32 picbt Solex carbie.
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Thread: 32 picbt Solex carbie.

  1. #1
    VIP Sponsor 59 Floride's Avatar
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    Default 32 picbt Solex carby.

    I've recently cleaned and re-kitted an old Solex carby to use as a spare.

    There is a small hole drilled into the idle circuit (?) which I presume is for fine tuning.

    Can anyone expand on the purpose of this hole..?






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    Attached Thumbnails Attached Thumbnails 32 picbt Solex carbie.-img_3500.jpg   32 picbt Solex carbie.-img_3501.jpg  
    Last edited by 59 Floride; 16th May 2016 at 08:31 AM.

  2. #2
    Too many posts! JohnW's Avatar
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    Well, well. I've never seen a hole there before. Or never noticed one anyway. It certainly looks original doesn't it? The idle jet is the top one, the smallest, is it not? The big one at the bottom is the main jet. So, are you sure it is drilled into the idle circuit?

    I thought the middle jet was to do with regulating the fuel flow from the accelerator pump.

    By chance, today I found a Solex service manual from the mid-1950s, including a 32 PCICc suitable for a Peugeot 403. Naturally the only photograph there is the wrong side, but the diagram looks like yours with a manual bi-start not an automatic one. There is no sign of a hole where yours is shown but I can discern on the diagram a wee circle in that place. There are NO holes shown in that position on the schematic diagram of the carburettor.

    I've scanned those pages - one is fold-out, so the part numbers only correspond to the German column, but you can go sideways to find the English words even if the numbers change.

    I wonder if it is a casting hole that should have a plug in it. It makes no sense to me to have a hole there. I'm sure it is nothing to do with idling.

    Cheers
    Attached Thumbnails Attached Thumbnails 32 picbt Solex carbie.-32-pbicc-exploded-diagram.jpg   32 picbt Solex carbie.-32-pbicc-description-diagram.jpg   32 picbt Solex carbie.-32-pbicc-parts-list-page-1.jpg   32 picbt Solex carbie.-32-pbicc-parts-list-page-2.jpg  
    JohnW

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    Hmm, the plot thickens. Yes JW the top jet is idle. I have 4 identical carbs, and a few variants, and checking the depth of the hole with a pin, it seems that the hole is only drilled to a depth just short of breaking through into the idle gallery, seems the hole is ready for something, but what..?

  4. #4
    Too many posts! JohnW's Avatar
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    When you get together, as I have, a pile of those diagrams in one folder, Solex seems to me to have done an amazing job of making carbies for all purposes based on a near standard casting, or at least a near standard layout. All of the castings have several light plugs of maybe 2 mm diameter here and there.

    I'm glad it doesn't go anywhere - in that position I think fuel would pour out each time you accelerated and possibly all the time.
    JohnW

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    1000+ Posts geckoeng's Avatar
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    On the later motors there was a vacume advance on the dissy, and I can remember a brass tube in this vacinity on the carb for vacume to the dissy. ......??????
    Ray geckoeng

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    G'day Ray, there is a vacuum tube at the base so that isn't it either..

    The idle circuit works the same as any other and if this hole were drilled through it would negate the accuracy of the idle jet..

    Attached Thumbnails Attached Thumbnails 32 picbt Solex carbie.-img_3510.jpg  

  7. #7
    VIP Sponsor 59 Floride's Avatar
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    Something else of interest (to me anyway), the floats in these carbies are reportedly not adjustable as such, but adjustments can be made by using a thinner washer under the needle jet holder.

    Because my Fregate has such a brute of an engine (2.145lt) she kept starving for fuel under peek load so I remedied it simply by adding an extra top gasket, did the trick.

    But I just discovered that some floats have a different number stamp, meaning that adjustment is indeed also made via interchangable floats.

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    Too many posts! JohnW's Avatar
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    Yes, you can raise or lower the float level by shimming the valve. As well, you could/can buy floats of different weights to change the float level. Same overall volume, but more mass. The numbers are grammes I think - my odd floats have the number then a script "g".

    Is your carbie a French one?
    JohnW

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    Quote Originally Posted by JohnW View Post
    Yes, you can raise or lower the float level by shimming the valve. As well, you could/can buy floats of different weights to change the float level. Same overall volume, but more mass. The numbers are grammes I think - my odd floats have the number then a script "g".

    Is your carbie a French one?
    Well I don't rightly know if it's French or not as I'm not yet a Solex whisperer, but given another 20 years...

    So if there are different float weights, that means that a '502' would float higher than a '507' and let more fuel in yes..?

  10. #10
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    Wait on, a heavier float would raise the level higher, is that it, I'm confused?

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    1000+ Posts daffyduck's Avatar
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    My guess is that spot was used for an electric idle jet on other applications.

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    Too many posts! JohnW's Avatar
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    Quote Originally Posted by 59 Floride View Post
    Wait on, a heavier float would raise the level higher, is that it, I'm confused?
    Of course. The confusion is at this end!
    JohnW

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    1000+ Posts Wildebeest's Avatar
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    Quote Originally Posted by JohnW View Post
    Of course. The confusion is at this end!

