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valve guide broacing

Discussion in 'Technical Q&A' started by INDEX_38, Jun 2, 2017.

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  1. INDEX_38

    INDEX_38 Rookie

    Jun 2, 2017
    1
    #1 INDEX_38, Jun 2, 2017
    Howdy. I am looking for a picture of a Ferrari typical cylinder head valve guide broach system in use. I am contemplating the design of a similar valve guide broach for another make engine.

    Please do not confuse a reamer system with a broach. Any pictures, etc. would be much appreciated.
     
  2. Dave rocks

    Dave rocks F1 World Champ
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    #2 Dave rocks, Jun 2, 2017
    Last edited: Jun 2, 2017
    Bad idea. A broach will leave a surface finish not as good as ream / bore / burnishing.
     
  3. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
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    Brian Crall
    #3 Rifledriver, Jun 3, 2017
    No one actually uses broaches. The factory offers them in case you live in the mountains of Tibet and need to fix your Ferrari.
     
  4. Dave rocks

    Dave rocks F1 World Champ
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    #4 Dave rocks, Jun 3, 2017
    :D :)
     
  5. ago car nut

    ago car nut F1 Veteran
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    David A.
    #5 ago car nut, Jun 4, 2017
    Last edited: Jun 4, 2017
    Broach is typical for a shape that is difficult to machine:(keyway, spine etc.). Bore makes a straighter hole than drill. Ream will finish a hole to size. Hone will give you a nice round smoother finish than ream. Ream could give you little ridges that could hold oil. I can't comment on the best finish for valve guide for particular engine because all my experience was on typical machine work. If you have king pins, hone is better for longer job than ream.
     

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