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volksbug70
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Joined: August 22, 2005
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Location: Tallahassee, FL
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 Posted: Sun May 23, 2010 11:12 pm Post subject: Idle and Power Jets on 30-PICT-3 |
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Okay, just to confirm, the red arrow points to the IDLE jet and the yellow arrow points to the POWER jet on this 30-PICT-3 carburetor in my 1970 Standard MT, 1600SP, right?
<-- Rear of car <--
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Last edited by volksbug70 on Sat Jun 05, 2010 9:26 am; edited 1 time in total |
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Greezy Joe
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| Posted: Mon May 24, 2010 11:42 am Post subject: |
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Can't see the pic but there is no power jet. There is an accel pump.
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volksbug70
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Joined: August 22, 2005
Posts: 126
Location: Tallahassee, FL
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| Posted: Mon May 24, 2010 1:45 pm Post subject: |
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I'm pretty sure it does, and Rob and Dave seem to think so as well:
| http://www.vw-resource.com/jets.html#aux wrote: |
| Note: There is no power jet on the 28 series carburettors or on the first 30 series carburettors, but later 30PICT/1s, and all 30PICT/2, 30PICT/3, 34PICT/3 or /4 and H30/31 carburettors have an Auxiliary or Power jet. |
I guess it's also called the "auxiliary" jet, too.
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katalla
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Location: los angeles
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| Posted: Mon May 24, 2010 4:57 pm Post subject: |
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| the yellow one is for cut off valve special to that carb the red is the idle jet |
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David Raistrick
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Joined: January 26, 2004
Posts: 634
Location: Geneva, Florida
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| Posted: Sat Sep 29, 2012 7:52 pm Post subject: Re: Idle and Power Jets on 30-PICT-3 |
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| volksbug70 wrote: |
Okay, just to confirm, the red arrow points to the IDLE jet and the yellow arrow points to the POWER jet on this 30-PICT-3 carburetor in my 1970 Standard MT, 1600SP, right?
<-- Rear of car <-- |
It's a thread resurrection, but since no one else actually answered and I spent the time today to figure it out for sure (which is how I found this thread):
Yes - on the 30pict3 and H30/31, the straight (front, yellow) jet is the power/aux fuel jet (generally .65). The angled (rear, red) jet is the pilot/idle jet (generally .50 for beetles, .60 for buses)
Ignore the naysayers who don't realize that the 30pict3 is different from the 30pict2. 
If you want to confirm it for yourself - the idle jet (on -all- carbs with an idle/pilot jet) ends up exiting in a small hole just above the throttle butterfly (and hooked into the various idle adjustment circuits). The power jet (unique for our carbs to 30pict3, h30/31, and 34pict*) ends in a big hole just below the main delivery tube, up high in the throat)
FWIW for the next searcher... |
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sssingletrack
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Joined: September 27, 2012
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Location: UK
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| Posted: Sat Sep 29, 2012 11:52 pm Post subject: |
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I found the opposite myself. If you swap the two round the air bypass screw has to be much further out with a 50 in the port to the Front and the 60(in my case) on the rear.
Meaning the one to the front has to be the idle, as the power jet doesn't come into play until high revs.
That's on a 31 PICT 3 |
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jgrexx
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jgrexx
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David Raistrick
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Joined: January 26, 2004
Posts: 634
Location: Geneva, Florida
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| Posted: Sat Jan 18, 2025 7:04 pm Post subject: Re: Idle and Power Jets on 30-PICT-3 |
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| David Raistrick wrote: |
Yes - on the 30pict3 and H30/31, the straight (front, yellow) jet is the power/aux fuel jet (generally .65). The angled (rear, red) jet is the pilot/idle jet (generally .50 for beetles, .60 for buses)
If you want to confirm it for yourself - the idle jet (on -all- carbs with an idle/pilot jet) ends up exiting in a small hole just above the throttle butterfly (and hooked into the various idle adjustment circuits). The power jet (unique for our carbs to 30pict3, h30/31, and 34pict*) ends in a big hole just below the main delivery tube, up high in the throat)
FWIW for the next searcher... |
following up on this because someone asked me:
specifically for the 34pict3, the idle (pilot) is the straight 8mm hex head jet on the choke side.
the power (aux fuel) jet is the small slot head screw next to and toward the rear of the idle jet.
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kreemoweet
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Joined: March 13, 2008
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| Posted: Sat Jan 18, 2025 8:46 pm Post subject: Re: Idle and Power Jets on 30-PICT-3 |
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To All: Please stop referring to the auxilliary idle jet as the "power" jet. That is mistaken nomenclature propagated by the Rob & Dave's Aircooled Volkswagen Pages (among others), along with some other bogus info there. The only "power" jet(s) in the diagram above are the 2 #19 nozzles, which are part of the fuel enrichment circuit, and not anything to do with the idle circuit.
Also, be aware that there is lots of misinformation given in the posts above, as to the names of jets, their locations, and their relative sizes.
It has been firmly established, via documents published by the carb manufacturer, that on the carbs with 2 external idle jets, the one angled at the rear is the "idle" jet, and it is invariably the larger of the two, even though the absolute sizes have varied considerably from one engine application to another.
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David Raistrick
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Joined: January 26, 2004
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| Posted: Sat Jan 18, 2025 9:11 pm Post subject: Re: Idle and Power Jets on 30-PICT-3 |
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| kreemoweet wrote: |
| To All: Please stop referring to the auxilliary idle jet as the "power" jet. |
thanks. so you call it the "auxillary idle jet" but it other documents call it the "auxillary fuel jet"
if this jet is part of the idle circuit, why does it's outlet end up (on the 30/31, at least, in my personal testing) above the butterfly in _exactly_ the #19 nozzles? (differently numbered on a 30/31 chart, but)
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glutamodo 
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Joined: July 13, 2004
Posts: 26533
Location: Douglas, WY
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| Posted: Sun Jan 19, 2025 4:18 pm Post subject: Re: Idle and Power Jets on 30-PICT-3 |
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The entire problem here is that VW did not know how to translate their German terms for the split idle circuit. They called it "additional", "excess" or, most commonly, "Auxilary" for the 2nd idle fuel and idle air jets. Somewhere along the way, someone not affiliated with VW decided they would call the 2nd circuit "power" when it's IS NOT. Is just one half of the split idle circuit!
Compounding this the high speed Enrichment circuit. This existed long before they split the idle circuit into two paths (they did that split for finer emissions control, by the way), and VW themselves were translating the Enrichment circuit the Power Fuel System since the early 60s. THAT is for power, it only works at high vacuum (high RPMs) ON PICT-1 and PICT-2 carburetor, there was one such outlet. On the PICT-3, there were two power fuel jets.
As far as jet sizes given in those images above. Well those are my images of VW literature. However there were a lot of 30PICT-3, and 31PICT-3 carburetors. 30PICT-3 started on the 1600SP. The next year it got redesigned with the plunger style idle cutoff solenoid and was only used on the non-USA 1200 after that. The 31PICT-3 was for the non-USA 1300 dual port engines. ( And the aftermarket H30/31PICT was mostly a copy of the early 70s 1200 30PICT-3. ) Anyway, there were MANY jet combinations. These are some of them.
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