Glow engine

Discussion in 'General Engine Discussion' started by minh-thanh, Jul 19, 2018.

Help Support HMEM by donating:

  1. Aug 4, 2018 #61

    minh-thanh

    minh-thanh

    minh-thanh

    Well-Known Member

    Joined:
    Dec 29, 2016
    Messages:
    510
    Likes Received:
    241
    Location:
    Viet Nam
    kadora !
    Try four stroke glow plug : I will try it .

    ixb1 !
    Ordinary glow engine if it stops when battery is disconnected, it is caused by too rich fuel mix or low compression ratio...But in this method of carburation i dont know.
    Small two stroke also needs plenty of oil for cooling and lubrication. Literarly say oil must spray from exhaust.

    I will check it again.

    Keith whiddett
    it needs a propeller for cooling and much lighter will run faster. Propeller size 9 x 6 or 9x4 : I will try it

    Thanks ixb1 for the plan .
    Thanks for all suggestions .
    I will check and redo....I hope it will be better .
     
  2. Aug 4, 2018 #62

    Mechanicboy

    Mechanicboy

    Mechanicboy

    Well-Known Member

    Joined:
    Jul 10, 2013
    Messages:
    672
    Likes Received:
    223
    There is evaporated fuel into the carburetor instead atomized fuel mix into the carburetor, but it ran! :eek:

    Use ordinary carburetor with spray bar due the engine need oil from fuel to keep compression better + 4 stroke glow plug ("F" stamped on glow plug to example). Compression ratio must be 8:1 -9:1 to keep engine running without battery attached to glow plug and the glow plug is glowing by catalytic reaction from methanol too.

    http://adriansmodelaeroengines.com/catalog/main.php?cat_id=153
     
  3. Aug 5, 2018 #63

    minh-thanh

    minh-thanh

    minh-thanh

    Well-Known Member

    Joined:
    Dec 29, 2016
    Messages:
    510
    Likes Received:
    241
    Location:
    Viet Nam
  4. Aug 5, 2018 #64

    Johno1958

    Johno1958

    Johno1958

    Well-Known Member Project of the Month Winner HMEM Supporter

    Joined:
    Sep 19, 2015
    Messages:
    271
    Likes Received:
    79
    Very nice runner Minh Thanh congratulations :).
    John
     
  5. Aug 5, 2018 #65

    minh-thanh

    minh-thanh

    minh-thanh

    Well-Known Member

    Joined:
    Dec 29, 2016
    Messages:
    510
    Likes Received:
    241
    Location:
    Viet Nam
    Hi all !
    Updated and finished :
    Now it runs without battery connection. It did not work well because I unfix too much, some parts were not good, but it was a learning experience for me, I learned a lot of things when doing it



    Thank you very much ! Thank you all !
     
    Buchanan, ixb1 and Mechanicboy like this.
  6. Aug 5, 2018 #66

    lohring

    lohring

    lohring

    Well-Known Member

    Joined:
    Aug 7, 2011
    Messages:
    314
    Likes Received:
    102
    Two strokes are a great introduction to engine building. They are very simple and work even if not perfectly designed or built. I learned most of what I know about manufacturing by building a model racing engine in high school. It was also the start of my fascination with two stroke design.

    In small engines, friction is by far the most important factor because the power producing displacement decreases much more quickly with size than the surface area of parts like the cylinder. Ball crankshaft bearings have become standard. Some engines have also used needle connecting rod big end bearings.

    Sealing also becomes more critical since clearances also don't decrease as quickly as displacement. Before careful machining was standard, ringed aluminum pistons were used in steel (sometimes hardened or chromed) cylinders. The final solution in small engines has been lapped fits between the cylinder and piston using materials with similar rates of expansion. In order of increased performance and difficulty these materials are cast iron on steel, high silicon aluminum on chromed brass, and high silicon aluminum on chromed high silicon aluminum.

    After these considerations, the cylinder head volume is important. It sets the ignition timing for glow engines and needs to be matched with the plug heat range and fuel. Racing engine tuners use head shims and machine lots of head buttons. After all this comes the port shape and timing. Cross flow and reverse flow engines are the easiest to build, but loop flow engines are more powerful with carefully aimed ports and a tuned pipe. All designs can work well with open exhaust. See the pictures below. Tuned pipes have more than doubled the output of today's race engines over the simple engine I built long ago.

    Keep on refining your engine. It will teach you a lot.

