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28 PCI minus the vacuum port
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Nwcali01
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PostPosted: Sun Jun 14, 2009 7:24 pm    Post subject: 28 PCI minus the vacuum port Reply with quote

I acquired a 28 Pict carb today @ the bug o rama and it has no port for the vacuum advance line. Is this for a type 3 motor or??? Any info would help...thanks!

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tasb
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PostPosted: Sun Jun 14, 2009 7:59 pm    Post subject: Reply with quote

Way too early for a type III. Those distributors were superceded in 1961. That would be correct for a 36 hp bus which used mechanial advance only distributors not requiring a vac port.
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tasb
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PostPosted: Sun Jun 14, 2009 8:01 pm    Post subject: Reply with quote

It's not a 28 PICT it's a 28 PCI. I would be interested in that carb as I have two buses running 36 hp engines.
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janerick3
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PostPosted: Sun Jun 14, 2009 8:24 pm    Post subject: Reply with quote

Since it's not marked "28 PCI", it's '55 or earlier, probably with a brass float. Is a brass part number tag still attached to one of the cover screws?
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splitjunkie
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PostPosted: Mon Jun 15, 2009 3:31 am    Post subject: Reply with quote

most likely for a zwitter - '53 oval with the 25hp motor.
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PostPosted: Mon Jun 15, 2009 3:14 pm    Post subject: Reply with quote

Yes, these are 53-only. Both Bug and Bus.

They are hard to find if you need one. Smile

I changed the title to PCI for future searches. It's a 28 PCI carb. even though the 28 PCI was omitted from the side in these early models.
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Nwcali01
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PostPosted: Mon Jun 15, 2009 5:33 pm    Post subject: Reply with quote

Wow thanks for all the info everyone...so these carbs pretty much fall into the zwitter era give or take. Nice. It doesn't have the tag on top but ive seen those before so i know which ones youre talking about...it might have been taken off? Ill check to see if it has the brass float tho.
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tasb
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PostPosted: Mon Jun 15, 2009 5:46 pm    Post subject: Reply with quote

Would all later 28 PCI have the vacuum port and then it was simply plugged for a bus?
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PostPosted: Mon Jun 15, 2009 6:05 pm    Post subject: Reply with quote

Yes, Bus have a small screw in there.

If you mean later meaning the ones that say 28 PCI then yes but there are even ones without the "28 PCI" marking that have the fitting as I think those were used through at least 1954/early 1955.

On Buses it's a bit confusing as I have had a 1/55 Bus that a no-marking 28 PCI carb. but I've seen another super low miles 1954 Bus that has it. On both we are 99% sure the carbs. are original.

Some 1953 carb. pics from the gallery:
http://www.thesamba.com/vw/forum/album_page.php?pic_id=424238
http://www.thesamba.com/vw/forum/album_page.php?pic_id=424236
http://www.thesamba.com/vw/forum/album_page.php?pic_id=424235
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Nwcali01
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PostPosted: Mon Jun 15, 2009 6:20 pm    Post subject: Reply with quote

Yeah brass float is there...

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I found a zwitter carb in the classifieds and only see a few differences...one being mine doesn't have the small molded indentation where a vacuum line could have possibly went? A small round notch near the jet screw on the right side and the 'made in w germany' print on the top cover near the jet.

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Wolfsburg Classics
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PostPosted: Tue Jun 16, 2009 5:00 pm    Post subject: . Reply with quote

This is a '54 -early '55 Bus carb, not a Zwitter carb.
Here is my thoughts on this, I have been through all this before trying to find the correct cab for my March '54 20- engine. The early Zwitters and '53 Oval's all ran 25hp with non vacuum advanced distributors s the carbs are different in that they do not even have that cast part where the vacuum advance line should go on a Beetle, or should not go on a Bus.
In '54, with the introduction of the early 36hp on a Beetle they introduced the vacuum advance hence needing to cast this part into the carb body, for a Beetle these were macnined to take this and since a Bus still did not run a vacuum advance they were not machined to take one, this carb also having the non 28pci marking, brass float bow, different VW logo on the side etc etc puts this carb at -54 to early '55 Bus only, later Bus carbs had the 28pci marking.
Should also have a serial number on it as well......
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Nwcali01
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PostPosted: Tue Jun 16, 2009 5:28 pm    Post subject: Reply with quote

The serial number would be the number stamping on the float side of the carb right? It has the numbers 952223...
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PostPosted: Tue Jun 16, 2009 5:35 pm    Post subject: Reply with quote

Thanks for the additional information. I have seen the carbs. with no cast vacuum section as well.

Do you know the approximate serial number of a '54-early '55 carburetor?

I'm curious because I have the carb. off an 1/55 Bus and it is machined for a fitting but with a screw inserted to block off the port. It does not have a brass float or 28 PCI markings but the brass float could have been changed out.

Here's another thread
http://www.thesamba.com/vw/forum/viewtopic.php?t=183491
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Wolfsburg Classics
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PostPosted: Tue Jun 16, 2009 5:44 pm    Post subject: Reply with quote

Everett
The serial number of my carb is 1013134 and it has brass float, no 28pci markings, cast and un machined vacuum port nodule.
I would say your carb is a Beetle one with the screw to block off the vacuum port.....
I looked along time to find my carb.
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PostPosted: Tue Jun 16, 2009 6:11 pm    Post subject: Reply with quote

For reference,
The one I have off my 1/55 engine is 148xxxx. (Could be a later replacement based on info in this thread)

My unmachined one is 949xxx.
Unmachined side:
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PostPosted: Tue Jun 16, 2009 6:54 pm    Post subject: Reply with quote

EverettB wrote:
Thanks for the additional information. I have seen the carbs. with no cast vacuum section as well.

Do you know the approximate serial number of a '54-early '55 carburetor?

I'm curious because I have the carb. off an 1/55 Bus and it is machined for a fitting but with a screw inserted to block off the port. It does not have a brass float or 28 PCI markings but the brass float could have been changed out.

Here's another thread
http://www.thesamba.com/vw/forum/viewtopic.php?t=183491


Dec '54 BD carb w/blocking screw (no brass tag), S/N 1377021
Jan '55 T-1 carb w/vac port (brass tag 111 129 023), S/N 1436019

Hope this helps...
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Volumex
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PostPosted: Thu Oct 08, 2009 7:20 am    Post subject: Reply with quote

Found this amongst my junk. Vacuum port area appears to not even have a boss. Serial 832221. I have no idea what it is from.

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PostPosted: Thu Oct 08, 2009 9:57 am    Post subject: Reply with quote

As mentioned above, it's most likely from a 1953 25hp engine.
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ProjectX
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PostPosted: Thu Oct 08, 2009 10:15 am    Post subject: Reply with quote

Actually, there is no casting for the vacuum port, so this is the very first generation of the 28 PCI and could be from a late '52 Zwitter or early early '53 oval. The next generation had the casting for the port, but no drilled/tapped hole for the vacuum line.
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PostPosted: Thu Jan 25, 2024 9:36 am    Post subject: Re: 28 PCI minus the vacuum port Reply with quote

Is the vacuum advance block-off (with a screw) the only difference between a bus and a beetle 28PCI carb?

So a beetle 28PCI carb can be correctly used on a bus by just fitting this block-off screw?
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