    John,
    Do you think our old mate Archimedes could sort this out?

    59 Floride, "Solex Whisperer" I like that.

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    Too many posts! JohnW's Avatar
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    Quote Originally Posted by Wildebeest View Post
    John,
    Do you think our old mate Archimedes could sort this out?

    59 Floride, "Solex Whisperer" I like that.
    Excellent, reconnected!! I was thinking of ringing you. "Solex Whisperer" is great! And yes, Archimedes, but it is a very small bath-tub.
    JohnW

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  15. #15
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    Here's an interesting resource showing exploded views of every Solex made since Noah discovered petrol engines, including my Fregate..

    Click on the -MAIN- link at the bottom of the home page, lots more stuff there.

    http://www.oldengine.org/members/die.../SolexCarb.htm


  16. #16
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    So I installed this carby, which was to be my spare, and took it for a fang out the road. The motor seems to run smoother and idle is a little better too, I think I'll keep it on..

    https://youtu.be/7shF-vwl4A4
    Last edited by 59 Floride; 16th May 2016 at 08:33 AM.
    GreenBlood and FIVEDOOR like this.

  17. #17
    VIP Sponsor 59 Floride's Avatar
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    More info for this particular carburettor taken from my bible including images of how the auto choke goes together, important if one expects it to function properly. Don't ask me how I know..

    Attached Thumbnails Attached Thumbnails 32 picbt Solex carbie.-image-43-.jpg   32 picbt Solex carbie.-image-44-.jpg   32 picbt Solex carbie.-image-45-.jpg  

  18. #18
    VIP Sponsor 59 Floride's Avatar
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    Gees, it seems that everything is capable of wearing..

    My carby linkage has been falling off and I thought I may have to resort to a new school, off the shelf job until I discovered my ball has worn by 0.3mm which was just enough to cause problems.

    I also noticed the socket has a C shaped wire clip that has probably worn too.

    After swapping the ball with a healthier one all is good.

    My message for the day, grease your ball joints. Even at the carby.

    Attached Thumbnails Attached Thumbnails 32 picbt Solex carbie.-img_3838.jpg   32 picbt Solex carbie.-img_3842.jpg   32 picbt Solex carbie.-img_3843.jpg   32 picbt Solex carbie.-img_3844.jpg   32 picbt Solex carbie.-img_3845.jpg  

  19. #19
    Fellow Frogger!
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    Hi,

    My 32 PIBCT carburetor fitted to the Dauphine Gordini motor in my 750 also has the drilling that you show in your photos.

    Regards

    David

  20. #20
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    Factory specs for the 88 X 88 2.145lt engine..

    Attached Thumbnails Attached Thumbnails 32 picbt Solex carbie.-x.jpg  

  21. #21
    1000+ Posts REN TIN TIN's Avatar
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    A 32mm carby sounds awfully small for a 2 litre motor.
    The general formula (from Solex) is 0.82 times the square root of (single cylinder capacity times RPM/1000).
    So the square root of 500cc per cylinder times say, 4500PRM = 47.43.
    This time .82 equals 38.9.
    Even at 4000RPM this is still around 37mm.
    A32mm carby is more suited to 1000cc - 1300cc.
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  22. #22
    VIP Sponsor 59 Floride's Avatar
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    I'm hearing you Ren.

    One item on my long 'to do list' is to modify/blend/graft an R12 and Fregate manifold to take a DIR32, just for the hell of it so at least I will have a more efficient carby.

    I'll need to find someone locally who can weld cast alloy though.

    Edit: of course I could always modify the manifold to take 2 x 32 PICBTs
    Last edited by 59 Floride; 11th July 2016 at 08:29 AM.

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  24. #24
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    So it seems that these old carburettors had factory matched parts in the auto choke and mixing parts can lead to poor starting performance.

    For the auto choke to work at it's optimum it is vital that the choke disc and carb body are a really close match and seal properly. I had swapped some parts from other carbs which lead to immediate poor starting because they weren't a matched pair. Perhaps some lapping paste and a bit off physical effort would be enough to match these parts.

    Attached Thumbnails Attached Thumbnails 32 picbt Solex carbie.-til.jpg  

  25. #25
    VIP Sponsor 59 Floride's Avatar
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    I also found a manifold on the WWW which was made for a two carb assembly. I have many spare inlet manifolds that I could cannibalise to make one of these pearlers. Hope the back tyres can handle the extra horses..

    Attached Thumbnails Attached Thumbnails 32 picbt Solex carbie.-1c4c489145fdc527744f29f838a1c65ad27c68ed.jpg   32 picbt Solex carbie.-6575c737de710c73354386f4b0ed49cc4f140135.jpg   32 picbt Solex carbie.-c3556ffb465e40b508b4576f5a8e03b57b11429b.jpg  

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