Valve seals - anyone has done any measurement for the valve seals ? | FerrariChat

Valve seals - anyone has done any measurement for the valve seals ?

Discussion in 'Boxers/TR/M' started by leslie_choo, Apr 25, 2016.

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  1. leslie_choo

    leslie_choo Formula Junior

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    #1 leslie_choo, Apr 25, 2016
    Hi do you know the size for testarossa valve seals ? Or any compatible valve seals from other car that could fit testarossa ? Thanks


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  2. turbo-joe

    turbo-joe F1 Veteran

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    #2 turbo-joe, Apr 26, 2016
    valve seals? so you mean those seals on the valve guides?
    steem diameter ofthe valves is 7 mm, where the seals go on the guides I don´t know the diameter

    you may have a look t a motorcycle shop, a lot of motorcycles with 800 ccm an dmore have valve shaft with 7 mm
     
  3. Rifledriver

    Rifledriver Three Time F1 World Champ

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    #3 Rifledriver, Apr 26, 2016
    Last edited: Apr 26, 2016
    If you tell us what type of valve stem seal you want I might have a part number for you. If you really want those terrible Teflon seals I won't be able to help. I just say no to Teflon seals.
     
  4. turbo-joe

    turbo-joe F1 Veteran

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    #4 turbo-joe, Apr 26, 2016
    the teflon seals work fine - but to install them it is terrible :(
     
  5. leslie_choo

    leslie_choo Formula Junior

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    #5 leslie_choo, Apr 26, 2016
    Thanks , I read from the internet that there is Viton stem seal supposed to be better than the rubber stem seal . So if you do have part number for that will be good . Btw Is the Teflon stem seal always in white ?


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  6. turbo-joe

    turbo-joe F1 Veteran

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    #6 turbo-joe, Apr 26, 2016
    teflon is always in white
    viton is green
     
  7. vincenzo

    vincenzo F1 Rookie

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    #7 vincenzo, Apr 26, 2016
    Last edited by a moderator: Sep 7, 2017
    ...and will cold flow. I have not used it in valve stem seals before - and would need to be convinced before using it.

    What is your experience with teflon? Good? Bad? How about over time and mileage?

    rgds,
    vincenzo
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  8. vincenzo

    vincenzo F1 Rookie

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    #8 vincenzo, Apr 26, 2016
    Last edited by a moderator: Sep 7, 2017
    Viton is a bit harder than buna - but otherwise has great properties. Some applications are better suited to buna. Note the "moderate" short term resiliance.
    rgds,
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  9. turbo-joe

    turbo-joe F1 Veteran

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    #9 turbo-joe, Apr 26, 2016
    Last edited by a moderator: Sep 7, 2017
    vincenzo
    you may see the difference between O-rings and valve seals with different materials
    viton O-rings are the best I think, but only because the O-rings are in a nut and cannot move much. valve seals have not to get fixed and viton I think is too hard for valve seals?

    best I ever had for the old V12 F engines ( colombo serie ) are the seals from the old german NSU TT, those seals have been made of rubber and the inner diameter for the valve stems have been teflon, but only available for 8 mm valvestems
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  10. Rifledriver

    Rifledriver Three Time F1 World Champ

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    #10 Rifledriver, Apr 26, 2016
    We thought they worked fine in the 70's but we figured out we were wrong.
     
  11. Rifledriver

    Rifledriver Three Time F1 World Champ

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    #11 Rifledriver, Apr 26, 2016
    Viton has proven to be best.

    I use a lot of 2 numbers of seals. One fits all the 4 valve heads and one fits all the 5 valve heads. If this number is for the 5 valve I apologize because it is the only one I can find right now.

    It is U.S. Seal #VS518V
    It fits some 1.6L Nissan
     
  12. Rifledriver

    Rifledriver Three Time F1 World Champ

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    #12 Rifledriver, Apr 26, 2016
    Throw them in hot water and they go on easy but still a terrible seal.
     
  13. turbo-joe

    turbo-joe F1 Veteran

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    #13 turbo-joe, Apr 27, 2016
    brian
    I never use those seals again :)
     

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