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Thread: Couple of carb questions.

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    Couple of carb questions.

    I’m trying to setup a set of C35 PHH-E3 carbs after rebuild. Can any of the carb specialist advise the initial idle mixture settings the best material or compound to use for securing the idle air bypass screws once set. I’ve searched and can seam to find very much info on these late model carbs. Michael

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    Re: Couple of carb questions.

    Hi

    OK, here we go (again).

    Set the mixture to quite rich before starting. On the E3, the mixture screws have a fine thread, so that is several turns out from fully in. The E3 provides with ports to balance the carbs. With a suction measurement tool, first set the balance between the two blocks, then the internal balance between the two sides of each block, then the balance between the blocks again, and so on, till the four inlet have the same suction. Adjust the slow running RPM screw all the while to the recommended 800-900 RPM (best use an good RPM counter, don't trust the Lancia rev counter for accuracy).
    adjust the mixture screws as follows: turn in slowly making it leaner. The RPM will normally strat to go up. At a certain flat point, it will reach maximum, then very slighty will go down slightly if you continue turning, and then quite abruptly will go down significantly. Turn the mixture richer (out ) again at this point, very slowly, just till the RPM pics up again. That's aproximately the right idle mixture setting. You need to keep adjusting idle and also balance all the time while doing so, all the setting screws influence eachother. I do kind of iteration, first an initial aprox setting, then a next cycle finer adjusting, etc...
    As to close off the screws. Often paint is used. I prefer to put in some gray putty that stays soft, so that I can readjust later by going with the screwdriver through the putty.
    Lancia Fulvia 2C 1964
    Lancia Fulvia Coupe Rallye 1,3 1968
    Porsche 924 1979
    Alfa Romeo 33 1.4IE 1993

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    Re: Couple of carb questions.

    Sorry to hijack thread, I have a problem with my set up where the car is running pretty good but every now and again it will foul the plug on either cylinder 1or 2 at idle. I've done a compression test and all cylinders have a reading betwen 150 and 160. I have moved to an electric fuel pump with an inline filter but never reinstalled the fispa filter and regulator, I'm now wondering if there is a possibility that the pump is running at too high a pressure and due to the fact that there is no return on series 2 carbs that the float chamber if the front carb could overfill?

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    Re: Couple of carb questions.

    Quote Originally Posted by kev1_3s View Post
    Sorry to hijack thread, I have a problem with my set up where the car is running pretty good but every now and again it will foul the plug on either cylinder 1or 2 at idle. I've done a compression test and all cylinders have a reading betwen 150 and 160. I have moved to an electric fuel pump with an inline filter but never reinstalled the fispa filter and regulator, I'm now wondering if there is a possibility that the pump is running at too high a pressure and due to the fact that there is no return on series 2 carbs that the float chamber if the front carb could overfill?
    Hi Kev

    got me confused: S2 carbs do have a fuel return line normally? If there was originally a FISPA regulator, this is a S1 car (there was no FISPA any longer in the S2/3 Fulvias, due to the return line setup)? Do you mean PHH 2 carbs maybe (PHH 2 are S1 carbs) instead of S2 carbs?

    To answer the question. Yes, the solexes are quite sensitive to fuel pressure. If the problems started after installing the electric fuel pump, it is most likely due to too high fuel pressure, the electric pump delivering maybe a higher pressure than the mechanical pump. It is bit surprisingly only the front carb seems to have the problem tho, but not impossible. But there are other possibilities, such as bad idle mixture setting. Even problems with the ignition could be a cause. Etc. It is very hard to remotely diagnose such a thing.
    If possible at all, I would get the regulator back if these are carbs/car without fuel return line. It is really quite important to have the correct pressure (especially if you have switched to a non-original fuel pump - the mechanical fuel pump has a fuel pressure regulator of it own build in, be it with slightly too high pressure, hence the additional FISPA regulator)). If the FISPA is no longer serviceable, KING has a filter/regulator or a regulator without filter you could use.
    Lancia Fulvia 2C 1964
    Lancia Fulvia Coupe Rallye 1,3 1968
    Porsche 924 1979
    Alfa Romeo 33 1.4IE 1993

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    Re: Couple of carb questions.

    The problems didnt start with the introduction of the fuel pump, I never had it running without it.
    I know it shouldn't just be the front carb but im working on the assumption that the fuel flows from the back carb to the front and any minute fluctuations in pressure show up there. Im also a little worried about the seats for the idle mix screws.

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    Re: Couple of carb questions.

    Quote Originally Posted by Marnix View Post
    Hi

    OK, here we go (again).

    Set the mixture to quite rich before starting. On the E3, the mixture screws have a fine thread, so that is several turns out from fully in. The E3 provides with ports to balance the carbs. With a suction measurement tool, first set the balance between the two blocks, then the internal balance between the two sides of each block, then the balance between the blocks again, and so on, till the four inlet have the same suction. Adjust the slow running RPM screw all the while to the recommended 800-900 RPM (best use an good RPM counter, don't trust the Lancia rev counter for accuracy).
    adjust the mixture screws as follows: turn in slowly making it leaner. The RPM will normally strat to go up. At a certain flat point, it will reach maximum, then very slighty will go down slightly if you continue turning, and then quite abruptly will go down significantly. Turn the mixture richer (out ) again at this point, very slowly, just till the RPM pics up again. That's aproximately the right idle mixture setting. You need to keep adjusting idle and also balance all the time while doing so, all the setting screws influence eachother. I do kind of iteration, first an initial aprox setting, then a next cycle finer adjusting, etc...
    As to close off the screws. Often paint is used. I prefer to put in some gray putty that stays soft, so that I can readjust later by going with the screwdriver through the putty.
    Marnix
    Thanks for your complete knowledge and tutorial reguarding the E-3 carbs. I was using the same method as the normal phh and becoming frustrated with my lack of success. After a few hours of quality time my car is now ideling quite happily without stumble or fouling. Liking many of the improvements found on the E3, especially the vacuum ports on each barrel making balance adjustments a breeze.

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    Re: Couple of carb questions.

    Quote Originally Posted by Miguelarroz View Post
    Liking many of the improvements found on the E3, especially the vacuum ports on each barrel making balance adjustments a breeze.
    Yes. After over 10 years of development on the C.3x PHH, they got it finally about right with the E3!
    Lancia Fulvia 2C 1964
    Lancia Fulvia Coupe Rallye 1,3 1968
    Porsche 924 1979
    Alfa Romeo 33 1.4IE 1993

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    Re: Couple of carb questions.

    regarding the putty to secure the screws, i'm trying plumbers putty. it's a soft grey material used for sealing sink drains and the like. i'm hoping it won't get hard over time, but we'll see. at least it's very cheap and cost's nothing to replace.
    bmarler/
    1967 fulvia sport zagato
    1961 appia vignale convert.

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    Re: Couple of carb questions.

    I`ve in the past used plasticine (modelling clay it might otherwise be known as).

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