Eagler's Nest
Engines => 3 cylinder Radial => Topic started by: Brock on May 29, 2026, 07:58:59 PM
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I've searched the forum several times about the Mikuni carbs and have found very little (two posts?) on the subject. As I recall two builders are using different size carbs on the Verner. Are there any other carbs being used on the Verner. My goal would be to eliminate the weight of the fuel pump and go gravity feed only. What are folks using and finding reliable?
Thanks
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We have an early model 3VW engine. It came with a Walbro carb, which required a fuel pump (also provided with the engine). We decided to remove the Walbro and put on a Mikuni VM26 carb. (possibly VM26-606, not positive)
The Walbro was mounted in an almost vertical orientation. To mount the Mikuni, we had to modify the intake plenum on the Verner to allow the Mikuni to be near horizontal as related to the engine. The Mikuni is gravity fed from the wing tank with an inline fuel filter.
Works great.
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I asked Verner about using the S&S carb w/gravity-feed and eliminating the fuel pump. They indicated that it's just a matter of a larger inlet orifice. Makes sense, since once the float closes off this oriface the fuel pump is not doing anything. So, it looks like there is space to drill out the stock oriface and still get the stopper to seat. Only question is, drill it out by how much?
The plan is to connect a tank with the same verticle head as I expect and measure the flow through just the pictured fitting. But I need to know how much fuel flow is required. Can anyone tell me what is the fuel flow at maximum throttle of their Verners? This information does not seem to be in their manual.
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I typed in Mikuni in the upper right. Set the search dropdown to entire forum and got 4 pages of Mikuni messages...
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I typed in Mikuni in the upper right. Set the search dropdown to entire forum and got 4 pages of Mikuni messages...
So are you say'n my S&S/Verner related question would obviously be found in the Mikuni pages? I hadn't thought about it, yes I could see that required Fuel Flow might be talked about. Uh, thanks.
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I've searched the forum several times about the Mikuni carbs and have found very little (two posts?) on the subject.
Not saying that, just saying the search function in the upper right is not useless any more if you set the scope of the search by clicking the caret and picking from the drop down.
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I asked Verner about using the S&S carb w/gravity-feed and eliminating the fuel pump. They indicated that it's just a matter of a larger inlet orifice. Makes sense, since once the float closes off this oriface the fuel pump is not doing anything. So, it looks like there is space to drill out the stock oriface and still get the stopper to seat. Only question is, drill it out by how much?
The plan is to connect a tank with the same verticle head as I expect and measure the flow through just the pictured fitting. But I need to know how much fuel flow is required. Can anyone tell me what is the fuel flow at maximum throttle of their Verners? This information does not seem to be in their manual.
Early on in my experiments with the cheapo clone S&S, I bought one off of Amazon with spare jets. Cheap. Most of them were the same or not drilled at all..(roll eye) Naturally, they are for a hawg which uses a *lot* more fuel than the Verner. I just measured the inlet orifice at .160" which coincidentally is really close to 4mm, so there ya go. :)
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I am using the Mikuni VM26-606 on my Verner 3V. Works good.
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Thank you Les, I'll definately look into the VM26.
But for grins, I'm going to check the gravity flow through volume throught the S&S float/needle/orfice and see if it can not be drilled out to provide 4 gph (I think that would be plenty for max flow) if not I'll order the VM26.
Starting to see the light at the end of the tunnel.