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Full Moon Bus Club :: Forums :: Tech Talk :: Tech Questions
 
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dual vs. single carb....thoughts?
Moderators: TN Jed, Lickity Split, docric, sweetbus, Tom and Phaedra, Collie
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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
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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.


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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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