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Cheburashka
Samba Member
Joined: July 10, 2018
Posts: 145
Location: WA
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 Posted: Fri Nov 14, 2025 5:10 pm Post subject: 34-PICT 3 Confusion. Bocar vs. VW Germany |
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Hi All,
I put a rebuild kit in my Bocar 34-PICT 3 carburetor and I picked up a German-made 34-PICT 3 just to verify that I had put everything in the right places. I was surprised to find that there were significant differences between the two carbs. The Bocar pilot jet is in two pieces, while the German one is a single piece. The most confusing thing for me is that the Bocar has a jet in the float bowl that's not present in the German one. Also, the main jets are different sizes.
Are parts interchangeable between these? Why such a big differences? Will one perform better than the other?
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vamram 
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Joined: March 08, 2012
Posts: 8194
Location: NOVA
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| Posted: Fri Nov 14, 2025 5:49 pm Post subject: Re: 34-PICT 3 Confusion. Bocar vs. VW Germany |
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The German jets will not fit that particular Bocar. Be careful, I 86'd my nice Mexican Bocar like yours by messing up the threads on the idle jet - I used an idle jet from a chinese after-market version of the same "sherryberg" carb and damaged the threads because the pitch (?) of the threads was not the same between the two carbs.
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to put moral chains upon their own appetites. -Edmund Burke
'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
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Cheburashka
Samba Member
Joined: July 10, 2018
Posts: 145
Location: WA
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| Posted: Fri Nov 14, 2025 5:56 pm Post subject: Re: 34-PICT 3 Confusion. Bocar vs. VW Germany |
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| vamram wrote: |
| The German jets will not fit that particular Bocar. Be careful, I 86'd my nice Mexican Bocar like yours by messing up the threads on the idle jet - I used an idle jet from a chinese after-market version of the same "sherryberg" carb and damaged the threads because the pitch (?) of the threads was not the same between the two carbs. |
That was my next question--where does one get new jets for the Bocar carbs, since the Solex jets don't fit.
I thought spending $28 for a used Solex was rather extravagant (I'm that cheap...) but I'm thinking it was a good deal since I can swap out to the larger jet size that I'll need because of the corn juice gasoline they sell in Washington. |
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kreemoweet
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Joined: March 13, 2008
Posts: 4133
Location: Seattle, WA
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| Posted: Fri Nov 14, 2025 9:19 pm Post subject: Re: 34-PICT 3 Confusion. Bocar vs. VW Germany |
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It looks like on one of those carbs, someone took the main jet (located in the float bowl) and put it where the idle jet was supposed to be. The main jet is the only jet in the float bowl on either carb. There is also a brass plug that keeps one of check valve balls for the accelerator pump in place in there.
The 34 PICT-3 came with a variety of jet sizes and vacuum drillings/fittings depending on the exact vehicle/engine it was used in. The Bentley manual for your vehicle will give the stock sizes of jets used by VW.
On all 34 PICT-3's I've seen, German or Mexican or Chinese, all the jet thread sizes have been the SAME.
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Cheburashka
Samba Member
Joined: July 10, 2018
Posts: 145
Location: WA
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| Posted: Yesterday 1:52 am Post subject: Re: 34-PICT 3 Confusion. Bocar vs. VW Germany |
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| kreemoweet wrote: |
| It looks like on one of those carbs, someone took the main jet (located in the float bowl) and put it where the idle jet was supposed to be. . |
If you mean the one on the left, that's a two part pilot/idle screw. What might look like amain jet is actually a solid plug. The pilot jet is mounted deeper in the passage.
| kreemoweet wrote: |
| On all 34 PICT-3's I've seen, German or Mexican or Chinese, all the jet thread sizes have been the SAME. |
On these they're definitely different. The thread difference is easily visible. |
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glutamodo
The Android
Joined: July 13, 2004
Posts: 26598
Location: Douglas, WY
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| Posted: Yesterday 4:47 am Post subject: Re: 34-PICT 3 Confusion. Bocar vs. VW Germany |
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I've heard about that variant of 34PICT-3, never saw one in person. I suspect those were intended for Mexico production line cars and were altered for emissions.
