Zenith Carb

[don't_bug_me]

Mine was leaking, bad o-ring(#40), replaced, seems fine, but probably could use a rebuild, question, anybody have a digram or just the description of the numbered items in the diagram posted, also posting another diagram without the numbered parts for reference for printing while working on them. And, not sure if this site has been posted before, if so, posted again--->http://porsche356registry.org/resources/tech-artic...etors.html


If anyone has the numbered descriptions, please post-em, thanks

other diagram I found

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70 Street Baja http://www.thesamba.com/vw/forum/viewtopic.php?t=566113

"Necessity is the mother of invention"

[borninabus]

i know it sounds like a lot of work, but maybe you should read through the thread and find out what info already here

i may have the descriptions in the 356 service manual for the 2nd diagram.
the first i have seen many times--like, a few pages back--but have never seen the descriptions for it.

which #s are you needing to know?
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88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport

[don't_bug_me]

I've browsed/read through most of the thread, don't need to know any individual part at the moment, but would be nice if I get this carb tore apart and find I need some replacement parts, also, if you know, who sells rebuilt kits for these, only asking because of how old this thread was originally, and not sure how current some of it's sources are.
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70 Street Baja http://www.thesamba.com/vw/forum/viewtopic.php?t=566113

"Necessity is the mother of invention"

[borninabus]

[sovereignsamba]

[SCVGuy]

I finally picked up my wish list VW-a 73 Thing in very clean and solid SoCal condition. It has the original AM case but was rebuilt sometime in the past into an 1835 with the tall dellorto carb on it. The PO cut a hole in the top of the body to allow enough room for the air filter. The engine is starting to knock a bit and is blowing a lot of oil. Just did the main seal. I think it's at least 3 of the pushrods tubes which I'm told could be because of high heat issues.

Reason I'm posting here is that I have a spare engine that I'm thinking about switching into the thing until I can afford a rebuild on the original. The replacement engine is a single port numbered case (no letters) that I'm told was rebuilt as a 1776 and it has a Zenith carb. I don't know the previous history of the motor. Was told by the PO that it ran well.

Is this a possible solution or am I just asking for more problems by using this engine in a thing?

Another thought would be to sell the zenith motor and use the money to fix the original. Not sure what the motor would be worth though.

Any thoughts, suggestions, comments would be appreciated.

thank you!

[dustymojave]

[AZ-BUG]

All 3 diagrams in one spot, including bottom one with descriptions.

other diagram I found

Descriptions

[larryducas]

this is my setup on a 1776 dual port.



works good for me, but needed bigger main jets.

http://www.thesamba.com/vw/forum/viewtopic.php?p=7329055#7329055
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71 deluxe, 1968 type 1 engine rebuilt, 009 distributor, pertronix module, Empi 38 EPC / DGES carb

[mr_bill]

Is it possible to just block off the enrichner with a plate....OR...should I just leave the lever wired open ?? This is a single P010 on 1776
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see ya' on the trail........

"Mr Bill"
Dos Perros Motorsports
Orange, CA
1972 Class 11x/Stock Bug
'60's era "vintage" Tunnell-Buggy

"...no one here....get's out ALIVE...."

Motor = electric
Engine = internal combustion

www.facebook.com/groups/DosPerrosMotorsports
www.alrchapter132.org
www.DAV.org

[borninabus]

you can do it either way.
wiring it closed is kind of overkill, it'll stay where you put it.
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88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport

[borninabus]

hey Zenith crowd
i have a predicament and need some advice.

my zenith is discharging lots of gas through the secondary vents when i throttle it.
I don't remember this as being normal operation.
the carb sat for a few years but was stored well and was clean when i opened it.
regardless, it has been cleaned inside and out.
the fuel level is spot on @ 19.5mm as is the fuel pressure @ 2.5psi.
the needle valve is working properly.
the float does not appear to be sunk; no fluid in the pontoons.
bowl vent is clear and it idles great with no leakage, but as soon a you open the throttle it starts to leak.

any ideas?
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88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport

[flashho]

I just went thru the exact same thing. My problem was the air vent for the bowl was blocked, so it built up pressure and leaked.

from
http://sucarb.co.uk/technical-carburetter-maintenance-settings-flooding

Another cause of flooding, often mistaken for an over high fuel pump pressure, is caused by air trapped in the float chamber. When fuel is fed into the float chamber it rises and the float shuts off the needle valve. If, however, the chamber air vent is blocked, the fuel rising compresses the air in the chamber and fuel is forced out of the jet at pump pressure.

There are several different methods of venting the float chamber, from a simple hole in the lid to overflow pipes, all of which can be blocked in various ways. If in doubt, loosen the fixing of the float lid just enough to allow air to escape and see if this cures the problem. If it does, then hunt down the blockage and remove.
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rant _ classified ads with out pics are almost worthless

[Danwvw]

Ok how are we checking fuel level 19.5mm full or down from the top I see where earlier it says in this thread by "XxonValdez" Here: the fuel level should be .728" down which is 18.5mm well that's pretty close isn't it. I am all ears, I need to check mine too. Already fouled a plug just testing. Got to get a wide band!
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[flashho]

19.5 mm down from the top, when carb is level.

back a few pages
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rant _ classified ads with out pics are almost worthless

[Danwvw]

On mine the gas level turned out to be 24mm down. I take it that reading is taken with the floats in place? There is a big strange sideways pointing wood screw or something screwed into the bottom of my float bowl and one of the floats rest on it and when I started adjusting the float a little it would get jammed against that screw and the side of the float bowl! Is that screw supposed to be there? after much trying and failing to even get gas to flow into the carb again I finally put the float in the vice and used a drift and hammer to make a catastrophic adjustment to to it. Guess What it Fits now! The gas level is 19mm. Tunes and all is well again. Oh, by the way "borninabus" I looked down the throats of the Zenith 32 carb with the engine running and revved it and don't see big drops of gas or anything going in except what comes out the accel jets when the throttle is moved.
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[flashho]

Yes, with the floats in place. I don't recall seeing a wood screw thing. You may want to check the washer on the needle valve. It should be 1.5mm thick. Mine was less than .5mm, so I made one from alum. sheet.
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rant _ classified ads with out pics are almost worthless

[Danwvw]

Thanks "flashho" It's Together now and set pretty good! Never thought of that! Good Idea so the needle valve washer thickness can be used to dial in the gas level. You know at that leverage angle (Needle Valve to float) it would not take much to make a big difference in gas level. Sounds like that is how it's done!
I have another question. My idle jets are without Orings! It seems to tune ok though, Mixture screws dial in at about 1 turn out. Do I really need Orings on the idle jets?

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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[mr_bill]

fresh off the PROFORMANCE dyno....& ready to re-install in the 11 Car....
_________________
see ya' on the trail........

"Mr Bill"
Dos Perros Motorsports
Orange, CA
1972 Class 11x/Stock Bug
'60's era "vintage" Tunnell-Buggy

"...no one here....get's out ALIVE...."

Motor = electric
Engine = internal combustion

www.facebook.com/groups/DosPerrosMotorsports
www.alrchapter132.org
www.DAV.org

[borninabus]

OH NO, Mr. Bill!
that engine looks far too nice to go in a class 11!
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88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport