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post #1 of 583 (permalink) Old 09-20-2009, 11:58 PM Thread Starter
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Post Single Carburetor - which one?

I'm running the Weber 32/36 Prog. right now.
What do you use?
What would you use?
Why?

My next project will be the Solex 30PICT-1 like the one below.
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post #2 of 583 (permalink) Old 09-21-2009, 08:21 AM
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I would use whichever carb you have the most experience with and has the best reliability. Considerations are; are you interested in performance, reliability, fuel economy, or a combination of the three? I used the VW carb setup and I noticed no difference in performance and fuel milage and got better reliability. Having worked on SU, Weber, and Zenith carbs; I know there are many that can do a good job. I picked the one that I believe is the easiest to work on with the least amount of maintanance needed to keep it running properly. I'm sure there are alternatives that will suit each individuals requirements.

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post #3 of 583 (permalink) Old 09-21-2009, 08:29 AM Thread Starter
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Serviceability... This one will be for its "anywhere by anyone" serviceability.
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post #4 of 583 (permalink) Old 09-21-2009, 07:36 PM
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So I've heard of guys who are running Holley progressive carbs. [Like the 32/36 mentioned above, BTW I don't know what the numbers indicate ??? are they jet sizes or something? and what CFM are those?]

Speaking of CFM, someone mentioned 650 CFM, but some of these carbs seem to be a lot smaller than 650, more like 165 or 175. I know it makes a difference. Is that the gas fuel/volume? or the size of the plenum?

Also is there a minimum size for a plenum? What size is recommended?

VW carbs, Solex,others, and I'm afraid I have to show my ignorance here and say truthfully that what I want is good reliability, low maintenance, and decent gas mileage. so yeah I want something of a trifecta. And if it has a little pep then that would just make me grin even bigger. I don't need to hit 100mph, but 90 would be nice.

So since I am a new guy to this technology, which carb would give me the best performance?

BTW, this is my winter project and I plan on building my intake manifold from PVC. [Completely PVC and glue, and some paint.]
Since this is a project, I'll try to document it with lots of pics as well. I already have gotten some diagrams/schematics put together and I'm looking forward to the tinkering. I think it would look so crazy to having the whole intake manifold from PVC and spray painted to look like metal. We'll see how it goes. My prices lists currently is less than $25 for parts. (not including the carb itself.)

I love to tinker.

IF it ain't broke, ... Work on it, ... It soon will be!!!

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1980 GL1100 Goldwing Interstate
Possibly the oldest Goldwing Interstate still on the road. VIN translation is #5.
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post #5 of 583 (permalink) Old 09-21-2009, 08:26 PM
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I had a 70's Dodge tradesman van with a 318 CID engine and single BBL carb which was super easy to work on, very reliable and has an electric choke.
I dont know which brand carb it was and probably too big for a GW application but Dodge put a 6 cylinder in the same van so I might try that route.
Either that one or a Holley, both I'm familiar with but the Holley's I used to have trouble with the floats and seats.
Pretty much any small carb that has jetting available so I can tweak it is what I'm after.

1983 GL1100 Interstate with 1200 engine, single carb, and C5 ignition.



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post #6 of 583 (permalink) Old 09-21-2009, 09:59 PM
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dan filipi wrote:
Quote:
I had a 70's Dodge tradesman van with a 318 CID engine and single BBL carb which was super easy to work on, very reliable and has an electric choke.
I dont know which brand carb it was and probably too big for a GW application but Dodge put a 6 cylinder in the same van so I might try that route.
Either that one or a Holley, both I'm familiar with but the Holley's I used to have trouble with the floats and seats.
Pretty much any small carb that has jetting available so I can tweak it is what I'm after.
Dang, I bought the same van 6 years ago out of a junkyard with a single barrel carb on a small V-8. Cleaned up all the gunk and dirt off the block, replaced all the plugs and wires and it ran like a champ!! I gave all of 400 for it and sold it a few months later for 800. It even still had the after market a/c setup in it and all it needed was freon.

I sold it to a guy so his yard crew would have something decent to haul the trailer with all the mowers on it. Sometimes I wish I still had it as it wasn't bad on gas at all.




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post #7 of 583 (permalink) Old 09-22-2009, 04:11 AM Thread Starter
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grayglennsr wrote:
Quote:
Speaking of CFM, someone mentioned 650 CFM, but some of these carbs seem to be a lot smaller than 650, more like 165 or 175. I know it makes a difference. Is that the gas fuel/volume? or the size of the plenum?
CFM flow for the GL-1000:
RPM @ 100%VE@ 75%VE (VE = Volumetric Efficiency)
1000 rpm = 18 cfm = 13 cfm (I say 75% for myVE, not yours..)
2500 rpm = 44 cfm = 33 cfm(cfm is a measure of demand)
4000 rpm = 71 cfm =53 cfm
6500 rpm = 115 cfm = 86 cfm
8000 rpm = 141 cfm = 105 cfm

A Weber 32/36 DGV flows 255 cfm...
The primary (32) flows about 190 cfm...
The secondary (36) flows the balance when activated.
The throttle progression is: primary = 1st 2/3: secondary = the last 1/3 (...roughly).
There is a fairly quick transition from primary to secondary.

So... knowing what the motor will flow, and its operating rpm range, tells us how much carburetor we need, and how much we don't need. (...of course it's simplified)

If the above is taken as gospel, then we see that the 32/36 DGV may be more carb than we need. Looking at Webers chart below says we're 'bout right on the money though.There are any number of variables (erroneous inefficiency is one) that allow for error in trying to calculate with accuracy. My Weber sits on a 8-rubbered Type-3 manifold, and I aint calling that efficient by any standard, but it works.
I'd be happier with a smaller carburetor on my bike, but what I've got works for now.

Here is my Weber chart with input: (others may differ)
Line #1 = redline @ 9500 rpm
Line #2 = factory spec max pwr @ 7500 rpm
Line #3 = where I'll normally highside my upshift when tooling around.
Line #4 = one cylinders capacity...

Weber has other charts, but this one is a good start for us.




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post #8 of 583 (permalink) Old 09-22-2009, 06:52 PM Thread Starter
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Here's a useful blank graph for the DIY'er...


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post #9 of 583 (permalink) Old 09-22-2009, 06:56 PM Thread Starter
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Carburetor project #2: Weber 28/36 DCD

Like this one:


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post #10 of 583 (permalink) Old 09-22-2009, 06:59 PM
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As long as the cfm is adequate is a 2 bbl necessary?

1983 GL1100 Interstate with 1200 engine, single carb, and C5 ignition.



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