Demon V8 (multiplied 1.5)

Discussion in 'A Work In Progress' started by Foketry, Sep 24, 2019.

Help Support HMEM by donating:

  1. Nov 25, 2019 #61

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    The final check on motor block

    IMG_8904.JPG
     
    burkLane and dnalot like this.
  2. Nov 25, 2019 #62

    awake

    awake

    awake

    Well-Known Member HMEM Supporter

    Joined:
    Sep 5, 2019
    Messages:
    91
    Likes Received:
    18
    Gender:
    Male
    Occupation:
    Educator
    Location:
    North Carolina
    Very impressive work!

    I'd love to know more about how you use the block with the five holes in picture 8898. I assume it lets you do the offsets for the various cranks, but I'm not clear on how you would line things up - unless there are matching centers in the opposite end of the crank shaft?
     
  3. Nov 25, 2019 #63

    stevehuckss396

    stevehuckss396

    stevehuckss396

    Model Engineer Project of the Month Winner HMEM Supporter

    Joined:
    Nov 19, 2008
    Messages:
    4,128
    Likes Received:
    1,021
    Gender:
    Male
    Occupation:
    Construction
    Location:
    Sterling Heights, MI
    Very nice! That grinder looks like it would come in handy.
     
  4. Nov 26, 2019 #64

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    yes, as you think , on the opposite side there are the same matching centers for cranks
    The screw you see in the photo is to drag the crankshaft through the lathe chuck
     
  5. Nov 26, 2019 #65

    xpylonracer

    xpylonracer

    xpylonracer

    Well-Known Member

    Joined:
    Dec 23, 2010
    Messages:
    253
    Likes Received:
    60
    Is that wood packing between the crankwebs ?
     
  6. Nov 27, 2019 #66

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    yes, it is hardwood glued with epoxy
     
    xpylonracer likes this.
  7. Nov 27, 2019 #67

    awake

    awake

    awake

    Well-Known Member HMEM Supporter

    Joined:
    Sep 5, 2019
    Messages:
    91
    Likes Received:
    18
    Gender:
    Male
    Occupation:
    Educator
    Location:
    North Carolina
    Understood. Thanks!
     
  8. Dec 2, 2019 #68

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    The valves, made from a stainless steel bar


    IMG_8918.JPG
     
  9. Dec 2, 2019 #69

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    the steel chips produced by one valve

    IMG_8923.JPG
     
  10. Dec 2, 2019 #70

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    all the valves +3

    IMG_8944.JPG
     
    Last edited: Dec 4, 2019
    kuhncw likes this.
  11. Dec 3, 2019 #71

    awake

    awake

    awake

    Well-Known Member HMEM Supporter

    Joined:
    Sep 5, 2019
    Messages:
    91
    Likes Received:
    18
    Gender:
    Male
    Occupation:
    Educator
    Location:
    North Carolina
    It's hard to express just how impressive that picture is.

    It might seem simple enough. I can imagine some <clueless> person saying, "it's just 17 little rod thingies, right?" Oh, yeah - "just" 17 *identical* pieces, representing hours upon hours upon hours of exacting work, that's all!

    I'm feeling daunted at the prospect of making 2 valves for my first IC engine attempt. I see this picture and I'm in awe!
     
  12. Dec 3, 2019 #72

    Michael Rosenbauer

    Michael Rosenbauer

    Michael Rosenbauer

    Active Member

    Joined:
    Nov 11, 2019
    Messages:
    26
    Likes Received:
    8
    Gender:
    Male
    Occupation:
    Laith operator, Milling Machine operator, cnc op
    Location:
    Germany
    Why do you make 19 valves?
    But as usual at your pictures, very very nice. What do you thing you are finished and running the V8.
    Is it a x-mas gift for somebody?:D
     
  13. Dec 4, 2019 #73

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    I worked one day to make the first 2 valves, scraps, I found the right tool with a very small tip radius, many small turning steps of 0,2 -0,3 mm to avoid bending the valve , in total about 4 days to get 19 valves
     
  14. Dec 4, 2019 #74

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    better to have some spare parts, when I assemble the valves in the seats and do the vacuum test, if there are any leaks, I replace them
    If all goes well, I hope to hear the first bursts at the end of January / February :)
     
  15. Dec 8, 2019 at 1:25 PM #75

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    The rocker stud

    IMG_8946.JPG
     
  16. Dec 8, 2019 at 1:28 PM #76

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    The pistons, hole drilling

    IMG_9119.JPG
     
  17. Dec 8, 2019 at 1:30 PM #77

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    piston , internal milling


    IMG_9131.JPG
     
    kuhncw likes this.
  18. Dec 8, 2019 at 1:37 PM #78

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    IMG_9132.JPG

    the piston assembled with small screw to fix the wrist pin
     
  19. Dec 8, 2019 at 2:11 PM #79

    Michael Rosenbauer

    Michael Rosenbauer

    Michael Rosenbauer

    Active Member

    Joined:
    Nov 11, 2019
    Messages:
    26
    Likes Received:
    8
    Gender:
    Male
    Occupation:
    Laith operator, Milling Machine operator, cnc op
    Location:
    Germany
    Hey Foketry it looks like you make the piston cylindric!
    Didn´t you make them a little conical 0.04mm smaler on top regarding the expansion by heating up during running?
     
  20. Dec 8, 2019 at 10:32 PM #80

    Foketry

    Foketry

    Foketry

    Well-Known Member HMEM Supporter

    Joined:
    Sep 12, 2014
    Messages:
    192
    Likes Received:
    119
    Location:
    Modena (land of motor) Italy
    My pistons have no taper or diameter reduction on top.
    These model engines have no hardened parts, camshafts, crankshafts, valve seats etc, so they can't run continuously for hours and hours, just a few minutes each time.
    This means that they do not reach high temperatures, in my opinion the conical or smaller piston on top is not necessary.
    Also the piston drawing , designed by Steve Huck does not require smaller on top.
    In any case reduced on top it can be done, it is a technical perfection absolutely necessary for larger engines
     

Share This Page