Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
Carb by pass screw
Forum Index -> Beetle - 1958-1967 Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
hale6968
Samba Member


Joined: August 19, 2014
Posts: 41
Location: Cleveland Ohio
hale6968 is offline 

PostPosted: Mon Mar 15, 2021 5:34 pm    Post subject: Carb by pass screw Reply with quote

What is the purpose of the large brass bypass screw above the volume screw on passenger side of a pict 30? Thanks
Back to top
View user's profile Send private message Classifieds Feedback
KTPhil Premium Member
Samba Member


Joined: April 06, 2006
Posts: 34812
Location: Conejo Valley, CA
KTPhil is offline 

PostPosted: Tue Mar 16, 2021 9:58 am    Post subject: Re: Carb by pass screw Reply with quote

What is the complete model of your carb (-1 or -2)?

Nothing on the passenger side I know of, unless your car is RHD.

Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
glutamodo Premium Member
The Android


Joined: July 13, 2004
Posts: 26415
Location: Douglas, WY
glutamodo is offline 

PostPosted: Tue Mar 16, 2021 11:46 am    Post subject: Re: Carb by pass screw Reply with quote

hale6968 wrote:
What is the purpose of the large brass bypass screw above the volume screw on passenger side of a pict 30? Thanks


Now, there ARE NO adjustment screws on the passenger side (USA, left hand drive) side of the carburetor. As you sit in the driver's seat, one side of the car is left, the other right. You should use that as your orientation when you talk about where stuff is on the vehicle.

Now, it sounds to me like you are talking LEFT side of the carburetor, and if you have a Large Screw, that would be a 30PICT-3 or it's derivative, the H30/31PICT. (or a 34PICT-3 if you have a later engine) In all of these the big screw basically lets air past the throttle butterfly (which in such carbs, needs to be set so that it is SHUT when the choke is backed off) and functions as the idle speed setting. The smaller screw affects "some" of the idle mixture enough so to allow for emissions adjustments.


Image may have been reduced in size. Click image to view fullscreen.


Image may have been reduced in size. Click image to view fullscreen.

_________________
Andy T.

"What is Glutamodo, Horror of Toyko, besides total, fiendish, quality-a-you brain!"
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
hale6968
Samba Member


Joined: August 19, 2014
Posts: 41
Location: Cleveland Ohio
hale6968 is offline 

PostPosted: Tue Mar 16, 2021 5:29 pm    Post subject: Re: Carb by pass screw Reply with quote

Thanks to both. Yes I screwed it up. It is on the left of drivers side of my 34Pict 1. Thanks for the help.
Back to top
View user's profile Send private message Classifieds Feedback
glutamodo Premium Member
The Android


Joined: July 13, 2004
Posts: 26415
Location: Douglas, WY
glutamodo is offline 

PostPosted: Tue Mar 16, 2021 11:42 pm    Post subject: Re: Carb by pass screw Reply with quote

Hah, well there is no such thing as a 34PICT1.

The German Carburetor Company (DVG) made the following carburetors for VW:

28 PCI
28 PICT
28 PICT-1
28 PICT-2 (non-USA 1200 model)
30 PICT-1
30 PICT-2
30 PICT-3 (1970 USA 1600 SP version type 1 and type 2)
30 PICT-3 revised (non USA 1200 type 1 model)
34 PICT-3
34 PICT-4

Now most of these had variations. Starting in the 28PICT-1 range "modification state numbers" appeared on carbs, these denoted specific build spec applications. And VW had a LOT of them.

In the aftermarket, you get all kinds of naming on carburetors. H30/31PICT is one bastard-child carb that is fairly common.

Now, I have long wished someone would make a 34PICT-1, that is , a 34 series carburetor that was built like the 30PICT-1, the last simple carburetor that DVG made for VW before they started mucking about with emissions.
_________________
Andy T.

"What is Glutamodo, Horror of Toyko, besides total, fiendish, quality-a-you brain!"
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Beetle - 1958-1967 All times are Mountain Standard Time/Pacific Daylight Savings Time
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2024, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB
Links to eBay or other vendor sites may be affiliate links where the site receives compensation.