Building the Felgiebel

Discussion in 'Engines From Castings' started by rweber, Mar 6, 2018.

Help Support HMEM by donating:

  1. Aug 27, 2018 #61

    Pierkemo

    Pierkemo

    Pierkemo

    Member

    Joined:
    Feb 17, 2014
    Messages:
    7
    Likes Received:
    1
    Whaaawww, very nice build!!!!!
    Also very wel done, the castings!!

    Pierkemo
     
  2. Sep 1, 2018 #62

    rweber

    rweber

    rweber

    Well-Known Member

    Joined:
    Nov 19, 2014
    Messages:
    82
    Likes Received:
    95
    Next part is not so easy to build, the contact spring.

    Starting with this:

    IMG_20180830_104207.jpg

    Bending around several times ...

    IMG_20180830_134957.jpg

    after harden, temper and sandblast it looks like this:

    IMG_20180831_102116.jpg

    finally assembled contact:

    IMG_20180831_111739.jpg
     
    almarghi likes this.
  3. Sep 1, 2018 #63

    rweber

    rweber

    rweber

    Well-Known Member

    Joined:
    Nov 19, 2014
    Messages:
    82
    Likes Received:
    95
    Next part to build is the fuel tank.
    I do not like sheet metal work that much :( But it has to be done. The tank is build of a 0.25 sheet of brass.

    First I made a helper tool for forming the caps. The sheet has to be annealed several times to punch it around the radius.

    IMG_20180901_171602.jpg

    Soldered togehter:

    IMG_20180901_172545.jpg
     
    almarghi likes this.
  4. Sep 1, 2018 #64

    Mechanicboy

    Mechanicboy

    Mechanicboy

    Well-Known Member

    Joined:
    Jul 10, 2013
    Messages:
    612
    Likes Received:
    209
    Better to create the tank cover with metal spinning method, it's fact much easier and more beautiful than hammering the edge of tank cover. You can do it on lathe. The brass sheet must be annealed to be soft to form on pattern. See this movie how to spinning the parts..






    Here is the info about metal spinning..
    https://en.wikipedia.org/wiki/Metal_spinning
     
    Last edited: Sep 1, 2018
    rweber likes this.
  5. Sep 2, 2018 #65

    rweber

    rweber

    rweber

    Well-Known Member

    Joined:
    Nov 19, 2014
    Messages:
    82
    Likes Received:
    95
    You are absolutely right. This will be a much better approach. I never could motivate me to create the nessecary tools needed for spinning in the past. Did not need them often in the past. But in the time I spent knocking with the hammer I would already have built them. You make me start thinking...
     
  6. Sep 11, 2018 #66

    rweber

    rweber

    rweber

    Well-Known Member

    Joined:
    Nov 19, 2014
    Messages:
    82
    Likes Received:
    95
    OK, I took the time to create some metall spinning tools for me.
    Now the result looks significantly better than my first try.
    Thanks to Machanicboy!

    IMG_20180910_080234.jpg
     
    almarghi likes this.
  7. Sep 11, 2018 #67

    Mechanicboy

    Mechanicboy

    Mechanicboy

    Well-Known Member

    Joined:
    Jul 10, 2013
    Messages:
    612
    Likes Received:
    209
    The fuel tank cover look much better and beautiful! :cool:
     
  8. Sep 12, 2018 #68

    777engman

    777engman

    777engman

    Member

    Joined:
    Jan 8, 2012
    Messages:
    15
    Likes Received:
    6
    How about some photos of the tools you made for spinning?
    Regards
    Dean
     
  9. Sep 19, 2018 #69

    rweber

    rweber

    rweber

    Well-Known Member

    Joined:
    Nov 19, 2014
    Messages:
    82
    Likes Received:
    95
    Sure, here we go:

    IMG_20180919_093011.jpg

    IMG_20180919_093256.jpg
     
    Mechanicboy likes this.
  10. Sep 20, 2018 #70

    rweber

    rweber

    rweber

    Well-Known Member

    Joined:
    Nov 19, 2014
    Messages:
    82
    Likes Received:
    95
    Some carburettor parts


    IMG_20180914_160334.jpg
    IMG_20180914_162002.jpg IMG_20180919_093153.jpg
     
    minh-thanh likes this.
  11. Sep 25, 2018 #71

    rweber

    rweber

    rweber

    Well-Known Member

    Joined:
    Nov 19, 2014
    Messages:
    82
    Likes Received:
    95
    Some gastank parts

    IMG_20180923_205817.jpg

    and a mounting plate. Used for drilling the careburettors holes and later as testbench.


    IMG_20180922_102209.jpg

    IMG_20180922_105209.jpg
     
  12. Oct 22, 2018 #72

    ixb1

    ixb1

    ixb1

    Active Member

    Joined:
    Feb 16, 2015
    Messages:
    41
    Likes Received:
    23
    Location:
    CZ
    Hi
    Maybe possible solution is simple mold by imprint the head pattern horizontally into sand with fins oriented down.
     
  13. Oct 22, 2018 #73

    rweber

    rweber

    rweber

    Well-Known Member

    Joined:
    Nov 19, 2014
    Messages:
    82
    Likes Received:
    95
    Also tried this way, but the gravity produces to less force, to press the alu down and let the air come out. The result was not better as in the picture you quoted. Perhaps it would work, if you fill the alu very very slowly, but then it would cool down until you are finished.
    Now I'm thinking about a simple centrifugal cast mechanism... I know, the head can be simply milled and turned, but I'm interested if I can get it done this way.
     
  14. Oct 22, 2018 #74

    ixb1

    ixb1

    ixb1

    Active Member

    Joined:
    Feb 16, 2015
    Messages:
    41
    Likes Received:
    23
    Location:
    CZ
    Is acceptable head with thicker wedge profile fins like on old Enya or McCoy engines?
     
  15. Dec 3, 2018 #75

    rweber

    rweber

    rweber

    Well-Known Member

    Joined:
    Nov 19, 2014
    Messages:
    82
    Likes Received:
    95
    Finally I decided to build the heads from a round bar, to get this project done.

    IMG_20181119_210820.jpg IMG_20181119_215652.jpg IMG_20181121_172724.jpg IMG_20181121_201117.jpg
     
  16. Dec 11, 2018 at 11:25 AM #76

    rweber

    rweber

    rweber

    Well-Known Member

    Joined:
    Nov 19, 2014
    Messages:
    82
    Likes Received:
    95
    Ok, alle the parts are completed. Now putting it all together ...

    IMG_20181101_103953.jpg

    This is the watercooled version, also described in the book.

    IMG_20181205_153712.jpg

    This is the "original" version from the book:

    IMG_20181205_153427.jpg

    This is my personal version, some slight modifications. A longer intake tube and a "tuning" head with higher compression. I'm curious to see how it will run ;-)

    IMG_20181205_153532.jpg

    The whole Felgiebel family:

    IMG_20181205_154058.jpg

    and from behind:

    IMG_20181205_153917.jpg

    Can't await to see them (homefully) run.

    More to come....
     
    Mechanicboy and minh-thanh like this.

Share This Page