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Thread: 888/926 racing head, how to recoginze?

  1. #1
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    Default 888/926 racing head, how to recoginze?

    Hello,
    I have at home two heads empty, one marked in the top 92 and one marked 93, they appear like racing heads because the combustion chamber is different from road models and the valves seats are very big, seem suitable for 36-30 valves.
    How to recognize if are 888 racing or 926 heads?
    I have a complete set of inlet (36mm) and exhaust (30mm) valves new from Menon for this heads, so I'm thinking to complete them but before I would like to know what they are...
    Thanks

  2. #2
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    Default

    I think from memory the race heads had copper beryllium seats.

  3. #3
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    Originally, they were using 92 stamped heads, with a big S on the top.

    36/31 valves on R93 bikes, and 37/31 valves on R94.
    May be replaced to use 996 valves (36/30) which are easier to find and cheaper than original ones ???

    Inside the combustion chamber, it looks like the photo below.

    (36/30 Chrome Menon valves are the 748RS valves, replacing the previous nimonic valves version)
    Attached Images

  4. #4
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    Default

    image.jpg

    image.jpg

    image.jpg

    image.jpg

    image.jpg

    image.jpg

    Here the photos, no berillium seats or S stamped on the top.
    What for me is strange is the top of the horizontal head marked 92 that is short and without the Desmo 4v Dohc lettering, I see this kind oh heads only years later. Also the combustion chambers for me have a strange design.
    What you think?
    The head gasket sign the head with a diameter of 96mm inside.

  5. #5
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    916 heads for me, maybe used on a modified 955 engine and 996 valves.

    The inside combustion chamber design is a common modification.

    I had also started to made it on mines (but with std valves).
    First time I made that, and I've had no good pics of details of Racing/prepared heads at that time.




    to finish finally more hemispherical
    Last edited by BABA; 07-13-2016 at 04:39 PM.

  6. #6
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    Maybe but 916 started his life in 1994 and these are marked 92 and 93. I have 916 heads marked 94 so something is strange.
    I never look inside an 888 Sp4 or Sp5 so I don't know the combustion chamber of these.

  7. #7
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    Default 926 or 955

    Hi, I see this heads with stamp G and withou letering on Ducati 916 SP from 1994. this bike have frame nummer 00043. But there is bore 94 mm. Ducati made also 916 SPA with engine 955. They used for 955 engine same /G/ heads like normal 916 SP but with big valves.

  8. #8
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    First moulding weren't from 1994.
    I think I remember reading they began to study a new head "lower" in 1991. But I don't think it was used before the 916.
    I should have precised that the head without desmo 4V DOHC are used on 916 SP and R/F.
    I don't know what "B" originally means, but "G" is a classic cylinder head with 34/30 valves (so it could be an SP5 head, I don't remember if the rear 916SP head is the same as the 888, which I think could be the rear and front of an 916 SP)
    The manufacturing of SPs bikes was started at the end of the previous year of the MY in question, so first 916 SPs have been produced at the end of 1993.
    Last edited by BABA; 07-14-2016 at 01:38 AM.

  9. #9
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    Ok thank you very much for your help.
    I have a 916sp head casting so I can check the dated stamped and also the later.
    In the evening I will update the post!


  10. #10
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    Default 916 SP Heads

    Only front head on 916 SP1-3 is without letter. Rear is same like SP5 or SPS with 34/30 valves

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