Stock dual carbs

ecdez · Post by **ecdez** » Tue Aug 10, 2004 7:04 am

Before I put the engine back in the car, I would like to get rid of the progressive that's on it now. I conveniently have a set of dual bus carbs that I can use for now. I dug them out yesterday only to find that the left and right sides are slightly different. The carb that goes on the drivers side has a few outlets on top of the bowl and I don't know where they get connected to. If anyone has experience with these and can help me out, I would appreciate it.

These are not mine but look exactly the same.

DeathBus · Post by **DeathBus** » Tue Aug 10, 2004 7:21 am

Well one has to be fuel, the other 2 I am not so sure of. I dont use stock dual bus carbs, so I am by no means an expert on them. You might try the Type 4 room or Aircooled technology, or I bet Ray knows!

I bet one is for emmissions or both even.

here are some helpful links

http://www.type2.com/library/fuel/34pdsit.htm

http://www.type2.com/library/fuel/dualsol.htm

http://www.aircooled.net/gnrlsite/resou ... rbs101.htm

http://www.lowbugget.com/Kadron_carb_page.html

Contact AJ Simms about them also, he knows just about everything there is to know about Duel Solex carbs, tell him the ones you have and I bet he can help out.

ecdez · Post by **ecdez** » Tue Aug 10, 2004 8:47 am

I will do that. Thanks.

ecdez · Post by **ecdez** » Tue Aug 10, 2004 8:56 am

If you look directly to the right of the middle arrow, you can see the fuel inlet, so the other three have to be something else. Now it's just a matter of what.

DeathBus · Post by **DeathBus** » Tue Aug 10, 2004 9:06 am

it has to be some sort of crazy emission control. But after looking at it, it looks as if those come from the bowl????????

tuna · Post by **tuna** » Tue Aug 10, 2004 10:13 am

I believe the large pipe that's vertical is part of the "central idling system". Don't ask me the details of how it works, but I do know that the Bus carbs had some strange systems installed.

Tuna

ecdez · Post by **ecdez** » Tue Aug 10, 2004 10:28 am

I was thinking they had something to do with emmissions also. I'm thinking about capping them off and goin' for it.

raygreenwood · Post by **raygreenwood** » Tue Aug 10, 2004 2:58 pm

Those nipple are for the hoses!

Ray

raygreenwood · Post by **raygreenwood** » Tue Aug 10, 2004 3:01 pm

You didn't think I would really leave an answer like that did you?

Yes...those are central idleing. You cannot cap them, or the right hand carb will not idle and balance. I will consult the book...and drop in a note later.. My last use of a carburetor...was for a door stop.....

A bag of them also makes a good boat anchor....hee hee. Actually they work quite well...a little finicky....but not as good as injection any day. Much Much better than a progressive or dual kads though

DeathBus · Post by **DeathBus** » Tue Aug 10, 2004 3:28 pm

raygreenwood wrote:You didn't think I would really leave an answer like that did you?

Yes...those are central idleing. You cannot cap them, or the right hand carb will not idle and balance. I will consult the book...and drop in a note later.. My last use of a carburetor...was for a door stop..... A bag of them also makes a good boat anchor....hee hee. Actually they work quite well...a little finicky....but not as good as injection any day. Much Much better than a progressive or dual kads though

Hey now, I'll put my dual kads up against anything anyday, the throttle response is WAY better than a progressive and 2 times as good as fuel injection. Kads are just way finicky about what you use them on and how you use them. They dont have the prestiege of Webbers but I have properly tuned Kads and they run just as well as dual 40 webbers anyday!Goto

http://www.lowbugget.com/

and see what Kads can do!

DISCLAIMER:
I DO NOT CONDONE THE TEARING OUT OF PERFECTLY GOOD FI TO PUT A CARB SET UP ON!!!!!!!!

Also please note, I have an Iron foot and have been known to do burn outs at lights in my Bus, maybe thats why I go through so many clutches and engines!

ubercrap · Post by **ubercrap** » Mon Aug 16, 2004 6:46 am

Here's a thread I thought might possibly relate, don't know if you saw it...

http://www.shoptalkforums.com/viewtopic.php?t=76166

ecdez · Post by **ecdez** » Mon Aug 16, 2004 7:08 am

I did see that thread and a few more. It caused me to do a little research in that direction. It appears as if the carb on one side houses the air/fuel controls for both carbs. OR.. something like that anyway. Everything I read was negative about these carbs. Hard to dial in. Hard to keep tuned. Generally just finiky little bastards.

I dug through some more boxes and found two sets of Type 3 dual carbs. One set was already on Type 4 intakes. I figured I would rebuild a set of these and use them for the time being. When I'm in a situation that I can get something better, I'll put the carbs on the shelf untill the Squareback is ready.

Isn't it great to look through boxes of stuff and find things you don't remember having or buying.

DeathBus · Post by **DeathBus** » Mon Aug 16, 2004 7:11 am

Spend some $$ Buy some Dual 40 Kads off the Samba, (usually $100)have em rebuilt by AJ Simms (around $200), you WILL be happy.

ecdez · Post by **ecdez** » Mon Aug 16, 2004 7:50 am

Here's the deal. Eventually I would like to get something better, but I've spent so much money to get this far that there's not much left to spare right now, and I would like to drive the thing before winter. I could just use the progressive

that's on there now, but I don't really want to. I can however afford some $12 rebuild kits for these duals I have.

I guess the question now would be, are the duals going to be that much better than the pregressive that I should spend about $25 on rebuild kits, a few hours rebuilding, and a few hours dailing them in? Whatever carb I use, it will probably be on there well into the winter.

Any opinions?

BTW: I got the engine in this weekend right before the hurrican moved in.

Still need to hook everything up, but at least it up in there.

DeathBus · Post by **DeathBus** » Mon Aug 16, 2004 8:09 am

ecdez wrote: I guess the question now would be, are the duals going to be that much better than the pregressive that I should spend about $25 on rebuild kits, a few hours rebuilding, and a few hours dailing them in? Whatever carb I use, it will probably be on there well into the winter.

Any opinions?

BTW: I got the engine in this weekend right before the hurrican moved in. Still need to hook everything up, but at least it up in there.

Duals are always better than a single progressive ANYDAY, take that hunk of poop and use it as a boat anchor, door stop or whatever DONT PUT IT ON YOUR CAR. There is a reason why they are cheap, they are cheap!

Personally I would try to piece back together the injection. Especially if some of the guys on the board would help you out, it should be easy enough to find the parts. Is your FI computer still in the car?

For overall performance the FI cant be beat, good fuel economy also.

Dual 40 Webbers run great on Type 4's but can be pricey.
I run Dual 40 Kads on my Brown van and it runs AWESOME at 85 and 90 ALL DAY. They are more finiky than Webbers and are not as easy to set up.

I have ridden in a 411 with a 2 litre 914 engine and Dual DELLORTOS, now that is a GREAT SET UP, but Dellorto parts are becoming scarce and to find a good dual set up is almost impossible.