TheSamba.com :: View topic - Comparing stock Solex carbs to each other, and to the H30/31

Fri Dec 02, 2011 5:29 am

you are absolutely correct. No power fuel system on either one, and although the lower part of the carb body has the drillings for the power fuel system, the place for the power jet has been capped off.

The upper part of the carb does not have the port for the system.

I forgot to mention the jet sizes:

Main jet x125
Air correction 125z
Idle 55

for both models

Fri Dec 02, 2011 10:08 am

Yeah, those are what my chart shows as well. Are these on a 1300SP then? I probably would not want to use them on anything larger. Those 1300-series 30PICT-1 and 30PICT-2s trade off the lack of power fuel system with a larger main jet. I drove my "1400" big bore 34bhp engine once with a 28PICT-2 whose power fuel system was plugged off, and it was horrible at highway speeds.. it would have needed a larger main jet to compensate.

I'll add the no power fuel system info to my chart for the later carb. thanks for the confirmation.

-Andy

Tue Dec 06, 2011 6:53 am

Yes, 1300 Single Port.

Fri Dec 09, 2011 10:48 am

Sorry to revive a post but glad I searched and found it.
With the information I can and will correct the distributor and carb on my engine. 68 stock 1500cc yes it has not been rebuilt. I am gonna ditch the brosol 30/31 and put on the 30pict-2 and the 205T distributor.

Sat Dec 17, 2011 7:06 am

Searched this thread up myself while looking for info....looking at a new/used carb and there seem to be TOO many to choose from.
I bought the AC.net SVDA distributor about three years ago...I can't remember for sure but from reading this thread, I'm almost positive that I bought the one designed for the H30/31 since that's what my 1600DP came with and since AC.net has you to choose the type of carb you're running before ordering the distributor.
I'll be keeping my SVDA so with that in mind, I suppose I should go with another H30/31?
Worst that can happen is that I'll be running centrifugal advance only...right?

Thu Dec 22, 2011 11:33 pm

6 pages of outstanding info! Let me pose this question.... 1600sp with sp kadrons properly jetted...which dizzy would you run...and why?

Sun Jan 29, 2012 8:26 am

I am wondering if anyone knows which throttle plate pictured below goes with which German 34pict-3 carb.

I assume that one is for a carb with one advance drilling and one is for a carb with two advance drillings... anyone know which is which? Note - ignore the over-sized hole on the right - that was a DVDA plate that I drilled the hole larger on. I know about the difference in hole sizes from SVDA to DVDA but am wondering about the one or two milled out sections on the throttle plates which correspond to the holes in the carb body.

From my 3 carb bodies it seems to be that the throttle plate with 2 milled out sections goes to a carb body with one advance drilling... but that's only a sample of 3 carbs and who knows how much mixing and matching has happened to them.. It also seems that the single advance drilling was on more later carbs so I'm wondering if it was deemed to be a better system.

Thanks!

Sun Jan 29, 2012 3:02 pm

To date I've tracked down around 60 different versions of the 34PICT-3 that I have information on, and I know there are others out there that I have yet to find - however the throttle butterfly is not part of that data and I've never tried to document it. Mostly I notice the size and location of the hole. (I'm also starting to distrust one of my sources regarding the existance of two "varietes" of some of the 400 series carbs.) But as far as those "steps" on the upper side of that butterfly, I've never seen any documentation about it.

On the 4 different 34s I have available to me right now, just looked and no clear pattern emerges as to "one step vs two steps" on the top side of the butterfly. I'm not going to take them apart, and they aren't very easy to photograph assembled so I'll merely list what I found:

325_2 - 1 step - 2 lower drillings - DVDA size hole near center
377_1 - 2 steps - 1 lower drilling - DVDA size hole, near center
410_1 - 2 step - 2 lower drillings - SVDA size hole, near center (EDITED - originally I miscopied my notes and said one)
BOCAR- 2 steps - 1 lower drilling- SVDA size hole, away from -center

The Bocar also has a butterfly with that slight file-like pattern on both sides instead of being smooth like the German ones, as you can see here:

And the other views, repeated from the initial post of this thread:

ONE UPPER STEP:

TWO UPPER STEPS:

TWO UPPER STEPS: (edited to fix typo, originally stated as one step)

TWO UPPER STEPS:

Mon Jan 30, 2012 5:15 pm

Great info - thanks again.

