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Thread: Dcoe jetting - anyone identify ?

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    World Champion Decade Plus User alladdin's Avatar

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    Dcoe jetting - anyone identify ?

    I know it's a silly question really but just curious if this is s known configuration.
    I just acquired a set of 3 prog. Hole 45 152 carbs. Possibly from a zetec setup which may explain
    Chokes 36
    Idles 60 f6
    Main 110
    Emulsion f11
    Air 155

    Any thoughts ?


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    Re: Dcoe jetting - anyone identify ?

    110 main jet is very unlikely with a 60 idle jet.
    Check if the main jets have been bored out.

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    Re: Dcoe jetting - anyone identify ?

    Big idle jet tiny main, with 36mm chokes that would run massively lean on any engine

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    World Champion Decade Plus User alladdin's Avatar

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    Dcoe jetting - anyone identify ?

    Yes I wondered if the big idle was to overcome zetec flat spot but 110 seems too small even for 1800. I will check if it's drilled.


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    Re: Dcoe jetting - anyone identify ?

    That would make transition worse, it would go rich to massively lean

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    World Champion Decade Plus User alladdin's Avatar

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    Re: Dcoe jetting - anyone identify ?

    generally with zetecs the prescribed cure for the progression flat spot is to richen the idle jets, its the small main thats odd

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    Re: Dcoe jetting - anyone identify ?

    Yeah, that would create a much bigger flat spot on transition, I doubt it would even run

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    World Champion Decade Plus User alladdin's Avatar

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    Re: Dcoe jetting - anyone identify ?

    i have just checked and they are not drilled - i'm wondering if someone has jet swapped prior to selling at some point................
    anyway, i will be trying them during next few months on a pinto 2.0 self ported, fr32, compression raised by 1.25 head skim.
    now from my research it appears the std supplied factory jetting should get me close.
    i also see that its possible to drill the f6 to f8 and then f9 which will help.
    and from what leon has said in the past i dont think the E tube will matter to much f11 / f16 ?
    opinions welcome.

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    Re: Dcoe jetting - anyone identify ?

    E tubes matter a huge amount, they alter the fuelling everywhere. Use f11 change idles to 50-55 ish if you have them, drill main jet to 150 (1.5mm) then see how fuelling is towards top end and potentially change AC to about a 180, getting the idle to main is the first and most important part.
    Last edited by Erikmex; 01-10-2018 at 21:30.

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    World Champion Decade Plus User alladdin's Avatar

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    Re: Dcoe jetting - anyone identify ?

    i should have been clearer in that he said they are less important in a mild state of tune. possibly your actually agreeing by pointing at f11 as most seem to use f16

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    Re: Dcoe jetting - anyone identify ?

    E-tube selection is crucial in any state of tune. I’ve always found f11’s work well in Pintos

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    Re: Dcoe jetting - anyone identify ?

    In my experience changing the emulsion tubes in a std engine with small-ish carbs (like 2 litre Pinto with std cam and twin 40's) doesn't change alot. With an engine with a FR32 and twin 45's it will matter (alot). Like Erikmex said F11's will work well.

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    Dcoe jetting - anyone identify ?

    Leon - apologies for the misquote 😊
    (I read a lot of old posts the other night while having a bevy ! )
    And thank you both for the ( valued) advice.
    I do have both as it happens and was going to use the f16 but will go with the f11.


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    Re: Dcoe jetting - anyone identify ?

    I used to always use f16’s in Pintos until I discovered how much better f11’s were across all revs, shame you didn’t post this in summer as I had some f11 vs 16 afr graphs from my car. I’ll try and find them on my laptop

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