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Nwcali01
Samba Member
Joined: March 08, 2006
Posts: 115
Location: San Deigo CA
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 Posted: Sun Jun 14, 2009 7:24 pm Post subject: 28 PCI minus the vacuum port |
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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
The Distributor Distributor
Joined: April 27, 2002
Posts: 6371
Location: Pentwater, Michigan
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| Posted: Sun Jun 14, 2009 7:59 pm Post subject: |
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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 Those distributors were superceded in 1961.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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Roads Scholar &
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018
1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc
1961 (October)Single Cab- Road Trip Workhorse |
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tasb
The Distributor Distributor
Joined: April 27, 2002
Posts: 6371
Location: Pentwater, Michigan
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| Posted: Sun Jun 14, 2009 8:01 pm Post subject: |
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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.
_________________
Roads Scholar &
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018
1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc
1961 (October)Single Cab- Road Trip Workhorse |
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janerick3
Samba Member
Joined: June 04, 2006
Posts: 1879
Location: Colorado
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| Posted: Sun Jun 14, 2009 8:24 pm Post subject: |
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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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Jan K. |
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splitjunkie
Samba Member
Joined: April 04, 2006
Posts: 4095
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| Posted: Mon Jun 15, 2009 3:31 am Post subject: |
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most likely for a zwitter - '53 oval with the 25hp motor.
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Chris
You know, a lot of these scratches will buff right out... Jerry Seinfeld |
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EverettB 
Administrator
Joined: April 11, 2000
Posts: 69834
Location: Phoenix Metro
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Nwcali01
Samba Member
Joined: March 08, 2006
Posts: 115
Location: San Deigo CA
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| Posted: Mon Jun 15, 2009 5:33 pm Post subject: |
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| 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
The Distributor Distributor
Joined: April 27, 2002
Posts: 6371
Location: Pentwater, Michigan
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| Posted: Mon Jun 15, 2009 5:46 pm Post subject: |
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Would all later 28 PCI have the vacuum port and then it was simply plugged for a bus?
_________________
Roads Scholar &
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018
1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc
1961 (October)Single Cab- Road Trip Workhorse |
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EverettB
Administrator
Joined: April 11, 2000
Posts: 69834
Location: Phoenix Metro
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Nwcali01
Samba Member
Joined: March 08, 2006
Posts: 115
Location: San Deigo CA
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| Posted: Mon Jun 15, 2009 6:20 pm Post subject: |
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Yeah brass float is there...
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
Banned
Joined: October 17, 2003
Posts: 326
Location: Christchurch,New Zealand.
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| Posted: Tue Jun 16, 2009 5:00 pm Post subject: . |
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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
Samba Member
Joined: March 08, 2006
Posts: 115
Location: San Deigo CA
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| Posted: Tue Jun 16, 2009 5:28 pm Post subject: |
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| 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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EverettB
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Joined: April 11, 2000
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Location: Phoenix Metro
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Wolfsburg Classics
Banned
Joined: October 17, 2003
Posts: 326
Location: Christchurch,New Zealand.
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| Posted: Tue Jun 16, 2009 5:44 pm Post subject: |
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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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EverettB
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Location: Phoenix Metro
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janerick3
Samba Member
Joined: June 04, 2006
Posts: 1879
Location: Colorado
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| Posted: Tue Jun 16, 2009 6:54 pm Post subject: |
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| 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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Jan K. |
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Volumex
Samba Member
Joined: October 11, 2007
Posts: 532
Location: Sarnia, ON
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| Posted: Thu Oct 08, 2009 7:20 am Post subject: |
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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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EverettB
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Location: Phoenix Metro
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ProjectX
Accessory Nut
Joined: May 01, 2006
Posts: 1014
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| Posted: Thu Oct 08, 2009 10:15 am Post subject: |
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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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RockStock
Samba Member
Joined: November 26, 2004
Posts: 3929
Location: England
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| Posted: Thu Jan 25, 2024 9:36 am Post subject: Re: 28 PCI minus the vacuum port |
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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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