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fl59bug
Samba Member
Joined: November 23, 2005
Posts: 2065
Location: North Carolina
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 Posted: Thu Mar 22, 2007 6:03 pm Post subject: 30 pict-2 on a 40 horse |
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My '59 bug is running a 1200cc 40 hp motor with a very worn Solex Bocar 30 pict-1 carb. A friend gave me a manifold and 30 pict-2 off a 1600cc single port engine. I know the manifold is physically too large to use on my 1200cc, but would the 30 pict-2 carb fit on my current intake manifold, and even if it did, would this be too much gas being dumped in my 1200cc? The car has good acceleration but has a certain "thump" at idle that I believe may be carb-related. Everything else is in tune, valves are adjusted, timing and point gap set. As I mentioned, the car accelerates fine, just doesn't idle well. I figure since I got a free carb I'd at least see if this "new" carb might make a difference!
Oh, and the 30 pict-1 on the car was rebuilt a while back by yours truly but the fuel volume screw seems to have no effect on the idle no matter how I try to adjust it! |
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Seb67
Samba Member
Joined: December 02, 2003
Posts: 1009
Location: New England
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| Posted: Thu Mar 22, 2007 6:07 pm Post subject: Re: 30 pict-2 on a 40 horse |
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| fl59bug wrote: |
My '59 bug is running a 1200cc 40 hp motor with a very worn Solex Bocar 30 pict-1 carb. A friend gave me a manifold and 30 pict-2 off a 1600cc single port engine. I know the manifold is physically too large to use on my 1200cc, but would the 30 pict-2 carb fit on my current intake manifold, and even if it did, would this be too much gas being dumped in my 1200cc? The car has good acceleration but has a certain "thump" at idle that I believe may be carb-related. Everything else is in tune, valves are adjusted, timing and point gap set. As I mentioned, the car accelerates fine, just doesn't idle well. I figure since I got a free carb I'd at least see if this "new" carb might make a difference!
Oh, and the 30 pict-1 on the car was rebuilt a while back by yours truly but the fuel volume screw seems to have no effect on the idle no matter how I try to adjust it! |
I currently have a 30 pict-2 on my 40 and it runs like ass. Of course that could be because it's very dirty and needs a complete rebuild. But, in short - it will fit and will run. I'd try to fix the 30 pict-1 if I were you.
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1964 Type 1 |
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jake_vw
Samba Member
Joined: February 15, 2007
Posts: 172
Location: nor-cal
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| Posted: Thu Mar 22, 2007 10:54 pm Post subject: |
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| wowww im in the past. im running a 28 PICT...so you can swap to a 30 PICT 1 without killing birds and squirrels when you drive by |
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dailydrivervw
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Joined: November 05, 2005
Posts: 372
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| Posted: Fri Mar 23, 2007 5:27 am Post subject: |
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If you are after a perfect idle, the 30-2 is a poor choice. That carb was for 68-69 and the adjustment screw on the side is not an idle mixture setting; it is a volume control screw to set idle speed. The idle mixture is preset by design on the 30-2 and usually don't idle great.
The best carb for that motor is the orig 28 or you could use the OEM 66-67 30. |
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fl59bug
Samba Member
Joined: November 23, 2005
Posts: 2065
Location: North Carolina
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| Posted: Fri Mar 23, 2007 7:15 am Post subject: |
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I'd love to get hold of a functional 28 pict and vacuum advance distributor for this car, but of course I'm tinkering with what I already have first to see if it works 
As I mentioned I currently have the Solex Bocar 30 pict 1, and I had thought it to be from a 1966 bug, but someone else informed me this was an aftermarket carb. The 30 pict 2 has a "made in West Germany" on it, so it might be OEM, not sure.
Also as mentioned, the volume control lately seems to have no effect at all on the idle speed, which as the manual states, this volumn control screw as a starting point for adjusting idle should be turned all the way in until the idle starts to die, then backed out 2 or so turns.
I just don't know if this problem is related or not to the thumping idle of the car. |
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dailydrivervw
Samba Member
Joined: November 05, 2005
Posts: 372
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| Posted: Fri Mar 23, 2007 9:23 am Post subject: |
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Make sure the fast idle screw does not touch the lowest step on the fast idle cam, when up to operating temp. Then the volume screw should work, if the timing is correct. Also if you have the carb removed, make sure the inner throttle plate closes all the way. If someone installed the plate off-center it will not seal correctly.
