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Zundfolge1432 
Samba Member
Joined: June 13, 2004
Posts: 12468
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 Posted: Wed Sep 28, 2016 4:02 pm Post subject: 34-4 PICT California |
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Anybody have experience or thoughts on this carb? I've seen them a few times but its been awhile. This was a California only carb late 74? . I remember seeing the intake which was also unique using dual heat risers and associated tin, pretty rare stuff now. Thanks in advance.
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wcfvw69
Samba Purist
Joined: June 10, 2004
Posts: 13389
Location: Arizona
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| Posted: Wed Sep 28, 2016 5:18 pm Post subject: Re: 34-4 PICT California |
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Andy (glutamodo) seems to be the resident Solex guru on this site. As you mentioned, it's a 74' only carb for California. I bet that baby runs LEAN to say the least to meet Cali's smog regulations.
I'm going to be following this thread. It would be interesting to know more about that carb.
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wcfvw69
Samba Purist
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Location: Arizona
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| Posted: Wed Sep 28, 2016 5:24 pm Post subject: Re: 34-4 PICT California |
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http://www.thesamba.com/vw/forum/viewtopic.php?p=4397042
I was curious about this carb and found this excellent thread.
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Contact me at [email protected]
Follow me on instagram @sparxwerksllc
Decades of VW and VW parts restoration experience.
The Samba member since 2004.
**Now rebuilding throttle bodies for VW's and Porsche's**
**Restored German Bosch distributors for sale or I can restore yours**
**Restored German Pierburg fuel pumps for sale or I can restore yours**
**Restored Porsche fuel pumps or I can restore yours**
**Restored Porsche distributors or I can restore yours** |
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glutamodo
The Android
Joined: July 13, 2004
Posts: 26325
Location: Douglas, WY
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| Posted: Wed Sep 28, 2016 6:03 pm Post subject: Re: 34-4 PICT California |
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If you read German, there's a DVG (the company that actually made these for VW) manual that discusses the PICT-4 series a bit, in theSamba archives:
http://www.thesamba.com/vw/archives/manuals/solex_30_34_german.php
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Andy T.
IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
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rockerarm
Samba Member
Joined: December 16, 2009
Posts: 3552
Location: Los Angeles
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| Posted: Thu Sep 29, 2016 8:06 am Post subject: Re: 34-4 PICT California |
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Hi. I actually like this carb. On the carb's left side was a temp valve that would reduce the accel pump output when warm. We used to put an o-ring from the carb rebuild kit in this valve's groove and this simply blocked the fuel from being diverted back into the float bowl. This allowed the same amount of gas available for the acceleration pump circuit when warm as it did when cold. It helped with the flatspot condition.
Bill |
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vamram
Samba Member
Joined: March 08, 2012
Posts: 7307
Location: NOVA
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| Posted: Thu Sep 29, 2016 8:55 am Post subject: Re: 34-4 PICT California |
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I have one of these rebuilt by volkbitz. I like it and it got great mpg on my Miami road trip last year 35/gal during one 330+ mile stretch - but it idles kinda rough. I switched back to a bocar 34-3 that I've been very happy with for the last year.
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'74 Super 9/16 - present, in refurb process.
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Boble
Samba Member
Joined: November 13, 2005
Posts: 744
Location: Oslo, Norway
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| Posted: Thu Sep 29, 2016 3:16 pm Post subject: Re: 34-4 PICT California |
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| Zundfolge1432 wrote: |
Anybody have experience or thoughts on this carb? I've seen them a few times but its been awhile. This was a California only carb late 74? . I remember seeing the intake which was also unique using dual heat risers and associated tin, pretty rare stuff now. Thanks in advance.
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I like this carb, it's rare.Take good care of it - historical piece 
The dual heat risers were another improvement that came with the latest carburator version cars. I think it was from 1975(?). Anyways, heats up the intakes faster. Good struff! |
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Boble
Samba Member
Joined: November 13, 2005
Posts: 744
Location: Oslo, Norway
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| Posted: Thu Sep 29, 2016 3:25 pm Post subject: Re: 34-4 PICT California |
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| vamram wrote: |
| I have one of these rebuilt by volkbitz. I like it and it got great mpg on my Miami road trip last year 35/gal during one 330+ mile stretch - but it idles kinda rough. I switched back to a bocar 34-3 that I've been very happy with for the last year. |
The idle circuit on the 34 PICT-4 is the same as 34 PICT-3. Idling is a challenge on these since it tends to run too lean. If it does not idle perfectly (mine didn't), I can recommend to do some tweeks:
- Plug the little hole on the throttle valve plate
- Increase the Idle Jet to .60
- Main Jet from 127.5 to 130 or higher
Remember to re-adjust the Bypass and Volume Control screws. Should work fine now if the rest of the engine is tuned right. |
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Boble
Samba Member
Joined: November 13, 2005
Posts: 744
Location: Oslo, Norway
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| Posted: Thu Sep 29, 2016 3:36 pm Post subject: Re: 34-4 PICT California |
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| rockerarm wrote: |
Hi. I actually like this carb. On the carb's left side was a temp valve that would reduce the accel pump output when warm. We used to put an o-ring from the carb rebuild kit in this valve's groove and this simply blocked the fuel from being diverted back into the float bowl. This allowed the same amount of gas available for the acceleration pump circuit when warm as it did when cold. It helped with the flatspot condition.
Bill |
Sure, but then you disable the functions of the temperature compensated accelerator pump, which was an imrovement.
Correctly adjusted the 34-PICT 4 accelerator pump gives 1.9 ml at cold engine, 1.1 ml at warm = more correct fuel mixture.
