has far better ways of doing things and has slightly better economy.
We have seen at least 7 different types so far of 131 carb K131a through to 131g so be carefull which one you get if buying, some of them wont even fit and some have things like automatic chokes and air throttles.

[Ditch]

I thought everyone knew the Germans were completely devoid of a sense of humour!!

Isn't Rob German??

P.S back to carbs................fit a weber!!!!

More than happy to do that if anyone can find a part number for an alternative.

Good to see you again this weekend James. Good luck with the rest of the conversion and regards to your lovely wife "what time is it".

[Ditch]

Going back to the subject :roll: ...................

Seeing the success James had with a Weber carb on his Gaz has anyone come across an alternative carb for the Uaz 469 or Gaz 69?

[K Berg]

What size is the flange you bolt it to, and what size bore does the manifold have?
Is it a 1bbl, or 2bbl carb?

Those engines are...somewhere around 2.5 liters?
What is the max rpm, and cruising rpm of these cars?
What kind of throttle linkage?

I am guessing they have manual chokes?

[Ditch]

38mm bore on manifold.
Two M10 bolts 75mm apart on centreline.
Manual choke
75 hp (56 kW) at 4000 rpm, 166.7 N·m (123 lb·ft) at 2200 rpm;
2.5 litres low compression 7:1
Cable throttle linkage

[K Berg]

I will see if I can find something that would fit...

What exactly do you guys want from a carb?

simple, or good on gas, or glow in the dark, or???

Anyway, I have a few carbs laying around, for different purposes, and I think some of them might be ok on something like these cars.

Would hood clearnace be an issue if it was a tall carb, or you had to use an adapter?

[Ditch]

For me a replacement carb would be to improve the MPG, torque and responsiveness. The settings on the K129 that I am running are very basic and it runs very rich all the time. I haven't driven the thing much yet but it has a real on/off feel to the throttle control.

I have a K131 that I will try but a more modern design would also be of interest.

The carb has an oil filled filter on top which could be changed so upward space is not a problem. The great thing about the Weber alternative on the Gaz is that it pretty much just drops straight on. Would be good to find the same for the Uaz.

[K Berg]

Well, looking thru my box of old carbs, most american carbs from the 60's and up would fit on the 75mm bolt spacing, I found an old holley 1904 from an international inline 6. that one would accept the 10mm bolts too.

I found a newer holley/autolite unknown model, with a similar flange, but smaller bolt holes. It has plenty of meat to drill the holes to 10+mm, and enough room to fit them too. It is very similar to the holley 1946, which is a bit more modern than the ancient, but very simple 1904.

This means you could use a later model carter yf, carter bbs, holley 1920, 1945, 1946, 1947, and a bunch of other us-built carbs. They should work well when setup for the engine you use them on. Very simple carbs, and plenty of spare parts and rebuild kits availible.

I believe solex and weber has 1bbl carbs that would fit too, but they are probably a bit harder to make work well (as they are more complicated carbs) but should work fine when setup right.

The thing is that I don't know how well any of these work off road, except the holley 1920, and carter yf.
These will work well, if the carter has the offroad needle/seat with a spring.

sorry that I could not be of more help here, but it is something...

I kinda wonder how this engine would react to more compression?

[Ditch]

Thanks for that. I'll start looking about for an alternative.