Itinerant Air-Cooled

Where is this vacuum line going? As far as I know, no progressive carb has ever been improved by the addition of vacuum retard.

This hose is currently capped off. Colin had me plug this and the other hose.

Carb delivery is on hiatus. When I showed up, the good soul was cussing like a sailor at the new Progressive. He kept the Solexes for now, but will ship if he has an epiphany. My apologies.

No worries. I have two sets and should be able to put one good set together. Am hoping to help my neighbor (Judahthedog) put a set together for his ‘73 auto trans bus so we’ll keep looking. If something changes with your customer, let me know.

Thanks,

Jeff

When you send the carbs to Volkzbitz and get them back, make sure before you install them that you verify all the mating surfaces are flat, the needle valves work correctly (NOS ones available on Ebay, the aftermarket ones are junk) and the float is correct 12-14mm.

If you end up having to file the mating surfaces, you may need to create a thicker gasket to get the float correct. Don't even try to bend the metal tab on the floats.

I can attest that two different aftermarket needle valves this month have given less than stellar results in my experience. Both were on dual Solexes, one bus one Type 3. Is there a list of part numbers for those needle valves somewhere?

Robbie

As of yet, I have not been able to find a schematic drawing of the dual carbs with their various parts. Colin’s write up shows them installed on the engine (including the other components of the system) but I still want to see drawings of the actual carb, throttle body, etc.

I also did a quick eBay search for needle valves and came up short. Will continue to search.

JC

If I had the time and the tools, Jeff, I could do an installation guide. You are not conducting an installation as we speak, correct?
Colin

(p.s. I read something about filing and making gaskets, and I want to hasten to warn you not to do that. Rely on Volksbitz to have all carburetor components properly fitted with properly indexed gaskets that line up all the holes correctly. Maybe he will even supply you with properly functioning needle valves, I don't know, back in the old days, we used to assume basic functionality ... )

If I had the time and the tools, Jeff, I could do an installation guide. You are not conducting an installation as we speak, correct?
Colin

No installation at this time Colin. I'm 900 miles from home for another couple of weeks. My plan is to prep for our appointment in the 2020 lap and install then. Though I have the carbs and components, I don't consider them ready for use or installation.

Just trying to learn more about how they work.

Jeff

Carburetors can be easily disassembled, if you note carefully where each part goes. Most parts will only go back one way, but some can be reversed if you're not careful. With a disassembled carb, you can spray GumOut through any passage to see where it goes. (Eye protection recommended.)

The PDSIT carbs are wonderful mazes of vacuum and fuel passages that funnel fuel right through several gaskets/junctions into other parts of the carbs, hence why the correct gaskets are so important. (One time I found a gasket that had some "hair" hanging off it, blocking a vacuum advance port, and causing all kinds of drivability issues. It came right out of a rebuild kit.)

I am not convinced the new needle valves are any good at all; I'm 2-for-2 in Walker and Royze rebuild kits flooding out my Type 1 engines. Your Type 4 milage may vary.

Robbie

I posted some nice cut away diagrams in my thread...

Thank You. The drawings are very helpful - I’ll have to brush up on my German.

Jeff

BusBassist wrote: ↑

Mon Jul 29, 2019 8:37 pm

Thank You. The drawings are very helpful - I’ll have to brush up on my German.

Jeff

Read this too. Transition ports and emulsion tubes especially:

Thank You Colin.

JC