Building the Felgiebel

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

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  1. Mar 6, 2018 #1

    rweber

    rweber

    rweber

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    Dear all,

    after finish the Mono (http://www.homemodelenginemachinist.com/showthread.php?t=27456) I was looking forward to find a new project. When beeing at an exhibition I meet a guy that was showing an Felgiebel engine. It's supposed to be one of the first model engines available in Germany for home builders. Designed by A. Felgiebel at about 1939. The plans together with detailed building instructions were publishd in a book named Benzinmotoren und ihr Selbstbau, A. Felgiebel, 1939. I was able to buy a complete book from an ancient library to a moderate price.
    Compared to the Mono, this design is completely different. While the Mono consists of about nearly 600 parts this two-stroke engine is an example for simplicity. But there is one challange: The crank case and cylinder head are aluminium castings. I've never done that before, but I always wanted to do. If someone is interested, here are a few pictues.

    regards,
    Robert
     
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  2. Mar 6, 2018 #2

    rweber

    rweber

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    First i build a 3D printed model of the crank case, ground coated a grinded.

    001.jpg

    002.jpg
     
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  3. Mar 6, 2018 #3

    rweber

    rweber

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    and put it into the sandbox.

    003.jpg

    004.jpg
     
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  4. Mar 6, 2018 #4

    rweber

    rweber

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    but the results are not so bad for a first try

    IMG_20180112_131255.jpg

    005.jpg

    006.jpg
     
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  5. Mar 6, 2018 #5

    rweber

    rweber

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    and milling the backside

    007.jpg

    IMG_20180203_141843.jpg
     
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  6. Mar 6, 2018 #6

    rweber

    rweber

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    and final internal turning.

    IMG_20180204_093258.jpg

    IMG_20180204_134845.jpg

    IMG_20180205_172728.jpg

    IMG_20180207_134428.jpg
     
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  7. Mar 6, 2018 #7

    rweber

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    and a Wohlhaupter is all you need :thumbup:

    IMG_20180207_172556.jpg

    IMG_20180210_170022.jpg
     
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  8. Mar 6, 2018 #8

    Herbiev

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    Coming along nicely
     
  9. Mar 9, 2018 #9

    rweber

    rweber

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    to the cylinder

    IMG_20180211_172328.jpg

    IMG_20180212_173813.jpg

    IMG_20180212_181131.jpg
     
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  10. Mar 9, 2018 #10

    rweber

    rweber

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    cylinderhead's holes

    IMG_20180221_175853.jpg
     
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  11. Mar 9, 2018 #11

    rweber

    rweber

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    and mill the ports

    IMG_20180224_133144.jpg

    IMG_20180224_173615.jpg
     
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  12. Mar 9, 2018 #12

    rweber

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    in the workshop. I should consider to install a better isolation :cool:

    IMG_20180228_153635.jpg
     
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  13. Mar 9, 2018 #13

    rweber

    rweber

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    Casting was quite successfull, I have got five good crankcases. I took the best three of them. But building three identical engines would be boring. So, here are my variations. On the left side, the watercooled version, in the middle my own idrea and on the right side, the original as described in the plans.

    IMG_20180309_180546.jpg
     
  14. Mar 10, 2018 #14

    Mechanicboy

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    Hi, is it not too high transferport and too low exhaustport in the sleeve?

    felgiebel.jpg
     
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  15. Mar 10, 2018 #15

    ZAPJACK

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    To help you in this nice project, here is a couple of pictures of the Felgiebel
    Nice job !
    LeZap

    003.jpg

    004.jpg

    005.jpg

    006.jpg

    007.jpg

    008.jpg

    009.jpg

    010.jpg
     
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  16. Mar 10, 2018 #16

    Mechanicboy

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    Now i can see the exhaust port is in other side of the cylinder. :)
     
  17. Mar 11, 2018 #17

    rweber

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    Thanks for providing that pictures. You mounted it on a nice stand :thumbup:
     
  18. Mar 11, 2018 #18

    rweber

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    Yep you are right. See the picture I attached, that shows the locations.

    ports.PNG
     
  19. Mar 11, 2018 #19

    rweber

    rweber

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    Does somboedy know, whats the purpose of this screw? Some Felgiebels have one, some not. And it is not drawn on the plans.

    regards,
    Robert

    009.jpg
     
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  20. Mar 11, 2018 #20

    Barnbikes

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    Drain the crankcase if you ever flood it?

    Some dirt bikes and snowmobile use to have them.
     

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