Valve Seals

Discussion in 'Volkswagen' started by Marc W, Aug 24, 2018.

Help Support HomeBuiltAirplanes Forum by donating:

  1. Aug 24, 2018 #1

    Marc W

    Marc W

    Marc W

    Well-Known Member

    Joined:
    Apr 1, 2017
    Messages:
    316
    Likes Received:
    219
    Location:
    Colorado
    I have the heads off my 2180 cc Hummel engine and I see that there aren't any valve seals. I am not familiar with VW's. I have rebuilt a bunch of US cast iron engines and they all use valve seals. Is it normal to not use valve seals in a VW aircraft engine?
     
  2. Aug 24, 2018 #2

    samyguy

    samyguy

    samyguy

    Well-Known Member

    Joined:
    Sep 20, 2011
    Messages:
    109
    Likes Received:
    19
    Location:
    Lincoln Nebr
    I'm doing one now,before you install the new valve guides, have them turned on a lathe,
    to fit vw rabbit valve seals, or other 8mm valve seals
     
  3. Aug 24, 2018 #3

    samyguy

    samyguy

    samyguy

    Well-Known Member

    Joined:
    Sep 20, 2011
    Messages:
    109
    Likes Received:
    19
    Location:
    Lincoln Nebr
  4. Aug 24, 2018 #4

    samyguy

    samyguy

    samyguy

    Well-Known Member

    Joined:
    Sep 20, 2011
    Messages:
    109
    Likes Received:
    19
    Location:
    Lincoln Nebr
  5. Aug 24, 2018 #5

    Hot Wings

    Hot Wings

    Hot Wings

    Well-Known Member HBA Supporter

    Joined:
    Nov 14, 2009
    Messages:
    6,529
    Likes Received:
    2,448
    Location:
    Rocky Mountains
    Or just use the matching rabbit guides. They come turned for the seals and are just a bit shorter than the air-cooled guides. Work great on ground bound VWs with oil flow mods* but are they really needed for aircraft that operate at low manifold vacuum?

    *Hoover and I disagreed on the short guides for intakes. I never saw any problems with stock cam profiles.
     
  6. Aug 24, 2018 #6

    Pops

    Pops

    Pops

    Well-Known Member

    Joined:
    Jan 1, 2013
    Messages:
    7,367
    Likes Received:
    6,317
    Location:
    USA.
    Can't see any difference with seals or not, so I don't use valve seals.
     
  7. Aug 25, 2018 #7

    Marc W

    Marc W

    Marc W

    Well-Known Member

    Joined:
    Apr 1, 2017
    Messages:
    316
    Likes Received:
    219
    Location:
    Colorado
    I read Hoover's blog. It seems to be focused on car engines. I also got the novel idea of calling Scott Casler. He originally built the engine but these are replacement heads so I don't know any history on them. Anyway Scott is always helpful and he said about what Pops said. He doesn't use valve seals. Good enough for me! Thanks to all for your comments.
     

Share This Page



arrow_white