The simpler 34-PICT 3 gives 0.16 ml at all temperatures, which may be a little too lean when cold, and a little too rich at warm engine.
My experience from playing with these carbs are that flat spot is better dealt with by increasing the Pilot (Idle) Jet to .60. |
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 12728
Location: on a bike ride somewhere
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| Posted: Thu Sep 29, 2016 4:02 pm Post subject: Re: 34-4 PICT California |
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I don't understand how some say any 34pict carb can "idle too lean." What is the idle mixture adjusting screw doing in this case? I'd really love to see a demonstration with an O2 meter hooked up to one of those engines in that case.
Robbie
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vamram
Samba Member
Joined: March 08, 2012
Posts: 7307
Location: NOVA
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| Posted: Thu Sep 29, 2016 5:57 pm Post subject: Re: 34-4 PICT California |
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| Boble wrote: |
| vamram wrote: |
| I have one of these rebuilt by volkbitz. I like it and it got great mpg on my Miami road trip last year 35/gal during one 330+ mile stretch - but it idles kinda rough. I switched back to a bocar 34-3 that I've been very happy with for the last year. |
The idle circuit on the 34 PICT-4 is the same as 34 PICT-3. Idling is a challenge on these since it tends to run too lean. If it does not idle perfectly (mine didn't), I can recommend to do some tweeks:
- Plug the little hole on the throttle valve plate
- Increase the Idle Jet to .60
- Main Jet from 127.5 to 130 or higher
Remember to re-adjust the Bypass and Volume Control screws. Should work fine now if the rest of the engine is tuned right. |
Won't gas mileage suffer with those mods? And I'm using a DVDA distributor which requires the hole in the throttle plate.
_________________
Eventually, "we are what we pretend to be.’”
Give peace a chance - Stop Russian-Soviet Aggression!!
'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...waiting it's turn in line behind '74.
Click to view image
Save the Supers!! |
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60ragtop
Bonneville Belt Bitch
Joined: March 13, 2006
Posts: 7800
Location: Big Wonderful WYO 82401
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| Posted: Thu Sep 29, 2016 6:07 pm Post subject: Re: 34-4 PICT California |
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here's a recent thread, maybe he can supply more info
http://www.thesamba.com/vw/forum/viewtopic.php?t=641303&start=0
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Certified Mechanic by the State of Michigan in 1977
ASA certified in 1987
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| tasb wrote: |
I've restored a large number too, but I don't toot my horn quite as loud.
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| sb001 wrote: |
maybe he just snapped cause his car sucked  |
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 51156
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Thu Sep 29, 2016 6:26 pm Post subject: Re: 34-4 PICT California |
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| vamram wrote: |
| Boble wrote: |
| vamram wrote: |
| I have one of these rebuilt by volkbitz. I like it and it got great mpg on my Miami road trip last year 35/gal during one 330+ mile stretch - but it idles kinda rough. I switched back to a bocar 34-3 that I've been very happy with for the last year. |
The idle circuit on the 34 PICT-4 is the same as 34 PICT-3. Idling is a challenge on these since it tends to run too lean. If it does not idle perfectly (mine didn't), I can recommend to do some tweeks:
- Plug the little hole on the throttle valve plate
- Increase the Idle Jet to .60
- Main Jet from 127.5 to 130 or higher
Remember to re-adjust the Bypass and Volume Control screws. Should work fine now if the rest of the engine is tuned right. |
Won't gas mileage suffer with those mods? And I'm using a DVDA distributor which requires the hole in the throttle plate. |
I would think so, sounds like a band aid to cover loose throttle shaft bushings and improperly cleaned idle passages. I can make mine puff black smoke if I feel the need with stock jets and the hole in the plate.
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wcfvw69
Samba Purist
Joined: June 10, 2004
Posts: 13389
Location: Arizona
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| Posted: Thu Sep 29, 2016 6:30 pm Post subject: Re: 34-4 PICT California |
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| asiab3 wrote: |
I don't understand how some say any 34pict carb can "idle too lean." What is the idle mixture adjusting screw doing in this case? I'd really love to see a demonstration with an O2 meter hooked up to one of those engines in that case.
Robbie |
Not to mention you can bump up the pilot jet for more fuel during idle.
_________________
Contact me at [email protected]
Follow me on instagram @sparxwerksllc
Decades of VW and VW parts restoration experience.
The Samba member since 2004.
**Now rebuilding throttle bodies for VW's and Porsche's**
**Restored German Bosch distributors for sale or I can restore yours**
**Restored German Pierburg fuel pumps for sale or I can restore yours**
**Restored Porsche fuel pumps or I can restore yours**
**Restored Porsche distributors or I can restore yours** |
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 12728
Location: on a bike ride somewhere
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| Posted: Thu Sep 29, 2016 8:16 pm Post subject: Re: 34-4 PICT California |
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| wcfvw69 wrote: |
| asiab3 wrote: |
I don't understand how some say any 34pict carb can "idle too lean." What is the idle mixture adjusting screw doing in this case? I'd really love to see a demonstration with an O2 meter hooked up to one of those engines in that case.
Robbie |
Not to mention you can bump up the pilot jet for more fuel during idle. |
I showed up to a car recently where the owner was convinced that they had an oil pressure issue, (wanted to buy a pump,) electrical issue, (wanted to buy an alternator,) and a hesitation issue, (wanted to buy a carb.)
The mixture screw was fully seated and it was running so lean that the warm idle would bog down to about 350-400 rpm and light up both the idiot lights. 
Sometimes all it takes is a little talk with the car. Ask it what it needs. Don't just blindly follow instructions without asking "why" you're doing what you're doing and "why" you're getting the results you are.
Robbie
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