Carb Jetting/ Venturi Sizing on Renault 688
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Thread: Carb Jetting/ Venturi Sizing on Renault 688

  1. #1
    Tadpole
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    Default Carb Jetting/ Venturi Sizing on Renault 688

    Hi guys,

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    I have a 1969 Simca 1000(called the 1118 here in the states) and a 1967 R10. I am fitting a Dellorto 40 DHLA to it and Im wondering if you guys might have an idea of where to start with the venturi/jetting. I have 28mm chokes in there now. Cheers from California!

    Carb Jetting/ Venturi Sizing on Renault 688-1527344080_img_1132_mmthumb.jpgCarb Jetting/ Venturi Sizing on Renault 688-1527344168_img_1129_mmthumb.jpgCarb Jetting/ Venturi Sizing on Renault 688-1528168216_img_1359_mmthumb.jpg

  2. #2
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    Very nice car but I cannot help with those carbs.

  3. #3
    Fellow Frogger! Shoji's Avatar
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    Yes very nice. Is that R10 with the round eye lights?

    Sent from my Moto G Play using aussiefrogs mobile app
    “Listen very carefully, I shall say this only once.” Cheers. John

  4. #4
    Tadpole
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    Yes. I think thats the only version we got in the states? and thanks!

    Quote Originally Posted by Shoji View Post
    Yes very nice. Is that R10 with the round eye lights?

    Sent from my Moto G Play using aussiefrogs mobile app

  5. #5
    1000+ Posts Frans's Avatar
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    Hi Godzilla, good looking car you have there!!

    I think that the 28 mm chokes will be too small. The only base to work on that I can give you is for twin SD Carbs on the 1400cc.
    There we use in general 32 chokes 110 - 120 main jets and 180 - 200 Air corrections.

    You will have to adapt to the single SD carb from there. Only thing that I am sure of is that the 28 chokes will be too small for feeding 2 cylinders when we are using 32 chokes to feed a single cylinder.

    Regards, Frans.
    Old enough to know better
    Young enough to do it anyway.

  6. #6
    Too many posts! JohnW's Avatar
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    Very nice R10 - thanks for posting here! Good luck with the jetting - I have no idea I'm afraid.
    JohnW

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  7. #7
    COL
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    Get a copy of John Passini's Weber Carburettors.

    There are two books the orange one with the theory and the green one with the Tuning & Maintenance.

    I think the green one has the information in it that you require.
    Stuey likes this.
    Regards Col

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  8. #8
    Tadpole
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    Thanks for the tips! I just ordered a used copy of the green book. I welded in an O2 bung as well for my wideband. It would intrest me to see how the jet and venturi sizing changes mixture in realtime. Ive been doing megasquirt/EFI stuff untill I bought this car. Ill let you know how it goes.

  9. #9
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    Hi
    Just a comment. You cannot just decide on a choke size for that application without some more consideration of what is the state of tune, cam, head work etc. The rev range required and the tractability needed. Basic things to consider first. The jetting follows but will need to be adjusted as needed to get it perfect. The O2 sensor will be your guide if you know which jet controls what !!

    I notice the discussions on here sometimes assume the owner wants a race car for the road. Good if that is what you want, but some people may like a quick sports car with less hassels and more fun. Your choice if you select wiseley. Just saying !!!
    Jaahn
    Shoji likes this.

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