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Full Moon Bus Club :: Forums :: Tech Talk :: Tech Questions
 
<< Previous thread | Next thread >>
dual vs. single carb....thoughts?
Moderators: TN Jed, docric, sweetbus, Tom and Phaedra, Collie
Author Post
lhgann
Sat Feb 11 2017, 09:13AM
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Joined: Mon Feb 03 2014, 11:15AM
Location: North Alabama
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My 77 bus has the engine apart right now, fixing to build it back up. Obviously, orginaly a fuel injected. Was converted in Europe to a non standard (to me, hard to get parts for) dual carb Weber. The carbs look pretty well buggered, so we are looking at replacing the whole set up.

My question: I am considering a single carb set up vs. the dual, my thoughts being that me not being a carb guru will have better luck maintaing a single carb vs. dual set up.

Thought's on power, reliability etc. Things I havnt considered that I should?

Thanks

RG

Richard Gann
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sunroof71
Sat Feb 11 2017, 03:36PM

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Fix the fuel injection properly or go single carb. B.

1971 Sunroof bus- Fred
1969 westy- Lamont
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Fred
Sat Feb 11 2017, 06:05PM

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single carbs are simple and work fairly well if all else is well. BUT you will not see great fuel economy . The intake tubes get cold and the fuel condenses some. This contributes to lag when accelerating. There are some clever ways to keep the intakes warm.


Had too many vans to count
The best Bus tech site : www.ratwell.com
https://www.facebook.com/gearhead.vonfredericksen


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oatmeal
Sun Feb 12 2017, 08:24AM

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add in the fact that air cooled f.i. systems are harder to control than water cooled f.i. systems because the head temperatures in air cooled engines run hotter and excessive hydro-carbon emissions were the enemy at the time. fred is right though, my '73 had a weber progressive that would carburetor ice until I figured out how to use warm air from the cooling system to keep the carburetor at a sedate 80 degrees not matter how cold it was.

past busses:
'73, '85, '93, '93, & '02

"all it takes is a few cuts on the Humor to make the rest seem like the ravings of a dangerous lunatic."
- H.S.T. - June '71
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markdearing
Sun Feb 12 2017, 01:30PM
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that single progressive weber is the poor boys fix, it never works great but just well enough, dual weber 34 ict work great later md

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jt
Wed Feb 15 2017, 09:18PM

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Mark weighed in, had to look. Yeah, agreed. If you know what you are doing you can get a single progressive to work, but usually if you are using a single progressive, you don't know what you are doing. Maybe some of you don't think that's funny, but I know Mark does.


jt
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oatmeal
Wed Feb 15 2017, 09:33PM

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I get it, I inherited that from p.o., I put 29,000 on it before I gave the motor to a friend for his bus. as I said, once I figured out the carburetor heat stove, ended the carburetor icing and installed pcv valve in the manifold plenum, it was fine. the rusted out rear frame was another story, but since then I have learned to weld.

past busses:
'73, '85, '93, '93, & '02

"all it takes is a few cuts on the Humor to make the rest seem like the ravings of a dangerous lunatic."
- H.S.T. - June '71
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84-westy
Wed Mar 08 2017, 10:28AM
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Would a Redline Weber kit be the best way to get a duel carb setup? I currently have a single carb on a 2.0L in my '72 bus (motor out of a later bus).

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Fred
Wed Mar 08 2017, 05:11PM

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84-westy wrote ...

Would a Redline Weber kit be the best way to get a duel carb setup? I currently have a single carb on a 2.0L in my '72 bus (motor out of a later bus).



Not without problems. Read up on the Ratwell website


Had too many vans to count
The best Bus tech site : www.ratwell.com
https://www.facebook.com/gearhead.vonfredericksen


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mdwdrw
Fri Apr 21 2017, 10:05AM

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Joined: Tue Mar 01 2011, 10:56AM
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Dual carbs can work well, but you need a quality linkage. You have the dual carbs already. What makes them appear "buggered"? Often they can be disassembled, soaked in carb cleaner and reassembled with new overhaul kits. When VW was using dual carbs on the busses, they had an elaborate way of helping to keep them balanced over the long haul. Most aftermarket dual carbs will require some tweaking from time to time to keep them balanced. That is where quality linkage comes into play. I would see what you can do with your dual carbs before throwing in the towel and avoid the "holley/weber" progressive setup if possible. Good luck.

Mark and Donna 82 Vanagon Diesel Camper
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Fred
Fri Apr 28 2017, 01:44AM

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I just got back from a 900 mile trip. My 73 bus has a 1700 fed by a single weber progressive and I averaged 19 mpg. The route was was US 17, avoiding high speed traffic.





Had too many vans to count
The best Bus tech site : www.ratwell.com
https://www.facebook.com/gearhead.vonfredericksen


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oatmeal
Fri Apr 28 2017, 07:53PM

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my weber got 18 mpg and was last seen on its way to a new home in a '75 (back in '92).

past busses:
'73, '85, '93, '93, & '02

"all it takes is a few cuts on the Humor to make the rest seem like the ravings of a dangerous lunatic."
- H.S.T. - June '71
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