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Thread: Head/cam change and jetting

  1. #1
    Bodger

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    Head/cam change and jetting

    2l pinto, running gp1 44IDFS. Its been set up on the rolling road with standard head and FR31 cam.
    Im fitting a Vulcan ultimax big valve head and FR32 cam. Is the jetting going to need tweaking ? (In my head its sucking in the same mixture just more of it so no ) . Thanks

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    Mechanic

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    Re: Head/cam change and jetting

    I'd gess it wants setting up on a dyno again, if you leave them as befor you will ha e the same power ish but proberbly run lean as its flowing more air with the same amount of fuel,

    Someone like graham will be along soon , he will know tho

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    Re: Head/cam change and jetting

    Yes the jetting will need changing.
    What chokes (venturi's) are you using, 34mm or 36mm?

  4. #4
    Bodger

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    Re: Head/cam change and jetting

    Thanks Ill have a look tomorrow and put jet settings up also

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    Bodger

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    Re: Head/cam change and jetting

    post RR jet settings on FR31 cam

    carb: 44 IDF 40/41 (escort 2000 RS)
    choke size: 34
    Auxilary venturi: 4.50
    main jet: 1.35
    idle jet: 0.55
    air idle jet/hole: 1.30
    Emulsion tube: F11
    air corrector jet: 1.80
    starter jet: 0.90 F55
    accelerator pump jet: 0.40
    accelerator pump back bleed: 0.80
    needle valve: 1.75

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    Re: Head/cam change and jetting

    Replace main jet with a 145 item and leave the rest as it is.
    Maybe you can get away with a 140 main jet and a 57 idle jet but it could go a bit lean on top end.

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  8. #7
    Bodger

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    Re: Head/cam change and jetting

    ok thanks

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