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Dual carb to single carb intake Easy D.I.Y.
Old 11-20-2010, 05:39 PM   #1
Wizersoft
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Dual carb to single carb intake Easy D.I.Y.

Thanks to McVeigh and a few other brothers on here, i believe i have found the easiest
and probably the cheapest "good" way to make a intake manifold for converting from stock
dual carbs to a single carb.
After doing some measuring, i found some interesting facts. Those findings resulted in
the following intake.
Using 1" hot water pvc & two fittings. A 90 degree fitting an a Tee fitting along with
a 1-1/4" piece of straight pvc.

Attachment 14165

The first pic, you see i have the Tee fitting. I have measured in 1/2" on one end and made
a black mark. This is where i am using a dremel tool to cut the Tee shorter due to it being
too long for our purposes.

Attachment 14166

Also, i have made a red line on the Tee for you. The red line is where i am using the Dremel
tool with a small drill bit to create an indention all the way around this end.
If you look at the stock carb and how it slips into the mounting rubber at the head, i am
basically reproducing a similar type groove.

Attachment 14167

I will have to make the same groove on one end of the 90.

Here is what it looks like complete.

Attachment 14168

NOTE: It is difficult to mount this in the rubbers. I had to use a mallette. However using a
lil WD-40 on the ends to make them slippery helped. It will have to be removed to glue all the
pieces in their final placement. To insure fitment, i drew a line from the 90 to the tee just
in case i lost alignment when removing.
This is it installed.

Attachment 14169

Attachment 14170

Now i purchase a 40mm flange for mounting the carb to the PVC.

Attachment 14172

Attachment 14171

Next attach the carb to the flange. Make sure to buy a carb that bolts to the flange!

I will need to make a mount that will hold the carb in place with a secure fit.

Hook up throttle cables, choke cable & breather.

Wha-La!

Complete setup and no welding required.

And yes, hot water pvc is made to withstand high temperatures.
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Last edited by Wizersoft : 05-14-2012 at 08:03 PM.
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Old 11-20-2010, 06:53 PM   #2
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you'll need to mount a steel strap to the right rear of the carb to mount to the rear of the front jug to hold the weight of the carb....you'll also need to atomize the fuel as it leaves the carb and hits the intake, to even out the flow or the rear will run way rich...a stainless strainer screen will work for that.
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Old 11-20-2010, 07:41 PM   #3
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McV is absolutely speaking from experience.

I forgot to metion the atomizer screen. However the 1-1/4" pvc that holds the 90 to the Tee has a smaller inside diameter than the Tee. Thus helping keep the fuel balance.

Thank you McV on the info for strap!

Caution: The screen Must be metal. Brass, Stainless etc... Do not use a cheap window type screen material. It will fail "all too soon" and go into the engine.

Hope this helps.
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Old 11-21-2010, 03:06 PM   #4
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Is it really that easy? I'm not saying I doubt you, but it is almost to good to be true. I have researched this in the past and hear all of the horror stories about the rear cylinder starving for fuel and the adjustment nightmares. After working on my carbs this past weekend I would love to have a 1 carb set up.
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Old 11-21-2010, 03:14 PM   #5
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A pic is worth a thousand words! What does that tell ya?

p.s. i did notice today in good light that the manifold sets just a bit askew. Other than that, it is tits!
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Old 11-21-2010, 05:52 PM   #6
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What carb did you use? Jetting? Where dose the screen go? I'm sure that I am not the only one interested in this. Great write up. Thanks for the info.
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Old 11-21-2010, 06:14 PM   #7
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The screen goes in between the carb and the carb mount. It has to be placed in such a way as to be secure, yet does not cause an air leak.

I will be using a 38 mm mikuni carb like those commonly found on alot of harleys.

I will go with stock jetting and see how that works.

Thx. I could do better when i learn how to use the perks on the site better.
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Old 11-21-2010, 07:10 PM   #8
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I used a 40MM '05 Sportster Carb with a 48 slow, 175 main, stock Sportster needle with 2 shims. I also used a steel intake manifold., that PVC one would be an excellent prototype to use as a takeoff if you decide to go steel, which would mean that you wouldn't need to add a mounting strap to your carb because the steel flange would carry the carb/breather backplate weight.
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Old 11-21-2010, 10:47 PM   #9
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Dont forget the round air cleaner too. That makes a difference too.
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Old 11-26-2010, 09:20 AM   #10
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I love this. Definitely interested in doing something like this. Would make working on the bike so much easier. Take that PVC to a machine shop and have them do you something in metal. Then start selling these as a kit. I know I would buy one if the price was right. Cant wait to see the finished product.

So the screen just attaches between the carb and the flange? How does this supply equal amounts of fuel to each cyl?
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