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hale6968
Samba Member
Joined: August 19, 2014
Posts: 41
Location: Cleveland Ohio
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 Posted: Mon Mar 15, 2021 5:34 pm Post subject: Carb by pass screw |
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| What is the purpose of the large brass bypass screw above the volume screw on passenger side of a pict 30? Thanks |
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KTPhil 
Samba Member
Joined: April 06, 2006
Posts: 34452
Location: Conejo Valley, CA
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| Posted: Tue Mar 16, 2021 9:58 am Post subject: Re: Carb by pass screw |
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What is the complete model of your carb (-1 or -2)?
Nothing on the passenger side I know of, unless your car is RHD.
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glutamodo
The Android
Joined: July 13, 2004
Posts: 26387
Location: Douglas, WY
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| Posted: Tue Mar 16, 2021 11:46 am Post subject: Re: Carb by pass screw |
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| 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.
_________________
Andy T.
"What is Glutamodo, Horror of Toyko, besides total, fiendish, quality-a-you brain!" |
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hale6968
Samba Member
Joined: August 19, 2014
Posts: 41
Location: Cleveland Ohio
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| Posted: Tue Mar 16, 2021 5:29 pm Post subject: Re: Carb by pass screw |
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| Thanks to both. Yes I screwed it up. It is on the left of drivers side of my 34Pict 1. Thanks for the help. |
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glutamodo
The Android
Joined: July 13, 2004
Posts: 26387
Location: Douglas, WY
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| Posted: Tue Mar 16, 2021 11:42 pm Post subject: Re: Carb by pass screw |
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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!" |
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