New carburettors. What would you do? | FerrariChat

New carburettors. What would you do?

Discussion in '308/328' started by Pero, Jul 27, 2015.

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  1. Pero

    Pero Formula Junior

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    Just bought a complete set of carburettors for my 208 GT4. Brand new, never used. They look like a piece of art!

    What would you do before installing them? Nothing? Do I need new o-rings etc.? I guess that float levels is probably set by the factory since it is "inside" the carbs?

    Peter
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    Last edited by a moderator: Sep 7, 2017
    Pero, Jul 27, 2015
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  2. Sean F.

    Sean F. F1 Rookie

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    Sealed bearings on the throttle shaft. The existing greased bearing surely leak by now.

    Maybe also new lead at the ports where gas leaks out of the rest of ours.
     
    Sean F., Jul 27, 2015
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  3. Pero

    Pero Formula Junior

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    I was hoping to avoid changing to sealed bearing, at this moment. The carbs have not been subjected to any heat so maybe the original seal- grease is still air tight. But you are probably right. The lead plugs are still covered by a layer of laquer and looks, well, like new. I think they are ok.
    Thanks,
    Peter
     
    Pero, Jul 27, 2015
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  4. mike996

    mike996 F1 Veteran

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    Go completely through the carburetors just as if you were totally rebuilding and adjusting them. There is no such thing as a "new" carburetor that is correctly adjusted/clean/ready to install…whether it's old, NOS, or brand new.
     
    mike996, Jul 27, 2015
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  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ Lifetime Rossa

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    Are they 34 DCNF 82/83/84/85? (That is, are they each marked 82, 83, 84, 85 somewhere?)
     
    Steve Magnusson, Jul 27, 2015
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  6. Pero

    Pero Formula Junior

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    Ok, I am a bit scared by this job. Have done everything on the car myself, but have read stories about bending carb shafts... You have to grind the screw before attempting to unscrew it if I remember it correct.

    Well, I will go through them completely. At least I start with clean carbs!
    Peter
     
    Pero, Jul 27, 2015
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  7. Pero

    Pero Formula Junior

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    Yes, the base is marked 34 dcnf 53-54-55-56. This is correct according to the owners manual. 34 seems to be an odd size. I haven't found any other car using them. Rare. 40 is more common.

    Peter
     
    Pero, Jul 27, 2015
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  8. 2NA

    2NA F1 World Champ Consultant Owner Professional Ferrari Technician

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    Verify that all internal parts are correct (numbers are stamped on them) and floats are set right.

    It will never be easier to do than right now and if there are problems getting everything running right you will already know what isn't the problem.
     
    2NA, Jul 27, 2015
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  9. Pero

    Pero Formula Junior

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    Last edited by a moderator: Sep 7, 2017
    Pero, Jul 27, 2015
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  10. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ Lifetime Rossa

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    Thanks - that's good information that you've posted.

    Just for comparison, here's how they "tweaked" some of the internal things per the later 1980 208 188/80 OM (and changed the identification sequence to 82-83-84-85):
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    Last edited by a moderator: Sep 7, 2017
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  11. Pero

    Pero Formula Junior

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    Yes, you are right.
    Peter
     
    Pero, Jul 27, 2015
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  12. Pero

    Pero Formula Junior

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    It would be interesting to try this setting. They must have figured out something useful over the years. I can't really interpret the effect of the differences. Are these environmental changes or performance changes? I would try if the later.

    Peter
     
    Pero, Jul 27, 2015
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  13. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ Lifetime Rossa

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    Yes, such a complicated interaction of so many things that it's not easy to know what they were trying to achieve. I'd guess more "environmental" since the size of the main jet is reduced, but maybe they did that just to be able to run a slightly larger slow running jet? The difference are small so, unless you had a specific problem, I'd just use your stock 53-54-55-56 configuration.

    What is the print number for your OM (XXX/YY)? If you ever get it scanned into an electronic format, please send it to [email protected] (so he can add it to All Ferraris).
     
    Steve Magnusson, Jul 27, 2015
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  14. Pero

    Pero Formula Junior

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    Thank you for your advice. I will stick to the original setting. I have it as a pdf somewhere. I will send it as soon as I can find it. The numbers on the OM are 102/75.
    Found it at Ferraridatabase!
    Peter
     
    Last edited: Jul 27, 2015
    Pero, Jul 27, 2015
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  15. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ Lifetime Rossa

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    No need if it's already there -- I didn't realize that he had put "Dino" in the title (so it got moved in the alphabetical list).
     
    Steve Magnusson, Jul 27, 2015
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  16. BigTex

    BigTex Seven Time F1 World Champ Owner Rossa Subscribed

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    Recall that by 1980 you really had two carb set ups...

    The 1978-79s here in the US were running catalysts at that point, while the last of the carbed Euros, were not...

    Any thoughts as to jetting changes, while they are on the bench, to allow for the modern 10% ethanol blends???
     
    BigTex, Jul 28, 2015
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  17. George Vosburgh

    George Vosburgh F1 Rookie Silver Subscribed

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    Agreed, I would look into changing the jet sizing.
     
    George Vosburgh, Jul 28, 2015
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  18. Pero

    Pero Formula Junior

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    Interesting, there might be an idea re-jetting even though the changes in size are small. So there will be a typical alco re-jetting for all carbs still using the original pure petrol setting?

    Peter
     
    Pero, Jul 29, 2015
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  19. Pero

    Pero Formula Junior

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    Noticed that float level have also changed. 48 mm in 1975 to 50 mm in 1980.

    Peter
     
    Pero, Jul 29, 2015
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