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Thread: 785 PROject

  1. #251
    MSX 150 guy lives on Mr. GP1800's Avatar
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    Quote Originally Posted by 785 lugs View Post
    I have a bunch of domestic race pipes never welded together if your interested there pretty much identical to hotseat pipes

    You should list list what you don’t have. It would be a shorter list.

  2. #252
    rpa101's Avatar
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    Squish area is 0.040 without o -ring installed on dome and 0.050 with o-ring installed
    so now to cut the other two domes to match the recut one I have done

  3. #253
    Moderator beerdart's Avatar
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    The o-ring should not be .010 high the squish should be the same with or without o-ring.
    Quote Originally Posted by rpa101 View Post
    Squish area is 0.040 without o -ring installed on dome and 0.050 with o-ring installed
    so now to cut the other two domes to match the recut one I have done

  4. #254
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    Quote Originally Posted by beerdart View Post
    The o-ring should not be .010 high the squish should be the same with or without o-ring.
    That’s what I thought, all I had to measure it was a old vernier calliper
    i am going to bring my mic home and recheck
    i don’t think I’m going to change it anyway, just blend the bowl to it and call it a day
    when all are cut I will redo a compression check on a dry cylinder and see what it is , I checked them wet which can increase it a bit

  5. #255
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    After measuring again with my micrometer it’s 0.044 “

  6. #256
    Moderator beerdart's Avatar
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    .044 is huge and your o-ring will not last. Sounds like you have an american o-ring in a metric grove. What are the o-ring grove dimensions? width and depth?


  7. #257
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    Quote Originally Posted by beerdart View Post
    .044 is huge and your o-ring will not last. Sounds like you have an american o-ring in a metric grove. What are the o-ring grove dimensions? width and depth?
    I think you may be right there’s 0.014 difference with the o-ring , I’m at 0.040 no o-ring and 0.054 with o-ring
    The o-ring groove is 78mm od and 72.60mm id 2.00mm deep
    the o-ring I have is 2.45mm thick ,that’s the problem
    Last edited by rpa101; 02-12-2019 at 12:55 AM. Reason: Spelling

  8. #258
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    When I was measuring for o-rings I didn’t measure the depth I assumed it was the same as width, I guess I should never assume

  9. #259
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    I see they have 2 mm and a 2.5mm
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  10. #260

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