    Lohring Miller

    Miller High School Engine.jpg cyl_flows.jpg
     
  7. Aug 6, 2018 #67

    minh-thanh

    minh-thanh

    minh-thanh

    Well-Known Member

    Joined:
    Dec 29, 2016
    Messages:
    510
    Likes Received:
    241
    Location:
    Viet Nam
  8. Aug 6, 2018 #68

    natalefr

    natalefr

    natalefr

    Well-Known Member

    Joined:
    Sep 24, 2017
    Messages:
    148
    Likes Received:
    44
    Gender:
    Male
    Location:
    France
    Your engine is nice good luck :p
     
  9. Sep 2, 2018 #69

    Keith whiddett

    Keith whiddett

    Keith whiddett

    Member

    Joined:
    May 30, 2018
    Messages:
    21
    Likes Received:
    13
    Gender:
    Male
    8D769F44-3B5A-455C-B995-6E32C3CE69C6.jpeg 8D769F44-3B5A-455C-B995-6E32C3CE69C6.jpeg BA0A2BEC-3F29-4EB5-9B69-B7E9EBA49244.jpeg
    At last it’s finnished starts and runs well, still a bit tight so running rich trying to Load video but to high res
     
    mayhugh1 and ixb1 like this.
  10. Sep 2, 2018 #70

    Keith whiddett

    Keith whiddett

    Keith whiddett

    Member

    Joined:
    May 30, 2018
    Messages:
    21
    Likes Received:
    13
    Gender:
    Male
    Video on you tube search for glow engine 3.2cc
     
    Last edited: Sep 2, 2018
    mayhugh1 likes this.
  11. Sep 2, 2018 #71

    ixb1

    ixb1

    ixb1

    Active Member

    Joined:
    Feb 16, 2015
    Messages:
    41
    Likes Received:
    24
    Location:
    CZ
    Very well Keith.
     
  12. Sep 3, 2018 #72

    minh-thanh

    minh-thanh

    minh-thanh

    Well-Known Member

    Joined:
    Dec 29, 2016
    Messages:
    510
    Likes Received:
    241
    Location:
    Viet Nam
    Very well ! Better than my engine :p
     
  13. Sep 4, 2018 #73

    Keith whiddett

    Keith whiddett

    Keith whiddett

    Member

    Joined:
    May 30, 2018
    Messages:
    21
    Likes Received:
    13
    Gender:
    Male
    74309E90-675D-452F-949A-5F086691CE04.jpeg made a new head today, thinks it looks better!!
     
    mayhugh1 and Henry like this.
  14. Sep 10, 2018 #74

    Keith whiddett

    Keith whiddett

    Keith whiddett

    Member

    Joined:
    May 30, 2018
    Messages:
    21
    Likes Received:
    13
    Gender:
    Male
    54C0183C-230E-4B36-93BD-877F7F9398AF.jpeg Now sporting a silencer!!!! Must change the 3mm bolts for mushroom heads!!
     
    ixb1 and minh-thanh like this.
  15. Sep 11, 2018 #75

    minh-thanh

    minh-thanh

    minh-thanh

    Well-Known Member

    Joined:
    Dec 29, 2016
    Messages:
    510
    Likes Received:
    241
    Location:
    Viet Nam
  16. Sep 11, 2018 #76

    minh-thanh

    minh-thanh

    minh-thanh

    Well-Known Member

    Joined:
    Dec 29, 2016
    Messages:
    510
    Likes Received:
    241
    Location:
    Viet Nam
    Hi all !
    I want to learn more about it and after changing the structure, but keep true - approximate - technical requirements: cylinder diameter, stroke ....
    20180911_230632.jpg 20180911_194736.jpg 20180911_194847.jpg 20180911_230726.jpg
     
  17. Sep 11, 2018 #77

    minh-thanh

    minh-thanh

    minh-thanh

    Well-Known Member

    Joined:
    Dec 29, 2016
    Messages:
    510
    Likes Received:
    241
    Location:
    Viet Nam
    and Video :
     
    Buchanan and Cogsy like this.
  18. Sep 12, 2018 #78

    Keith whiddett

    Keith whiddett

    Keith whiddett

    Member

    Joined:
    May 30, 2018
    Messages:
    21
    Likes Received:
    13
    Gender:
    Male
    Looks good but it running slow. Is there a reason for that, running in??
     
  19. Sep 13, 2018 #79

    minh-thanh

    minh-thanh

    minh-thanh

    Well-Known Member

    Joined:
    Dec 29, 2016
    Messages:
    510
    Likes Received:
    241
    Location:
    Viet Nam
    It's running slow because I'm adjust it slow :D , If I adjust it too fast it will turn the needle - because the needle is not tightened
     
  20. Sep 13, 2018 #80

    lohring

    lohring

    lohring

    Well-Known Member

    Joined:
    Aug 7, 2011
    Messages:
    314
    Likes Received:
    102
    If you are interested, I've written a series of articles on two stroke engines. The first series is in 4 parts on High Power Two Stroke Design:

    http://namba.com/content/library/propwash/2012/November/#/14/
    http://namba.com/content/library/propwash/2013/March/#/3/
    http://namba.com/content/library/propwash/2013/October/#/8/
    http://namba.com/content/library/propwash/2014/October/#/7/

    The second series is just starting on the history, design , and building of model racing two strokes. The first article is at http://namba.com/content/library/propwash/2018/october/14/ and it discusses the history of the nitro engine. The following articles will go into the details of building high power model glow engines.

    Lohring Miller
     
    James6605 likes this.

Share This Page