On my 3 carbs, the throttle plates with 2 steps corresponded to a single advance drilling in the carb body, and that seems to jive with your notes. So maybe that is a pattern..

Now if we only knew why some SVDA holes were near-center and some were away-from-center... on mine the hole is away-from-center and there are two steps... maybe when there's one step the hole is near-center?

Here's my notes:

377_1 - 2 steps - 1 lower drilling - DVDA size hole near center
325_2 - 1 step - 2 lower drillings - DVDA size hole near center
427_1 - 2 steps - 1 lower drilling - SVDA size hole away from center

Mon Jan 30, 2012 5:36 pm

Argh, when I wrote this down on paper there was no pattern, but due to me making a typo there was on the computer screen. But my note paper is still on the desk in front of me... ! I'm going to have to edit what I entered above... there was no pattern, as I meant to say that the 410_1 had TWO steps and two lower drillings..!!

After I post this I'll edit the above - but I'll leave in that it was edited.
-Andy

Mon Jan 30, 2012 5:39 pm

glutamodo wrote: Argh, when I wrote this down on paper there was no pattern, but due to me making a typo there was on the computer screen. But my note paper is still on the desk in front of me... ! I'm going to have to edit what I entered above... there was no pattern, as I meant to say that the 410_1 had TWO steps and two lower drillings..!!

After I post this I'll edit the above - but I'll leave in that it was edited.
-Andy

Aw shucks I was wondering how you would have missed that one... :lol:

Back to chaos...

Sun Apr 15, 2012 8:30 am

Great post! super informative.... :)

I just wish I had read it before I bought a brand new 30 pict 1 and a brand new SVDA distributor.... -Cause I am now feeling like I threw away a bunch of cash on exactly what I don't need... :(

I guess I was drawn in by this statement (off of CIP1.ca)

-Will work properly with any 13-1600cc Beetle, Bus or Ghia engine with the stock 30 or 34-PICT carburetor.... I guess I have been lied to.

But through them at least, my only other choice is a MSD or a 009...

My car has a 1500sp with a 30 pict 1 and a baja header.

If anyone has a link to the proper distributor for my engine, I would really appreciate it... Cheers!

Sun Apr 15, 2012 9:05 am

Yeah, that darn blanket statement from CIP again. :roll:

Which new 30PICT-1 did you get? There's the EMPI and there's the Euromax. I'm running the latter style on my 1600DP Baja.

30PICT-1s were factory matched to the 113905205K distributor. (0 231 137 009 - yes it ends in 009 but it's a different one) That's the one I'm running on my Baja. Although most vacuum-only distributors will work well with it.
-Andy

Sun Apr 15, 2012 10:30 am

I bought the EMPI 30 pict 1.... So now I know what I need to have, does anyone sell one new?

I only have access to crusty old junk, or 009 old junk..... Thanks for the help all....

Sun Apr 15, 2012 11:05 am

Ah, the EMPI... :?

When the EMPI 30PICT-1s first came out there were complaints of the vacuum signal out of them being incorrect... I was loaned a couple of them to check out and confirmed this. I don't know if they still have this issue though. Read more here:

http://www.thesamba.com/vw/forum/viewtopic.php?t=278191

I doubt you'll find anyone selling a 113905205K-0231137009 new. ( actually, the Bosch's later replacement for that one was the 315905205B-0231137031... I have a Bosch price book from 2003 that still listed it, but with an "O" code - which means it was obsolete, and a list price of $401.)
But any of the 1965-70 distributors will work, the 68-70 ones have more advance so their base timing is at TDC instead of 7.5BTDC. Lots of them used in theSamba Classifieds. (I think almost any Bosch VW units with the middle number of 137 will work, except the type 3s)

Crusty old junk? Sometimes you can find jewels once you scrape off the crust and polish a bit!

Actually though, you might try your mechanical 009 with your 30PICT-1 and see how it does, it may be fine - you've got a single port engine and they are usually more forgiving of that kind of distributor.

-Andy

Mon Apr 16, 2012 5:37 pm

Thanks for your help!