I think that the larger Brosol carburettors were another carburettor that the USA crowd liked because it was cheap and could go on a VW, not necessarily particularly easy to set up. They have a thing about their "Kadrons". So its the usual fuel pressure, float height checks to make sure that the carburettor is jetted right, then the problem is that they are still a single barrel carburettor feeding two cylinders which draw fuel unevenly .. If the solex carbs are in reasonable condition, they can be set up to work pretty well, with their additional balanced idling circuit. The Brosols are a cruder solution - do you have a balance pipe between the manifolds? it may help with getting them to idle better.
44s are enormous. I’d have doubts you’ll ever get them running right. A pair of ICTs would probably do nicely
But even ICTs are another cheap compromise. As it says in the Weber carbs book.. The reason they work better than the Brosols are they have smaller venturis better matched to the smaller VW engine. The hard to get small barrel Dellortos are probably the best carburettors, with 4 point fuel injection being best of all.
I would get the original carbs refurbished personally. They are hard to beat on a type 4. What exactly is the running problem?
What size is the engine? 17/1800cc 34 ICTs will do, if it’s a 2.0l 40 IDFs with 28mm vents are probably better. 44 carbs are far too big for a bus engine.
What is the engine capacity, 1700, 1800, 2.0l or larger? And you asked what are the best Weber’s to use, Dells aren’t Webers. FRDA36 will be fine, especially if the engine is 1700 or 1800 but they would also work okay on a 2.0l.
Really looking for what the best answer so I don’t make another mistake when purchasing. Hence asked about Weber then looked up dellorto’s
Engine capacity is the criterion. Jets, venturi and carb float are linked to it's fuel balance and mixture supply. If you get can get it running and it's rough source a 123 distributor and then you can sort out the jetting etc. 36 dells would be my recommendation as you can play around with the jetting venturi and accelerator jets. Mine ran for 60k after fitted on a 80k mile 1700 type 4 engine. Really make sure you get the mixture right, as to lean will definitely drop a valve if you're on a long run.
As above, I’d imagine FRDA36s would be fine. Not too dissimilar to the original Solexs, I’d imagine, but without the over-complication.