Yes a 30-2 is OEM....68-69 only |
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fl59bug
Samba Member
Joined: November 23, 2005
Posts: 2065
Location: North Carolina
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| Posted: Fri Mar 23, 2007 6:16 pm Post subject: |
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| Thanks dailyDriverVW, I'll take a second look at the volume control screw doing as you metioned with the fast idle screw and making sure it is not touching the stepped cam when I try to adjust the volume setting. |
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keifernet
Samba Search & Rescue
Joined: May 11, 2002
Posts: 19395
Location: Samba Center for Behavioral Science
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| Posted: Fri Mar 23, 2007 6:48 pm Post subject: |
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| dailydrivervw wrote: |
Make sure the fast idle screw does not touch the lowest step on the fast idle cam, when up to operating temp. Then the volume screw should work, if the timing is correct. Also if you have the carb removed, make sure the inner throttle plate closes all the way. If someone installed the plate off-center it will not seal correctly.
Yes a 30-2 is OEM....68-69 only |
Isn't that for the 30 pict 3 and 34 pict 3 and 30/31 and not the 30 pict 2?
I have not ran across alot of 30 pict 2's lately and can't recall any different tuning methods... |
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dailydrivervw
Samba Member
Joined: November 05, 2005
Posts: 372
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| Posted: Sat Mar 24, 2007 5:25 am Post subject: |
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| Quote: |
keifernet Posted: Yesterday, 8:48 pm Post subject:
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dailydrivervw wrote:
Make sure the fast idle screw does not touch the lowest step on the fast idle cam, when up to operating temp. Then the volume screw should work, if the timing is correct. Also if you have the carb removed, make sure the inner throttle plate closes all the way. If someone installed the plate off-center it will not seal correctly.
Yes a 30-2 is OEM....68-69 only
Isn't that for the 30 pict 3 and 34 pict 3 and 30/31 and not the 30 pict 2?
I have not ran across alot of 30 pict 2's lately and can't recall any different tuning methods...
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The adjustment screw on the side of the 30-2 looks like a idle mixture screw, but it is not. It is a volume control adjustment. There is no way to adjust the idle mixture on a 30-2. There must be a website out there that gets into the idle circuit differences of these early smog carbs like 30-2, 30-3, & 34's.
The 30-2 cars sometimes had "less than perfect idle quality" even back when they were almost new. I did own a 68 back in 71, and as I recall, the idle was Ok; but just like comparing 34 carbs, some are fine and some just can't be made to run correctly. Then add almost 40 years of wear, internal corrosion, etc, and that makes a lot of 30-2s unworkable. Mainly because they have no idle mixture adjustment.
When new, back in the day, the 30-1 and 30-3 were the best vw carbs as far as tunability and drivability for the bigger motors starting in 1966. (they ran just as nice as the old 28's on the smaller motors). I have been running a 30-1 everyday for 3 years now, and it is the only VW that I have ever had that has a great idle (hot or cold), and starts instantly in zero degree weather, and also never stalls during warm ups when left unattended. I would have used a 30-3, but at the time I could not find a good core that did not have white corrosion in the bowl from water.
BTW, the preheat system for the carb air seems to be "must-have" now more than ever; perhaps due to the changing blends of fuel these days. A lot of people put up with all sorts of running issues by not realizing that a working preheat will cure many of them. |
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glutamodo 
The Android
Joined: July 13, 2004
Posts: 26524
Location: Douglas, WY
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| Posted: Sat Mar 24, 2007 7:43 am Post subject: |
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| I've stated this about the 30PICT-2 many times here. I don't like them. Ever try to remove or adjust that little metering screw? Usually it cannot be budged - I'm pretty sure by design, as VW didn't want anyone messing with it once set. The problem that I think some people run into is that if there's any kind of crud in that part of the carb, you cannot remove that metering screw to make sure those passenges got blown clean. Some of those carbs just won't run at all, in my experience. I won't use them, I threw out the ones I used to own a long time ago. Gimme a 30PICT-1 any day instead. |
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fl59bug
Samba Member
Joined: November 23, 2005
Posts: 2065
Location: North Carolina
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| Posted: Sat Mar 24, 2007 6:48 pm Post subject: |
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Well, now that I've had a couple of mid 80 degree days to drive my car now (still with the rough idle 30-pict1) I've tried to adjust that volume control screw with the fast idle screw disengaged from the cam, and it still has no effect whatsoever on the fuel volume, as evidenced by no change in the engine speed. There really must be something wrong with this volume control screw.
Also the car diesels pretty bad once I shut it off. I've set the timing, but will recheck it since maybe the hotter days have had some effect on the carb and idle and hence changed the static timing. Any ideas?
It sounds like swapping the 30 pict-1 for the "2" may not be such a great idea, so I've got to get my "1" to work. |
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