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Started this design a year ago and will start machining the first prototype this afternoon. It's completely unnecessary but so is much of what we do with scooters.

Goals:
  1. Provide good mounting for a bellmouth that didn't have the mounting screws disrupting the bell.
  2. Maximize the airflow space above the bell
  3. Incorporate a standard float needle valve and seat to allow replacement as well shimming for level adjustment.
  4. Minimize fuel flow losses and air bubble traps
Inspiration was taken from the SI23/27 used on the GS/SS where the float cover passes over the entire top of the carb.

This will be fitted to an SI24G with the top surface milled down to match the top of the float bowl. the transition of the bell to the carb bore will be done as a matched set.
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This design seems such an improvement, nice job! So a proto hogged out of billet? Would make a nice casting if done right, then just machined in the fussy places. IF there developed enough demand.
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Yup hogged from billet, starting stock is 3.5"x3"x2"

I'll get lots of photos of the process.
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First part went almost perfectly

Side one:
hogging out the bulk of the material from the bottom side, leaving the supports for the float.
hogging out the bulk of the material from the bottom side, leaving the supports for the float.
contouring the under side of the bell.
contouring the under side of the bell.
First side done, now to flip it and do the top.
First side done, now to flip it and do the top.
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Second Operation:

Had a very small misalignment, Purely cosmetic but need to fine tune the soft jaws.
Roughing out the top side
Roughing out the top side
finish pass on the bell
finish pass on the bell
I'm ready for my close up...
I'm ready for my close up...
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Soooooo good this…

Appreciate the level of detail and thought that's gone into it.

I will buy (it's it's for sale…) and just to find a PX to fit this on…
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UTC quote
Beautiful! Count me in also, if you make a batch.
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Nedminder
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Gracious Patric - that's amazing.
Did you machine that in your unfeasibly large basement?!
Design is very cool.
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Absolute work of art Patrick!
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Molto Verboso
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UTC quote
Good stuff!
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UTC quote
Just... wow.

Amazing work Patrick! Love it.



I wonder if you've been keeping up with the next iteration of the Vortex carb? A french guy (Guy-François Evrard) is doing it with Al (Harpham) giving pointers.
https://www.facebook.com/GF.Evrard. You may be interested to have a look. He's also the guy behind the 150-to-200 cylinder conversion now available as a kit at Scooter-Center. Although he may have come up with it after talking to me...
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Ginch wrote:
Just... wow.

Amazing work Patrick! Love it.



I wonder if you've been keeping up with the next iteration of the Vortex carb? A french guy (Guy-François Evrard) is doing it with Al (Harpham) giving pointers.
https://www.facebook.com/GF.Evrard. You may be interested to have a look. He's also the guy behind the 150-to-200 cylinder conversion now available as a kit at Scooter-Center. Although he may have come up with it after talking to me...
To be fair, Patrick's machined top is the extension of HRS idea. . . And I like it.

I've taken a closer look, and well, appears you are using an allen screw to hold down the cover? This was a problem on the HRS carbs as users who did not use locktite found that that the screw would work itself out of the carb and into the venturi.

The last few versions of the HRS came with an adjustable air corrector. Four holes were drilled into the air corrector perpendicular to the length. the top of the air screw was tapped and an allen screw used to adjust the amount of air. Thus-you can adjust the air mixture screw from 0 to 180 and beyond.

Kudos Patrick. If you ever have any available for sale, i would love to pick up a couple.

Thanks for your contribution and LOVE the this is USA made.
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GickSpeed wrote:
To be fair, Patrick's machined top is the extension of HRS idea
Absolutely! When I made my first bell mouth I intentionally didn't make it for the SI24 because the Vortex had that covered at the time.

I'm not sure this approach will end up cost effective. Considering the 3D printed bell is only $15.30

If it does it would include a modified carb with matched top, filter, and carb box lid (needed to clear the front edge of the bell and all the high volume ones are ugly). It's more an exercise in "what could the SI carb have been". but even then it's still an SI carb.

I fully expect Polini et al. to copy it and part of me would consider that a "mission accomplished", the other part would be annoyed that they didn't use the ideal bell profile...
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Veni, Vidi, Posti
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UTC quote
GickSpeed wrote:
To be fair, Patrick's machined top is the extension of HRS idea. . .
True. But I find Patrick's to contain 37.63% more niceness.
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Just way too freakin cool! Sign me up if ya do a batch!
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Decked the top of the carb today. zinc machines about like brie.
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oopsclunkthud wrote:
Decked the top of the carb today. zinc machines about like brie.
Bolt it to a flat plate than deck top?
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Christopher_55934 wrote:
Bolt it to a flat plate than deck top?
yup. stock the 24G has the filter surface ~2mm higher than the float bowl surface. Brought it all even and will have a gasket across the whole face as well.

have hours of deburring ahead of me.
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UTC quote
Such a cool passion project! Add me to the list of buyers!
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Wow.

Slick piece of kit!
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Deburr is done, did not take hours but it's amazing how gummy the metal is. file made fast-ish work of it.

Next up is a laser cut gasket.
Nice and snug
Nice and snug
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Beautiful, a piece of ART! Clap emoticon

Looking forward to seeing it in action.
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UTC quote
oopsclunkthud wrote:
Deburr is done, did not take hours but it's amazing how gummy the metal is. file made fast-ish work of it.

Next up is a laser cut gasket.
Machine deburring?
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Nedminder
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UTC quote
Pretty damn cool Patric
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UTC quote
This project is amazing in every way.

I can't even begin to touch this level of fabrication skills, which makes it all the more amazing to me.

I would pick up one of these even though I generally go side draft for any real performance builds, just to have it as a work of art in one of my motors.
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Veni, Vidi, Posti
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Beautiful!!
⬆️    About 2 months elapsed    ⬇️
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Little more progress, got laser cut gaskets.
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Hooked
VBA1T/Px200 iris/VNB6t
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Piece of art !!!
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