All of the BOCAR 34PICT-3s I have seen were probably intended for export/aftermarket away from Mexico and those are more of the German design.
I have one here somewhere, I just dug it out, the top is damaged and I remember now that I mucked around with it a bit. 3590 stamp on the base flange which might be week 35 of 1990. (I have an NOS BOCAR 30PICT-1 with date stamps of 2277 on both the base flange and the choke element, and I've seen another that says 5079, which both work as that kind of date stamp)
Anyway, my 3590 34PICT-3 has the normal jets, and the spot where that upwards facing jet in the bowl, is just a small bowl shaped depression in the casting.
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"What is Glutamodo, Horror of Toyko, besides total, fiendish, quality-a-you brain!" |
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vamram
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Joined: March 08, 2012
Posts: 8194
Location: NOVA
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| Posted: Yesterday 6:25 am Post subject: Re: 34-PICT 3 Confusion. Bocar vs. VW Germany |
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| glutamodo wrote: |
I've heard about that variant of 34PICT-3, never saw one in person. I suspect those were intended for Mexico production line cars and were altered for emissions.
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This is it. It is a variation of the original VW 34-3 with different idle and main jets and threading. The Bocar one he posts originally also had second throttle arm that worked a dashpot piped to the lower rear right port on the carb. And a 2nd small jet in the main bowl where the US-spec 34-3 had a plug.
BTW, I picked one up NOS at one of the last Bug Outs in NoVA back in '12. I ran it for a few years. I could never find alternate jets for it. Here it is installed in my '72 Super over a decade ago.
_________________
"Men are qualified for civil liberty in exact proportion to their disposition
to put moral chains upon their own appetites. -Edmund Burke
'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...we hardly knew ye. Sold 2025 for peanuts.
Click to view image
Save the Supers!! |
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glutamodo
The Android
Joined: July 13, 2004
Posts: 26598
Location: Douglas, WY
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| Posted: Yesterday 9:10 am Post subject: Re: 34-PICT 3 Confusion. Bocar vs. VW Germany |
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Dashpots are passive, no hoses going to them. What that carb has is a throttle positioner. And, being reminded of that, I have seen those in person before, but I've never actually taken one apart or worked on it.
There was a time before that custom jetting stuff happened when BOCAR carburetors did have a dashpot.
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Andy T.
"What is Glutamodo, Horror of Toyko, besides total, fiendish, quality-a-you brain!" |
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vamram
Samba Member
Joined: March 08, 2012
Posts: 8194
Location: NOVA
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| Posted: Yesterday 9:58 am Post subject: Re: 34-PICT 3 Confusion. Bocar vs. VW Germany |
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The way it works (worked) on mine is it slowed the snap back to idle when you released the accelerator. I coul adjust the speed with the screw on the crossbar (?) of the throttle return spring linkage.
_________________
"Men are qualified for civil liberty in exact proportion to their disposition
to put moral chains upon their own appetites. -Edmund Burke
'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...we hardly knew ye. Sold 2025 for peanuts.
Click to view image
Save the Supers!! |
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Cheburashka
Samba Member
Joined: July 10, 2018
Posts: 145
Location: WA
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| Posted: Yesterday 3:46 pm Post subject: Re: 34-PICT 3 Confusion. Bocar vs. VW Germany |
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| Well, just for fun, I ordered some Keihin jets in a 4mm size. I think they'll fit the Bocar and allow for some adjustment. I generally like to have an extra carb lying around, just in case. |
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Bobs67vwagen
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Joined: March 27, 2005
Posts: 788
Location: Eastern north carolina
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| Posted: Yesterday 6:44 pm Post subject: Re: 34-PICT 3 Confusion. Bocar vs. VW Germany |
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| That sounds interesting-japanese jets in a Mexican copy of a german carburetor. I am looking forward to the results. |
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